Sexual intercourse demonstration class

This happened when I was in my third year of vocational nursing school.

That June, after graduation exams, I was bored at school and went to see my first-year homeroom teacher, Ms. Chen.

Ms. Chen had always been very kind to me, and I was very grateful to her.

I sat in Ms. Chen's office for a while, casually chatting about the past. Our conversation drifted to her recent anatomy class. She mentioned that her class was all girls, and they were struggling academically. She asked if I could help tutor the younger girls, and of course, I said no problem. Ms. Chen was my favorite teacher and the most beautiful teacher in the school. It

was my duty to help such a beautiful teacher.

At the time, Ms. Chen was about thirty-four or thirty-five years old. Although she was married, she was still very beautiful.

When she taught our class, I was the class monitor, and she never hid her favoritism towards me, which even aroused the jealousy of many boys in the class. Unfortunately, she only taught me for two years. In the third year, a male teacher took over, and Ms. Chen returned to teach the first-year class she was currently teaching.

I asked, "What do you need me to do?" Ms. Chen smiled and said, "Just give a demonstration for the younger students."

"Give a demonstration? What kind of demonstration?" I didn't remember ever having a human body demonstration class! Ms. Chen smiled and said we'd find out later. Seeing that she didn't want to say more, I didn't ask any more questions.

Teacher Chen also asked me to invite my mother over, saying she could treat us to dinner after class as a thank you for my help.

I didn't want Teacher Chen to treat me, but then I thought, wouldn't this be a good opportunity to strengthen my relationship with her? And I could also return the favor! So I agreed.

My mother's name is Huang Meilian, she's a doctor, 38 years old at the time, 1.68 meters tall, with measurements of 35-24-36—a classic model figure.

I was 18 years old then, 1.78 meters tall, weighing 69 kilograms, with a handsome appearance, a universally acknowledged good-looking man.

The next morning, my mother and I went to Teacher Chen's office.

Her office, though small, was her own private space. The furnishings, though simple, were very clean.

"Hello, Ms. Chen! This is my mother,"

I introduced them. Ms. Chen noticed my mother's measurements: 35-24-36, a standard model figure.

I was eighteen then, 1.78 meters tall, weighing 69 kilograms, with a handsome appearance—a universally acknowledged good-looking man.

The next morning, my mother and I went to Ms. Chen's office.

Her office, though small, was her own private space. The furnishings, though simple, were very clean.

"Hello, Ms. Chen! This is my mother."

I introduced them to each other. Ms. Chen looked at my mother and couldn't help but praise, "Li, your mother is truly a beauty!" My mother smiled slightly and said, "Ms. Chen is very beautiful too!" Ms. Chen made tea for us and said, "Please wait a moment, this class isn't over yet. My anatomy class is next."

So my mother and I drank tea and chatted, and soon it was time for class to end. The classroom next door suddenly became lively, and several girls came to the door of Ms. Chen's office and peeked inside.

"What are you looking at? Don't you know that's very impolite?" Ms. Chen scolded with a stern face.

A girl stuck out her tongue and said, "Didn't the teacher announce that the next class would be a nude demonstration? We'd like to see the nude model first."

Teacher Chen chuckled, "Alright, you've seen it, are you satisfied?" The girl asked with a smile, "Teacher, there are two people here, which one is today's nude model?" "You're all girls, so the nude model the teacher invited is of course a man!" Just then, the bell rang, and the girls all rushed back to the classroom.

Teacher Chen also stood up and said to my mother and me, "Please come with me."

The classroom was next door.

When we followed Teacher Chen into the classroom, there were already more than thirty girls sitting inside; there wasn't a single boy in the entire class.

Ms. Chen asked my mother to sit down on a chair, and then asked me to stand in front of the podium.

"Classmates, today we are fortunate to have Li Xiaoming, a senior student, as our human model. Later, you can learn about the differences between men and women by observing the male body."

The thirty-odd female students in the audience applauded.

I suddenly felt something was wrong, but it was too late to regret it.

"Li, please take off your clothes."

Ms. Chen nodded to me.

I reluctantly took off the only thing I was wearing, a sweatshirt, revealing my fairly muscular chest.

"Please take off your pants as well."

I glanced at Ms. Chen, who was looking at me resolutely, so I had no choice but to take off my sweatpants as well.

"And take off these briefs too,"

Teacher Chen continued.

If I took them off again, I'd be completely naked! Standing naked on the podium in front of so many female students—was this what Teacher Chen meant by "human body demonstration"? Embarrassed, I took off my only pair of underwear and covered my private parts with my hands.

All thirty-odd pairs of eyes were fixed on me. This was the first time in my life I'd been completely naked in front of women, and more than thirty at once.

"For a comparative teaching method with the male body, I'd like to invite another female student to come up and demonstrate the female form.

Who would like to come up?" Teacher Chen looked around, but not a single girl responded.

"Since no student is willing to come up, I'd like to invite Ms. Li to the stage to demonstrate the feminine aspect for us. Is that alright, Ms. Li?" As I looked at Teacher Chen in surprise, my mother stood up from her seat and walked shyly to the front of the stage, asking, "Teacher Chen, do I have to take my clothes off too?" Teacher Chen nodded and said, "Yes, Ms. Li, do you agree?" My mother hesitated for a moment, and I... I knew she would never agree, but to my surprise, my mother looked at Teacher Chen and said, "Alright, for the sake of the students' learning, I'm willing to be a female role model."

With that, she took off her skirt, revealing a blue floral lace lingerie set underneath. The lingerie was very sexy; except for a small piece of fabric embroidered with flowers in the front, it was almost entirely transparent.

My mother seemed to have made up her mind; she unceremoniously took off her lingerie and stood confidently beside me.

It was the first time I had ever seen my mother naked, and I was amazed at how well she had maintained her figure! Her breasts were large and firm, her abdomen smooth and toned, her legs long and slender, and her buttocks slightly upturned. Wearing five-centimeter-high orange-red heels, she appeared exceptionally tall and beautiful.

"Class, now you have a male and a female figure standing before you. I'd like to ask one of you to tell me the difference between them,"

Teacher Chen said, lightly tapping my hand covering my lower body with her pointer.

I awkwardly placed my hands behind my back, my penis limp and dangling from nervousness, looking somewhat comical.

Several students raised their hands.

"Hu Yumei, please tell us," Teacher

Chen said, pointing to a girl wearing glasses in the front row.

"Men have prominent Adam's apples while women don't, and women have full breasts while men don't,"

the student said.

"Anything else?" Teacher Chen asked.

"This~" Hu's face suddenly flushed red, and she shook her head and sat down.

"Wang Yingying, what other differences do you think there are between male and female bodies?" Teacher Chen asked, pointing to another girl.

This time, Wang was the boldest girl who had stood at the door of Teacher Chen's office when class ended. She was of medium height, with a pair of bright, large eyes, and looked very pretty.

"The biggest difference between men and women is their genitals," Wang said in a clear voice. "The male genitals have a protruding penis, while the female genitals are an opening that isn't visible from the outside.

Also, men have a scrotum, while women don't."

Teacher Chen said approvingly, "Wang's analysis is very correct.

That's right, the male external genitalia consist of a penis and a scrotum," Teacher Chen continued teaching. Pointing to the corresponding part of my lower body, he explained, "As for women, their external genitalia are quite private.

Ms. Li, could you please sit on the platform and show the students your external genitalia?" "Sure,"

my mother readily agreed. She sat on the platform, her high-heeled feet resting on the edge, her legs spread in an M shape, completely displaying her most private parts to the entire class.

"Students, please look. The female external genitalia consist of the mons pubis, labia majora and minora, and vagina.

Here, I want to remind you that there are three distinct orifices of flesh in a woman's lower body,"

Teacher Chen explained to the mother. "Look, the smaller orifice at the top is called the urethra, which is the passage for urination. Some couples lack necessary sexual knowledge and often mistake the urethra for the vagina, which can easily cause harm to the woman.

Below that is a larger orifice, which is the vagina, used for sexual intercourse and also the birth canal.

The smaller, tightly closed orifice at the bottom is called the anus, which is generally used for defecation."

"Teacher Chen, what do you mean by 'generally'? Does that mean the anus isn't just for defecation?" a student asked.

"That's right. Some sexual acts involve using the anus for intercourse, which is a very lewd and obscene act that only a shameless woman would do,"

Teacher Chen explained.

"So, how do men have sexual intercourse with women?" This time, it was the mischievous student, Wang, who asked the question.

"Although this isn't the question we'll be addressing in today's lesson, it's still very important knowledge for you all. So, how about I ask Ms. Li to demonstrate intercourse for you all?" Teacher Chen's decision was met with unanimous applause from the entire class.

"Ms. Li, is there a problem?" "No," the mother shook her head, "but how should I demonstrate?" Teacher Chen walked to the mother's side and said, "It's actually very simple. For example, the pointer in my hand is a male penis. You see, inserting a penis into the vagina like this is sexual intercourse."

As Teacher Chen explained, she carefully inserted the pointer into the mother's vagina.

"Teacher Chen, your pointer is so hard, of course it can go in, but Li's penis is limp, how can it go in?" It was Wang who spoke again.

"Good, Wang's observation is very detailed.

Therefore, in order to make the male's penis fully erect before intercourse, foreplay is needed, such as kissing, caressing, and oral sex."

Teacher Chen walked to my side, reached out and grasped my penis, gently stroking it a few times, and then said, "Look, isn't Li's penis a bit bigger than before?" I didn't expect that the most beautiful teacher in the whole school would actually help me masturbate. Stimulated by this, my penis naturally reacted.

"Now, students, please come up and touch Li's penis to experience firsthand how to help a man's penis achieve a full erection."

I could hardly believe that Teacher Chen was going to have all the girls come up and touch my penis. I looked at my mother, a little bewildered. She remained sitting naked on the platform

, smiling at me without saying a word. "Please line up and come up one by one in an orderly fashion. Please don't touch it too hard; a man's penis can be quite fragile sometimes,"

Teacher Chen instructed.

So, all thirty-odd female students lined up in front of me. The first girl to come up was Hu. She touched my penis shyly and quickly withdrew her hand, causing the girls behind her to burst into laughter.

The next few girls came up, much bolder. They imitated Teacher Chen, gently stroking my penis, and one even touched my scrotum.

Then came the boldest one, Wang.

She first used her gloved hand to stroke my penis a few times, then touched my scrotum. Just when I thought it was over, she squatted down and took my penis in her mouth, sucking on it a few times.

I stared at her in shock, then at Teacher Chen. The teacher didn't say a word of reprimand; it seemed she didn't object to Wang's bold actions.

I thought helplessly: How tragic that my virginity would be destroyed by a girl's mouth! The next group of girls, some timid, only touched me briefly before turning away, while others, bolder ones, followed Wang's example and took my penis in their mouths to suckle. With so many girls constantly stimulating me, my penis quickly became very hard, the glans almost touching my stomach.

"Alright, students, look, Li's penis is fully erect after the foreplay. That's the purpose of foreplay.

Actually, besides caressing and oral sex, kissing is also very important for foreplay in male-female intercourse.

Now, I'll demonstrate kissing."

Teacher Chen walked up to me and said, "Li, have you ever kissed before?" I shook my head to indicate no.

"Then let me guide you! Please open your mouth," Teacher Chen brought her mouth close to mine, then slipped her tongue into mine.

To be honest, this was my first kiss.

I was surprised to find that kissing could be so fun.

I sucked on her tongue, then put my own tongue into her mouth.

The kiss lasted for about three minutes before she asked, "Now, is it safe for Li's penis to be inserted into her vagina?" "Teacher Chen, could Li demonstrate insertion?" Needless to say, it was the mischievous Wang who spoke.

"Although such a demonstration may inevitably have a pornographic element, it's important for teenagers to have proper sex education. Could Ms. Li agree to demonstrate sexual intercourse with Li, giving the other students a chance to witness it firsthand and learn how to have sex with the opposite sex?" Did Teacher Chen really want my mother and me to perform this incestuous sexual intercourse demonstration in front of more than thirty female students? I was so shocked that my mouth dropped open and I couldn't close it for a moment.

What surprised me even more was my mother's attitude. She nodded without hesitation and said, "As long as it can help these students, there's nothing wrong with me giving this demonstration."

"Since Li's mother agrees to give a sexual intercourse demonstration, then Li, please come over here," Teacher Chen gestured for me to walk to the front of the podium. "Students, in order to observe more clearly, you can come to the edge of the podium, but please do not disturb Li and his mother's sexual intercourse."

So all thirty-odd female classmates gathered around.

I was both excited and nervous. Was I really going to have sex with my mother in front of so many girls? I gripped the base of my penis with my right hand, the head pointing towards my mother's vagina, but I didn't dare to insert it.

Teacher Chen gently pushed me from behind, so I thrust forward, the head of my penis touching my mother's clitoris.

My mother let out a soft "oh," and slightly adjusted her position, and my penis entered my mother's vagina.

"Wow! It's in!" several female classmates exclaimed.

"Good," Teacher Chen explained, "This is sexual intercourse.

Li's penis has successfully entered Li's mother's vagina. Of course, this kind of insertion requires the woman's vagina to be fully lubricated, otherwise the woman's vagina may feel uncomfortable due to injury."

"So how can it be fully lubricated?" a girl asked.

"Men can lubricate women's vaginas by caressing them, or even by giving them oral sex.

Li, try giving your mother oral sex!" I looked at my mother, and she nodded at me with a rosy face.

So I pulled out my penis, squatted down slightly, and licked my mother's vaginal opening a few times with my tongue.

Teacher Chen smiled and said, "It seems that Li hasn't mastered the technique of oral sex yet.

You can first lick your mother's labia majora and minora back and forth, and then use the tip of your tongue to tease her clitoris. The clitoris is the most sensitive female genital organ."

I did as Teacher Chen taught me, and my mother indeed cried out excitedly.

"Teacher Chen, what does Li's mother's 'ah' sound mean?" Wang asked again.

"This means that Mom Li is sexually aroused, which usually means she's moaning.

Look, there's already some vaginal fluid coming out of Mom Li's vagina, right?" "Really! Mom Li is getting a lot of vaginal fluid!" "Teacher Chen, Mom Li's vaginal opening seems to be wriggling!" "You students observed very carefully! This wriggling means that Mom Li wants penetration.

Li, try inserting your tongue."

So I inserted my tongue into Mom's vagina and moved it in and out.

Mom quickly let out moaning sounds again.

"How do you feel?" Teacher Chen asked me.

"Teacher Chen, Mom's vagina seems wet and slippery inside, and there seems to be water seeping out from the vaginal walls!" "That's right," Teacher Chen said, "This fully demonstrates that your mother urgently needs your penis to penetrate her and have sex with her.

Li, now insert your penis into Mom's vagina and thrust back and forth."

I followed Teacher Chen's instructions and began to have sex with my mother.

"Teacher Chen, Li's penis doesn't seem to be fully inserted yet!" This time, I don't know who asked such an explosive question.

"Very good question!" Teacher Chen explained. "Li's penis is estimated to be nine inches long, while Li's mother's vagina is probably no more than seven inches deep. Therefore, Li's penis can only go in this far; any further and it will penetrate his mother's uterus."

"Isn't that okay?" asked the same girl from before.

"It's not that it's impossible, but our sex demonstration today doesn't require penetration into the uterus.

Li's mother, could you let your son have sex with you in your uterus?" "Yes, I can!" the mother nodded.

"Li, try inserting it again!" Teacher Chen said.

I slowly inserted my penis again, the head of my penis quickly hitting a soft spot. My mother let out a soft moan, her lower body trembling slightly.

I knew the head of my penis had reached the opening of my mother's cervix.

I looked at my mother, unsure whether to continue.

My mother smiled slightly at me, her face flushed, and said, "Don't move, let me do it!" So my mother slightly lifted her lower body, and I felt the head of my penis push through that soft flesh and enter my mother's uterus.

"Wow! It's all the way in!" "Mother Li's vagina is really amazing! I wonder if I could do it!" Several girls chattered excitedly.

"Alright, Li and his mother have successfully demonstrated intercourse with penetration into the uterus. It was a very successful demonstration. Do you have any questions?" Teacher Chen continued.

"Teacher Chen," Wang stepped forward again, "didn't you say that the anus can also be used for sexual intercourse? Could you ask Li and his mother to demonstrate for us?" "This class is about to end," Teacher Chen said, "Ms. Li, could you demonstrate anal intercourse again next class?" The mother nodded and said, "As long as it helps the students' learning, I'm happy to help."

"Okay, Li, you can pull your penis out now.

That's all for this class. Students can discuss any questions next time."

I reluctantly pulled out my penis, and at that moment, due to the prolonged erection and various physical and mental stimulation, I couldn't hold back any longer and ejaculated! A stream of milky, viscous semen shot out from the tip of my penis. Just as my glans left my mother's vaginal opening, most of the semen landed at the entrance, with some splashing onto her stomach.

Ms. Chen was stunned by the unexpected ejaculation. The other students stared at me blankly, as if I were a monster. My mother, her face flushed, looked at me silently.

"Ms. Chen, is this ejaculation?" a female student whispered.

"That's right, that's ejaculation," Ms. Chen seemed a little dazed. She dipped her hand in some semen and said, "Such a little semen can conceive many children.

Students, if you want to enjoy the pleasure of sex without hurting yourselves, you must take effective contraceptive measures. Next class, I'll teach you how to use condoms."

I stood incredibly embarrassed in front of the podium until someone handed me a pack of tissues, which brought me back to my senses.

"Thank you!" I said.

It was that mischievous student, Wang! She looked at me sympathetically and said, "It's not your fault. Unless you're not a normal man, who can guarantee they won't ejaculate?" I thanked her again and began wiping the semen from my mother's vaginal opening, then from her stomach.

My mother obediently let me wipe her clean until it was all gone. Only then did she close her legs and get off the platform to put her underwear and skirt back on.

I was surprised to find my mother so beautiful and sexy, and at the same time, I was glad I could have sex with her.

I even started looking forward to the next sex demonstration.

Yes, I looked forward to having sex with my mother again! This extremely lewd sex demonstration ended just like that. The hotel where Teacher Chen treated us to lunch was not far from the health school. Although it wasn't a luxurious hotel, the decor was unique. The private rooms weren't large, but they had a very romantic atmosphere, perfect for small gatherings of three to five people. The health school's male and female students often dined here for their rendezvous.

"Mother Li, student Li, please order whatever you like, don't be shy,"

Teacher Chen said, taking the menu from the hotel waiter after we were all seated. The private room had been booked in advance by Teacher Chen.

Ms. Chen, who had been wearing a professional outfit in class, had changed into a white tank top with an orange vest over it, and an orange floral skirt, looking quite vibrant.

"Ms. Chen, please don't be so polite. Xiaoming and I are very casual about meals."

"Then let's each order one dish!" Ms. Chen said, handing over the menu.

My mother took the menu and looked at it. She ordered scallion ribs, I ordered a double-flavored fish head, and Ms. Chen then ordered stir-fried river shrimp, stir-fried water spinach, and a bowl of mushroom and turtle soup.

"What kind of wine do you like to drink?" Ms. Chen asked.

My mother quickly shook her head and said, "I don't usually drink much."

Knowing her usual preferences, I said, "Have some beer!" So Teacher Chen ordered three more bottles of beer.

After all the dishes were served, Teacher Chen instructed the waitress to wait outside and specifically told her not to come in casually.

"Mrs. Li, thank you so much today!" Teacher Chen stood up and ladled a bowl of soup for my mother.

"You're too kind, Teacher Chen."

Teacher Chen was about to ladle some soup for me, but I quickly took the ladle from her hand, ladled a bowl of soup for Teacher Chen first, and then ladled one for myself as well.

"Mmm, this soup tastes really good!" My mother said after taking a sip of soup.

"The most special dish here must be this mushroom and turtle soup," Teacher Chen said, raising his glass to suggest we all have a drink.

"There wasn't supposed to be a sex demonstration in today's class; it was a last-minute request from the students. I didn't expect Li's mother to agree so readily. I'm truly grateful!" "It's just a small thing, yet it's such a hassle

for you, teacher. Actually, it's my honor to be able to help the students."

Teacher Chen and the mother exchanged pleasantries and toasted each other.

Then, Teacher Chen raised his glass to me, saying, "Li, thank you too today! Your performance was excellent."

"You flatter me, teacher!" Teacher Chen and I also toasted each other.

"Li, may I ask you a question? You don't have to answer," Teacher

Chen said, looking into my eyes. "Was your sex demonstration with your mother today your first time?" I was stunned, not expecting Teacher Chen to ask such a private question. I looked to my mother for help, and she smiled and said, "Xiaoming, just tell the truth. Mom is also very curious."

I said, "Teacher Chen, does masturbation count?" Teacher Chen and my mother both laughed.

Teacher Chen said with a smile, "Masturbation doesn't count."

"Then that's it,"

I said honestly.

"So, your sexual demonstration with your mother was your first time? Li's mother, your son's..." "I believe that since sexual intercourse is a pleasurable experience, there shouldn't be so many taboos. As long as both parties are willing and it doesn't affect family harmony, it's fine to do it."

"So, Teacher Chen approves of mother-son sexual intercourse?" "Whether you approve or not, you need to give a reason.

The son's body is conceived and grows in the mother's womb, and then comes into this world through the mother's vagina. A part of the son's body returns to the mother's body to create pleasure. What's wrong with that?" Teacher Chen's words surprised me greatly; I never expected her to have such open-minded thoughts! I sat to the side listening to Teacher Chen and my mother's conversation, unable to get a word in edgewise.

"If Teacher Chen had a son, would you have sex with him?" "It's a pity I had a daughter, which is why I envy Mother Li!" Teacher Chen then asked the mother, "Mother Li, would you have sex with your son?" The mother glanced at me and said, "It depends on the situation. If it's like today, and my son doesn't object, I would."

Teacher Chen then asked me, "Student Li, would you have sex with your mother?" I looked at my mother, and she was looking at me gently.

I replied, "I'm willing too." Teacher Chen said, "It's clear that you and your son are of one mind! This was also proven in class today.

Li's mother, when your son penetrated you, your vagina was fully lubricated, which proves that you were expecting him to penetrate you.

And Li's son ejaculated at the end, which proves that he enjoys having sex with his mother.

Li's mother, how is your sex life with your husband?" "Well... actually, my husband got prostatitis two years ago, and we haven't had sex much in the past two years." "

I see! Women who lack the nourishment of sex life will age very quickly! Li's son, your mother's sexual happiness will depend on you from now on!" My mother blushed and said, "Teacher Chen, please don't say that. He's still just a student, and he's not even an adult yet."

"Mrs. Li, although your son is not yet of legal age, his body is already very well developed, isn't it? To be honest, even when my husband was at his best, his penis wasn't as big as his."

The mother said, "That's true, my husband's penis isn't as big as his either.

Teacher Chen, how is your sex life?" "To be honest, my situation is similar to yours in terms of sex life.

My husband is often away on business trips abroad, and when he comes back, we rarely have sex."

"Have you ever thought about having an affair, Mr. Chen?" "I'm a teacher, and I'm not the kind of person who's casual about sex.

What about you, Mrs. Li?" "Although my husband isn't in the best of health, he loves me very much, and I have a lovely son. I cherish my family's happiness!" Mr. Chen nodded and said, "I can see that Mrs. Li cares a lot about her husband and son.

But if it were to have sex with your son, and your husband didn't object, would you do it?" "Maybe... I would."

The mother blushed again as she spoke.

The three bottles of beer were quickly finished. Teacher Chen asked, "Would you like three more?" "Teacher Chen, you can't drink anymore,"

Mom quickly stopped me. "You have to go to work this afternoon, and Xiaoming isn't an adult yet; he can't drink too much."

"That's what I thought too. Let's eat then!" Teacher Chen said.

I quickly got up and served Teacher Chen and Mom each a bowl of rice.

"Mrs. Li, next time I teach a sex demonstration class, I want to teach the students more sexual positions and how to properly use condoms. Would you be willing to accept the invitation?" I was eagerly awaiting my mother's approval.

Mom thought for a moment, looked at me again, and then nodded, saying, "I feel very honored as long as I can help my classmates."

Teacher Chen smiled and said, "Ms. Li, that's so kind of you! Could we do some pre-reading now?" "What? Here?" "Yes, right here."

Mom's face flushed red. She said, "Well... if Teacher Chen would like to give a demonstration first, I can do some pre-reading too."

Ms. Chen glanced at me, then smiled and said, "Is Ms. Li comfortable with me having sexual contact with Li?" "Ms. Chen is old enough to be my son's mother, what do I have to worry about?" Ms. Chen nodded, then turned to me and said, "Will Li think I'm too old?" I never dreamed I could have sex with the most beautiful teacher in the whole school, this is truly unexpected! But I was afraid that if I was too enthusiastic, my mother would be unhappy, so I looked at her and asked, "Mom, is it okay?" My mother nodded and said, "Xiaoming, you didn't do very well this morning. Now, when you're with the teacher, you have to behave well!" As soon as my mother said this, Teacher Chen called me over to her side. She first took off my pants, and then started taking off her own skirt.

Soon, our lower bodies were completely naked.

"Mother Li, look how big your son's penis is!" Teacher Chen said, reaching out and grasping my penis.

"What does Teacher Chen plan to do?" my mother asked, walking up to us. Her gaze lingered on my penis.

Ms. Chen gestured for me to sit in the chair. Then, facing my mother with her back to me, she held my penis in her left hand and gently sat down, parting her labia majora and minora with her right. My glans slid into a warm, moist passage.

My mother looked down and asked, "Ms. Chen, is it in?" "Look, it's all in! Your son's penis is so long, the glans is even touching my uterus."

My mother laughed and said, "I already felt it in class today. Ms. Chen, does it feel good?" "Mrs. Li, we're demonstrating sex right now, whether it feels good or not isn't that important, is it?" My mother blushed and said, "Ms. Chen

is right."

The teacher, bobbing his body up and down, said, "But to be honest, young men's penises are different, so big and hard, it feels really good inside them!" Mom chuckled, "Teacher Chen, can you feel pleasure during a sex demonstration?" "A sex demonstration is sex too! This morning in class, your son's penis was inside you, didn't you feel pleasure too? And you made such lewd moans!" Mom blushed and didn't speak.

Teacher Chen played with him for a while, then stopped.

"Student Li, now let your mother come up and have sex with you, and I'll be your guide."

Teacher Chen pulled off me.

"Why isn't Li's mom taking off her skirt? Do you want your son to help you take it off?" Mom quickly said no, and took off her skirt and underwear herself, exposing her entire lower body.

Mom walked up to me and used the same sexual position that Teacher Chen and I had just done to insert my penis. She sometimes moved up and down, sometimes swayed from side to side. Mom's vagina was a little looser than Teacher Chen's, and there was more fluid inside.

"Li, the position your mom is doing with you now is called 'Guanyin Sitting on a Lotus.'

You can put your hands inside Mom's clothes and caress her breasts."

I tentatively put my hands inside, and seeing that Mom didn't object, I boldly started playing with her breasts.

However, my clothes were in the way, and I thought to myself: "If only Mom would take her clothes off too."

As if hearing my thoughts, Teacher Chen said, "Mother Li, please take your clothes off as well. It will make it easier for your son to caress you."

Mom hummed in agreement, sat on my penis, and took off all her clothes, leaving her completely naked.

I happily kneaded and squeezed her breasts.

"Mother Li, isn't it great to caress and have sex at the same time?" Teacher Chen asked.

Mom nodded without saying a word.

"Now turn around and have sex with your son in the same position!" Teacher Chen said.

My mother obediently turned around, still sitting on my penis, facing me.

"That's right, just like that," Teacher Chen continued explaining, "This position is called 'Old Tree Roots.'

Li, you can suck on your mother's nipples and caress her buttocks with your hands."

So I did as Teacher Chen said.

My mother quickly let out a lewd moan, her eyes slightly closed, looking ecstatic, and her lower body moved even faster.

Teacher Chen quickly said, "Stop."

My mother opened her eyes and looked at Teacher Chen in confusion.

"Mother Li, you can't reach orgasm yet, you know? There are still many sexual positions to try."

Then Teacher Chen told my mother to get off me, put her hands on the chair, and let me fuck her from behind.

"This position is called 'riding archery,' also known as 'doggy style.'

In this position, the man can insert his penis very deeply."

I fucked my mother from behind, and having sex in this position gave me a sense of conquest, as if my mother had become a mare under my crotch.

Unfortunately, after only a few dozen thrusts, Teacher Chen told me to stop, which made me very unhappy.

Next, under Teacher Chen's guidance, my mother and I tried five or six different sexual positions.

The most interesting one for me was standing face-to-face with my mother.

I'm ten centimeters taller than her, and with my penis inside her vagina, the head of my penis naturally penetrated her uterus when I stood up straight.

Teacher Chen had us dance while having sex.

My mother's dance was very graceful. I'm not usually good at dancing, but with my mother's encouragement, I actually danced quite well.

This sexual position was incredibly lewd, and I quickly ejaculated under intense stimulation.

"Oh, Mom~" My semen shot directly into my mother's uterus, then flowed out of her vagina and dripped onto the ground.

I gasped for breath, the intense orgasm leaving me feeling exhausted.

"Xiaoming, my good son."

My mother hugged me tightly, stroking my face and buttocks with her hands. "Teacher Chen, my son has ejaculated, can we stop now?" "Ah, Li's mother, I want to congratulate you! This is Li's virgin semen! Now you two separate," Teacher Chen separated my mother and me, then reached down to collect some semen from my mother's genitals, saying, "You've ejaculated so much, this semen can help you have many children." "Where's the semen?"

Mom looked at the semen in Teacher Chen's palm, her face flushed with embarrassment. She said, "Teacher Chen, I didn't expect him to ejaculate so quickly!" Teacher Chen smiled and said, "Yes, it's a pity that Li's mother didn't even reach orgasm before he ejaculated! Li, you have to work hard in the next sex demonstration class. It's a man's responsibility to satisfy his sexual partner, do you understand?" After that, Mom, Teacher Chen, and I got dressed and sat down again to eat.

After the sex demonstration, my sex skills improved again.

Although I've watched a lot of porn, watching others have sex and experiencing it yourself are completely different things. Sex requires practical experience! And so, my mother and I ended this extremely lewd sex preparatory class.

My only regret was that I hadn't brought my mother to orgasm.

Back home, I tried to break down the barriers between my mother and me.

But I quickly found it wouldn't work.

Every time I tried to get close to my mother, she would stop me with an unwavering gaze. I felt extremely frustrated and could only look forward to the next sex demonstration class.

A week later, Teacher Chen invited my mother and me again.

We arrived at her office. This time, instead of asking me to change in another room, she led my mother and me directly to the classroom next door.

The moment we entered, the female students in the classroom clapped in unison, seemingly also looking forward to this sex demonstration lesson.

Ms. Chen walked to the podium and announced to the class, "Today we will learn two things: one is how to correctly use a condom, which is very important for you; the other is the common sexual positions.

To make it easier for you to observe, I would like you to move your desks around."

So all the female students moved their desks to the perimeter of the classroom.

Ms. Chen then asked my mother and me to walk to the open space in the center of the classroom.

"Ms. Li, Li, you can take off your clothes now,"

said Teacher Chen.

We quickly took off all our clothes.

Although this was the second time I had shown my naked body in front of so many female students, I was still a little uncomfortable. My mother seemed more at ease than me.

"Now we'll learn how to use a condom correctly,"

Teacher Chen said, taking a small plastic bag from her pocket. She gently tore open the bag and showed the contents to the students, saying, "Look, this is a condom.

Does anyone know how to put on a condom?" At this moment, a female student stood up and said, "Can I try?" It was the somewhat shy Wang who spoke.

Ms. Chen said, "That's fine."

Wang took the condom from Ms. Chen and walked over to me. She put the opening of the condom on my glans and then gently stroked it down.

Since my penis was already erect, she quickly put the condom on for me.

"Teacher, did I do it right?" Teacher Chen nodded and said, "You've done very well. However, the man's penis should be fully lubricated before putting on the condom, otherwise the man will lose his libido due to pain.

Li's mother, could you please demonstrate for the students?" The mother nodded and said, "Okay."

So the mother walked up to me. Unlike Wang, who was bending over, she squatted down in front of me. She gently took off the condom for me, then opened her mouth and sucked on my penis a few times before spitting it out and putting the condom back on for me.

"Did you all see that?" Teacher Chen said. "Mother Li's demonstration was very good.

Of course, there are many ways to make the penis wet, and oral sex is just one of them."

At this moment, a student asked, "Teacher Chen, are there any other ways to put on a condom?" Teacher Chen replied, "Good question. Actually, you can also put on a condom for a man with your mouth.

Does Mother Li know how?" The mother shook her head and said, "No."

"Alright, now I'll demonstrate how to put on a condom with my mouth."

Ms. Chen, like a mother, knelt down in front of me. She took off the condom, licked my penis for a while with her tongue, then sucked on it. "Class, now Li's penis is fully lubricated. Now, pay close attention to how I put on a condom with my mouth."

After saying this, Ms. Chen put the condom in her mouth, leaving the opening outside, pressing it against my glans. She slowly swallowed my penis, and when she released it, the condom was on.

A burst of enthusiastic applause erupted in the classroom.

Next was condom-wearing intercourse.

Ms. Chen gestured for me to lie down on the classroom floor. Because the floor was cold, she suggested using the clothes my mother and I had taken off as a cushion.

After I lay down, Ms. Chen nodded to my mother, who didn't hesitate. She straddled me with one leg, slowly squatted down, grasped the base of my penis with one hand, and gently stroked it a few times. With her other hand, she spread her labia majora and minora, brought her vaginal opening to my glans, and gently sat down.

All the girls in the class gathered around, watching intently, some whispering amongst themselves.

"It really went in."

"Won't wearing a condom affect the pleasure?" Teacher Chen had clearly heard their discussion. She smiled and said, "Wearing a condom will certainly affect the pleasure, but it's still very necessary to ensure safety.

If you don't want to have children, you must insist that your partner wear a condom when you have sex."

"But you can also take birth control pills!" The one who spoke was Wang.

"Medicine is three parts poison, you understand?" Teacher Chen said in a somewhat serious tone, "Taking too many pills is very bad for your health, especially for teenage girls like you, you should avoid taking pills."

While Teacher Chen was educating the students, my mother sat on my penis looking very embarrassed, not knowing whether to get off or continue sitting.

"Mother Li can get off now,"

the teacher said.

"Next is a demonstration of sexual positions."

After Mom got off me, Teacher Chen removed the condom from my penis and said, "Class, Li's mother has an IUD, so we won't need to wear a condom for the following sexual demonstration. Therefore, you can see the intimate contact between their genitals.

Please observe carefully later, and feel free to ask any questions."

At this moment, student Wang suddenly spoke up: "Teacher Chen, why did you have to choose Li's mother as Li's sexual partner? Isn't incest between mother and son the biggest taboo of incest?" I saw Mom's face turn bright red.

"Wang, you need to understand that what we're doing now is a teaching demonstration, not actual sexual intercourse.

Since Li is still a minor, the teacher needs his parents' consent to have him demonstrate. If we don't invite Li's mother to be her son's sexual partner, then who should we invite?" "Teacher Chen is fine too!" The mother's consent was good, and besides, the teacher would also have to act as a lecturer, which would be inconvenient.

Originally, the teacher wanted to hire a prostitute, but was afraid Li's mother wouldn't agree.

Teacher Chen nodded to the mother and continued, "Actually, a son's body comes from his mother's vagina. What's wrong with a son teaching his son how to have sex using the vagina that gave him birth?" "Then what constitutes incest between mother and son?" someone asked.

"Incest is defined as unnatural sexual behavior between a mother and son."

"Then what constitutes unnatural sexual behavior?" The same student asked again.

Teacher Chen pondered for a moment and said, "For example, incest between a mother and son behind the father's back, or incest between a mother and son resulting in a child of incestuous generation."

"Does Teacher Chen mean that as long as you don't have children and don't do it behind your family's back, it's not incest?" This time it was that same student, Wang.

Teacher Chen said, "That should be the case."

Student Wang then asked, "Then is it the same for fathers and daughters?" Teacher Chen said seriously, "Sexual activity between fathers and daughters is not as simple as that between mothers and sons.

Because a virgin's hymen is intact before she loses her virginity, if a girl loses her virginity too early, and her future husband cares about her virginity, it could lead to unhappiness in the marriage."

"So, does this mean that mother-son sex only requires the father's consent, while father-daughter sex requires not only the mother's consent but also the husband's? Isn't that unfair?" "There are many unfair things in this world.

Okay, this lesson isn't about ethics.

Next, my mother and I demonstrated several types of sexual intercourse in front of the thirty-odd female students in the class." The teacher demonstrated positions, even anal sex.

To be honest, neither my mother nor I like anal sex. When I forced my penis into my mother's anus, she trembled with pain, which broke my heart.

Near the end of class, Teacher Chen suddenly announced, "Class, how about we have Li and his mother give us a full demonstration of sex?" The classroom erupted in cheers.

I looked at my mother; she was already in position, just waiting for me to fuck her.

I inserted my penis into her from behind. This time, it wasn't a mere demonstration, but a real, full-on penetration.

To increase my mother's sexual stimulation, I thrust my penis in and out while caressing her breasts, thighs, and buttocks with both hands.

My mother quickly became aroused; she couldn't help but moan loudly, and her vagina became increasingly wet, with vaginal fluid constantly seeping from the point of our genitals, wetting the classroom floor.

"Teacher Chen, why is so much fluid coming out of Li's mother's vagina?" a student asked.

Teacher Chen explained, "This is vaginal fluid.

It flows out when a man and woman experience pleasure during intercourse. Its purpose is to prevent damage to the vagina from vigorous thrusting.

Look, Mother Li is on the verge of orgasm."

Suddenly, I felt my mother's vagina convulse violently, and a gush of vaginal fluid sprayed onto my glans. Immediately afterward, my mother's body trembled uncontrollably.

"Ahhh~" my mother let out a lewd sound.

"Class, look! This is a classic orgasm symptom! Li's mom is probably experiencing an orgasm right now; it's the happiest moment for a woman,"

Teacher Chen explained. Then she said to me, "Li, you did a really great job today. It would have been even better if you could ejaculate inside your mom."

Before Teacher Chen finished speaking, I had already started ejaculating.

I held my mom's legs tightly with both hands, and streams of hot semen shot deep into her vagina.

I thrust a few more times and then lay motionless on my mom's back.

"Wow, Li ejaculated!" "Look how much he's sweating!" the female classmates around me exclaimed.

Teacher Chen instructed me to withdraw my penis so that the students could see my mother's vagina, which had been penetrated by semen.

"Look, this milky white liquid is semen.

When Li's father ejaculated inside Li's mother's vagina, it fertilized an egg released from her body, resulting in his birth."

"Would Li have had a child if he ejaculated inside his mother's vagina?" someone asked.

"No," Teacher Chen said, "because Li's mother has an IUD."

Then, my mother squatted down, letting the semen flow out of her vagina, before getting up and dressing.

This long-awaited sex demonstration class ended just like that. I finally got to fuck my own mother's cunt and even ejaculated my incestuous semen inside her vagina.

This happened when I was in my third year of vocational nursing school.

That June, after graduation exams, I was bored at school, so I went to see my first-year homeroom teacher, Ms. Chen.

Ms. Chen had always taken good care of me, and I was very grateful to her.

I sat in Ms. Chen's office for a while, chatting casually about the past. Our conversation drifted to her recent anatomy class. She mentioned that her current class was all girls, and they were struggling to keep up. She asked if I could help tutor her younger female students. Of course, I said no problem, because Ms. Chen was my favorite teacher and the most beautiful teacher in the school. It was only

natural that I would help such a beautiful teacher.

At the time, Ms. Chen was about thirty-four or thirty-five years old. Although she was married, she was still stunningly beautiful.

When she taught our class, I was the class monitor, and she never hid her favoritism towards me, which even aroused the jealousy of many boys in the class. Unfortunately, she only taught me for two years. In the third year, a male teacher took over, and Ms. Chen returned to teach her current first-year class.

I asked, "What do you need me to do?" Ms. Chen smiled and said, "Just give a demonstration for the younger students."

"A demonstration? What kind of demonstration?" I couldn't recall ever having a human anatomy demonstration class! Ms. Chen smiled and said we'd find out later. Seeing she didn't want to elaborate, I didn't ask any more questions.

Ms. Chen also asked me to invite my mother over, saying she could treat us to dinner after class as a thank you for my help.

I didn't want Ms. Chen to treat me, but then I thought, wouldn't this be a good opportunity to strengthen my relationship with her? And I could also return the favor! So I agreed.

My mother's name is Huang Meilian. She's a doctor, thirty-eight years old at the time, 1.68 meters tall, with measurements of 35-24-36—a standard model figure.

I was eighteen then, 1.78 meters tall, weighing 69 kilograms, with a handsome appearance—a universally acknowledged good-looking man.

The next morning, my mother and I went to Professor Chen's office.

Although her office wasn't large, it was her own private space. The furnishings were simple, but very clean.

"Hello, Professor Chen! This is my mother,"

I introduced them. Professor Chen looked at my mother's 35-24-36 figure—a standard model figure.

I was eighteen years old then, 1.78 meters tall, weighing 69 kilograms, with a dignified appearance, and was a universally acknowledged handsome man.

The next morning, my mother and I went to Teacher Chen's office.

Although her office was not large, it was her own room, and although the furnishings were simple, it was very clean.

"Hello, Ms. Chen! This is my mother."

I introduced them to each other. Ms. Chen looked at my mother and couldn't help but praise, "Li, your mother is truly a beauty!" My mother smiled slightly and said, "Ms. Chen is very beautiful too!" Ms. Chen made tea for us and said, "Please wait a moment, this class isn't over yet. My anatomy class is next."

So my mother and I drank tea and chatted, and soon it was time for class to end. The classroom next door suddenly became lively, and several girls came to the door of Ms. Chen's office and peeked inside.

"What are you looking at? Don't you know that's very impolite?" Ms. Chen scolded with a stern face.

A girl stuck out her tongue and said, "Didn't the teacher announce that the next class would be a nude demonstration? We'd like to see a nude model first."

Teacher Chen chuckled, "Alright, you've seen it, are you satisfied?" The girl asked with a smile, "Teacher, there are two people here, which one is today's nude model?" "You're all girls, so the nude model I invited is of course a man!" Just then, the bell rang, and the girls all rushed back to the classroom.

Teacher Chen also stood up and said to my mother and me, "Please come with me."

The classroom was next door.

When we followed Teacher Chen into the classroom, there were already more than thirty girls sitting inside; there wasn't a single boy in the entire class.

Teacher Chen asked my mother to sit down on a chair, and then asked me to stand in front of the podium.

"Classmates, today we are fortunate to have Li Xiaoming, a student from an upper grade, as our human model. Later, you can learn about the differences between men and women by observing the male body."

The more than thirty female students below the stage applauded together.

I suddenly had a bad feeling, but it was too late to regret it now.

"Li, please take off your clothes."

Teacher Chen nodded to me.

I gritted my teeth and took off the only sweatshirt I was wearing, revealing my fairly muscular chest.

"Please take off your pants too."

I glanced at Ms. Chen; she was looking at me resolutely, so I had no choice but to take off my athletic shorts as well.

"And take off these briefs as well,"

Ms. Chen continued.

If I took them off again, wouldn't I be completely naked? Standing naked on the podium in front of so many female classmates—was this what Ms. Chen meant by "human body demonstration"? Embarrassed, I took off my only pair of underwear and covered my private parts with my hands.

All thirty-odd pairs of eyes in the class were staring at me. This was the first time in my life I had been completely naked in front of women, and more than thirty women at once.

"To facilitate comparative teaching with the male body, I'd like to invite another female student to come up and demonstrate the female body.

Which student would like to come up?" Teacher Chen looked around, but no girl responded.

"Since no one is willing to come up, I'd like to invite Ms. Li to come up and demonstrate the female body for us. Is that alright, Ms. Li?" As I looked at Teacher Chen in surprise, my mother stood up from her seat and walked shyly to the front of the stage, asking, "Teacher Chen, do I have to take my clothes off too?" Teacher Chen nodded and said, "Yes, Ms. Li, do you agree?" My mother hesitated for a moment, and I... I knew she would never agree, but to my surprise, my mother looked at Teacher Chen and said, "Alright, for the sake of the students' learning, I'm willing to be a female role model."

With that, she took off her skirt, revealing a blue floral lace lingerie set underneath. The lingerie was very sexy; except for a small piece of fabric embroidered with flowers in the front, it was almost entirely transparent.

My mother seemed to have made up her mind; she unceremoniously took off her lingerie and stood confidently beside me.

It was the first time I had ever seen my mother naked, and I was amazed at how well she had maintained her figure! Her breasts were large and firm, her abdomen smooth and toned, her legs long and slender, and her buttocks slightly upturned. Wearing five-centimeter-high orange-red heels, she appeared exceptionally tall and beautiful.

"Class, now you have a male and a female figure standing before you. I'd like to ask one of you to tell me the difference between them,"

Teacher Chen said, lightly tapping my hand covering my lower body with her pointer.

I awkwardly placed my hands behind my back, my penis limp and dangling from nervousness, looking somewhat comical.

Several students raised their hands.

"Hu Yumei, please tell us," Teacher

Chen said, pointing to a girl wearing glasses in the front row.

"Men have prominent Adam's apples while women don't, and women have full breasts while men don't,"

said student Hu.

"Anything else?" Teacher Chen asked.

"Well..." Student Hu suddenly blushed, shook her head, and sat down.

"Student Wang Yingying, what other differences do you think there are between male and female bodies?" Teacher Chen asked, pointing to another girl.

This time, student Wang was the boldest girl who had stood at the door of Teacher Chen's office earlier after class. She was of medium height, with a pair of bright, large eyes, and looked very pretty.

"The biggest difference between men and women is their genitals," Wang said in a clear voice. "The male genitals have a protruding penis, while the female genitals are an opening that isn't visible from the outside.

Also, men have a scrotum, while women don't."

Teacher Chen said approvingly, "Wang's analysis is very correct.

That's right, the male external genitalia consist of a penis and a scrotum," Teacher Chen continued teaching. Pointing to the corresponding part of my lower body, he explained, "As for women, their external genitalia are quite private.

Ms. Li, could you please sit on the platform and show the students your external genitalia?" "Sure,"

my mother readily agreed. She sat on the platform, her high-heeled feet resting on the edge, her legs spread in an M shape, completely displaying her most private parts to the entire class.

"Students, please look. The female external genitalia consist of the mons pubis, labia majora and minora, and vagina.

Here, I want to remind you that there are three distinct orifices of flesh in a woman's lower body,"

Teacher Chen explained to the mother. "Look, the smaller orifice at the top is called the urethra, which is the passage for urination. Some couples lack necessary sexual knowledge and often mistake the urethra for the vagina, which can easily cause harm to the woman.

Below that is a larger orifice, which is the vagina, used for sexual intercourse and also the birth canal.

The smaller, tightly closed orifice at the bottom is called the anus, which is generally used for defecation."

"Teacher Chen, what do you mean by 'generally'? Does that mean the anus isn't just for defecation?" a student asked.

"That's right. Some sexual acts involve using the anus for intercourse, which is a very lewd and obscene act that only a shameless woman would do,"

Teacher Chen explained.

"So, how do men have sexual intercourse with women?" This time, it was the mischievous student, Wang, who asked the question.

"Although this isn't the question we'll be addressing in today's lesson, it's still very important knowledge for you all. So, how about I ask Ms. Li to demonstrate intercourse for you all?" Teacher Chen's decision was met with unanimous applause from the entire class.

"Ms. Li, is there a problem?" "No," the mother shook her head, "but how should I demonstrate?" Teacher Chen walked to the mother's side and said, "It's actually very simple. For example, the pointer in my hand is a male penis. You see, inserting a penis into the vagina like this is sexual intercourse."

As Teacher Chen explained, she carefully inserted the pointer into the mother's vagina.

"Teacher Chen, your pointer is so hard, of course it can go in, but Li's penis is limp, how can it go in?" It was Wang who spoke again.

"Good, Wang's observation is very detailed.

Therefore, in order to make the male's penis fully erect before intercourse, foreplay is needed, such as kissing, caressing, and oral sex."

Teacher Chen walked to my side, reached out and grasped my penis, gently stroking it a few times, and then said, "Look, isn't Li's penis a bit bigger than before?" I didn't expect that the most beautiful teacher in the whole school would actually help me masturbate. Stimulated by this, my penis naturally reacted.

"Now, students, please come up and touch Li's penis to experience firsthand how to help a man's penis achieve a full erection."

I could hardly believe that Teacher Chen was going to have all the girls come up and touch my penis. I looked at my mother, a little bewildered. She remained sitting naked on the platform

, smiling at me without saying a word. "Please line up and come up one by one in an orderly fashion. Please don't touch it too hard; a man's penis can be quite fragile sometimes,"

Teacher Chen instructed.

So, all thirty-odd female students lined up in front of me. The first girl to come up was Hu. She touched my penis shyly and quickly withdrew her hand, causing the girls behind her to burst into laughter.

The next few girls came up, much bolder. They imitated Teacher Chen, gently stroking my penis, and one even touched my scrotum.

Then came the boldest one, Wang.

She first used her gloved hand to stroke my penis a few times, then touched my scrotum. Just when I thought it was over, she squatted down and took my penis in her mouth, sucking on it a few times.

I stared at her in shock, then at Teacher Chen. The teacher didn't say a word of reprimand; it seemed she didn't object to Wang's bold actions.

I thought helplessly: How tragic that my virginity would be destroyed by a girl's mouth! The next group of girls, some timid, only touched me briefly before turning away, while others, bolder ones, followed Wang's example and took my penis in their mouths to suckle. With so many girls constantly stimulating me, my penis quickly became very hard, the glans almost touching my stomach.

"Alright, students, look, Li's penis is fully erect after the foreplay. That's the purpose of foreplay.

Actually, besides caressing and oral sex, kissing is also very important for foreplay in male-female intercourse.

Now, I'll demonstrate kissing."

Teacher Chen walked up to me and said, "Li, have you ever kissed before?" I shook my head to indicate no.

"Then let me guide you! Please open your mouth," Teacher Chen brought her mouth close to mine, then slipped her tongue into mine.

To be honest, this was my first kiss.

I was surprised to find that kissing could be so fun.

I sucked on her tongue, then put my own tongue into her mouth.

The kiss lasted for about three minutes before she asked, "Now, is it safe for Li's penis to be inserted into her vagina?" "Teacher Chen, could Li demonstrate insertion?" Needless to say, it was the mischievous Wang who spoke.

"Although such a demonstration may inevitably have a pornographic element, it's important for teenagers to have proper sex education. Could Ms. Li agree to demonstrate sexual intercourse with Li, giving the other students a chance to witness it firsthand and learn how to have sex with the opposite sex?" Did Teacher Chen really want my mother and me to perform this incestuous sexual intercourse demonstration in front of more than thirty female students? I was so shocked that my mouth dropped open and I couldn't close it for a moment.

What surprised me even more was my mother's attitude. She nodded without hesitation and said, "As long as it can help these students, I don't mind giving this demonstration."

"Since Li's mother agrees to give a sexual intercourse demonstration, then Li, please come over here," Teacher Chen gestured for me to walk to the front of the podium. "Classmates, in order to observe more clearly, you can come to the edge of the podium, but please do not disturb Li and his mother's sexual intercourse."

So all thirty-odd female students in the class gathered around.

I was both excited and nervous. Was I really going to have sex with my mother in front of so many girls? I gripped the base of my penis with my right hand, the glans pointing towards my mother's vaginal opening, but I didn't dare to insert it.

Teacher Chen gently nudged me from behind, and I thrust forward, my glans pressing against my mother's clitoris.

My mother let out a soft "Oh," and slightly adjusted her position, allowing my penis to enter her vagina.

"Wow! It's in!" several female classmates exclaimed.

"Good," Teacher Chen explained, "This is sexual intercourse.

Li's penis has successfully entered Li's mother's vagina. Of course, this kind of insertion requires the woman's vagina to be sufficiently lubricated; otherwise, the woman's vagina may feel uncomfortable due to injury." "

So how can it be sufficiently lubricated?" one of the girls asked.

"Men can make a woman's vagina fully lubricated by caressing her, and even by giving her oral sex.

Li, why don't you try giving your mother oral sex?" I looked at my mother, and she nodded at me with a rosy face.

So I pulled out my penis, squatted down slightly, and licked my mother's vaginal opening a few times with my tongue.

Teacher Chen smiled and said, "It seems that Li hasn't mastered the method of oral sex yet.

You can first lick back and forth on your mother's labia majora and minora, and then use the tip of your tongue to tease your mother's clitoris. The clitoris is the most sensitive sexual organ for women."

I did as Teacher Chen taught me, and my mother indeed cried out in excitement.

"Teacher Chen, what does it mean when Mom Li makes an 'ah' sound?" Wang asked again.

"It means Mom Li is sexually aroused, which is usually called a moan.

Look, there's already some vaginal fluid coming out of Mom Li's vagina, right?" "Really! There's a lot of vaginal fluid coming out of Mom Li's!" "Teacher Chen, it seems like Mom Li's vaginal opening is still wriggling!" "You students observed very carefully! This wriggling means that Mom Li wants a penis to be inserted.

Li, try inserting your tongue."

So I put my tongue into Mom's vagina and thrust it in and out.

My mother soon let out another series of moans, "Ahhh~".

"What do you feel?" Teacher Chen asked me.

"Teacher Chen, Mom's vagina feels wet and slippery inside, and it seems like there's fluid seeping out from the vaginal walls!" "That's right," Teacher Chen said, "This clearly shows that your mother urgently needs your penis to penetrate her and have sex with her.

Li, now insert your penis into Mom's vagina and thrust back and forth."

I followed Teacher Chen's instructions and began to have sex with my mother.

"Teacher Chen, Li's penis doesn't seem to be fully inserted yet!" This time, someone asked such an explosive question.

"Very good question!" Teacher Chen explained. "Li's penis is estimated to be nine inches long, while Li's mother's vagina is probably no more than seven inches deep. Therefore, Li's penis can only go in this far; any further and it will penetrate his mother's uterus."

"Isn't that okay?" asked the same girl from before.

"It's not that it's impossible, but our sex demonstration today doesn't require penetration into the uterus.

Li's mother, could you let your son have sex with you in your uterus?" "Yes, I can!" the mother nodded.

"Li, try inserting it again!" Teacher Chen said.

I slowly inserted my penis again, and the head of my penis quickly touched a soft spot. My mother let out a soft moan, and her lower body trembled slightly.

I knew that the head of my penis had reached the opening of my mother's cervix.

I looked at my mother, unsure whether to continue.

My mother smiled slightly at me, her face flushed, and said, "Don't move, let me do it!" So my mother slightly lifted her lower body, and I felt my glans push open that soft flesh and enter my mother's uterus.

"Wow! It's all the way in!" "Mother Li's vagina is really amazing! I wonder if I could do it!" Several girls chattered excitedly.

"Alright, Li and his mother have successfully demonstrated penetration into the uterus for us. It was a very successful demonstration. Do you have any questions?" Teacher Chen continued to ask.

"Teacher Chen," Wang stepped forward again, "didn't you say that the anus can also be used for sexual intercourse? Could you ask Li and his mother to demonstrate for us?" "This class is about to end," Teacher Chen said, "Ms. Li, could you demonstrate anal intercourse again next class?" The mother nodded and said, "As long as it helps the students' learning, I'm happy to help."

"Okay, Li, you can pull your penis out now.

That's all for this class. Students can discuss any questions next time."

I reluctantly pulled out my penis, and at that moment, due to the prolonged erection and various physical and mental stimulation, I couldn't hold back any longer and ejaculated! A stream of milky, viscous semen shot out from the tip of my penis. Just as my glans left my mother's vaginal opening, most of the semen landed at the entrance, with some splashing onto her stomach.

Ms. Chen was stunned by the unexpected ejaculation. The other students stared at me blankly, as if I were a monster. My mother, her face flushed, looked at me silently.

"Ms. Chen, is this ejaculation?" a female student whispered.

"That's right, that's ejaculation," Ms. Chen seemed a little dazed. She dipped her hand in some semen and said, "Such a little semen can conceive many children.

Students, if you want to enjoy the pleasure of sex without hurting yourselves, you must take effective contraceptive measures. Next class, I'll teach you how to use condoms."

I stood incredibly embarrassed in front of the podium until someone handed me a pack of tissues, which brought me back to my senses.

"Thank you!" I said.

It was that mischievous student, Wang! She looked at me sympathetically and said, "It's not your fault. Unless you're not a normal man, who can guarantee they won't ejaculate?" I thanked her again and began wiping the semen from my mother's vaginal opening, then from her stomach.

My mother obediently let me wipe her clean until it was all gone. Only then did she close her legs and get off the platform to put her underwear and skirt back on.

I was surprised to find my mother so beautiful and sexy, and at the same time, I was glad I could have sex with her.

I even started looking forward to the next sex demonstration.

Yes, I looked forward to having sex with my mother again! This extremely lewd sex demonstration ended just like that. The hotel where Teacher Chen treated us to lunch was not far from the health school. Although it wasn't a luxurious hotel, the decor was unique. The private rooms weren't large, but they had a very romantic atmosphere, perfect for small gatherings of three to five people. The health school's male and female students often dined here for their rendezvous.

"Mother Li, student Li, please order whatever you like, don't be shy,"

Teacher Chen said, taking the menu from the hotel waiter after we were all seated. The private room had been booked in advance by Teacher Chen.

Ms. Chen, who had been wearing a professional outfit in class, had changed into a white tank top with an orange vest over it, and an orange floral skirt, looking quite vibrant.

"Ms. Chen, please don't be so polite. Xiaoming and I are very casual about meals."

"Then let's each order one dish!" Ms. Chen said, handing over the menu.

My mother took the menu and looked at it. She ordered scallion ribs, I ordered a double-flavored fish head, and Ms. Chen then ordered stir-fried river shrimp, stir-fried water spinach, and a bowl of mushroom and turtle soup.

"What kind of wine do you like to drink?" Ms. Chen asked.

My mother quickly shook her head and said, "I don't usually drink much."

Knowing her usual preferences, I said, "Have some beer!" So Teacher Chen ordered three more bottles of beer.

After all the dishes were served, Teacher Chen instructed the waitress to wait outside and specifically told her not to come in casually.

"Mrs. Li, thank you so much today!" Teacher Chen stood up and ladled a bowl of soup for my mother.

"You're too kind, Teacher Chen."

Teacher Chen was about to ladle some soup for me, but I quickly took the ladle from her hand, ladled a bowl of soup for Teacher Chen first, and then ladled one for myself as well.

"Mmm, this soup tastes really good!" My mother said after taking a sip of soup.

"The most special dish here must be this mushroom and turtle soup," Teacher Chen said, raising his glass to suggest we all have a drink.

"There wasn't supposed to be a sex demonstration in today's class; it was a last-minute request from the students. I didn't expect Li's mother to agree so readily. I'm truly grateful!" "It's just a small thing, yet it's such a hassle

for you, teacher. Actually, it's my honor to be able to help the students."

Teacher Chen and the mother exchanged pleasantries and toasted each other.

Then, Teacher Chen raised his glass to me, saying, "Li, thank you too today! Your performance was excellent."

"You flatter me, teacher!" Teacher Chen and I also toasted each other.

"Li, may I ask you a question? You don't have to answer," Teacher

Chen said, looking into my eyes. "Was your sex demonstration with your mother today your first time?" I was stunned, not expecting Teacher Chen to ask such a private question. I looked to my mother for help, and she smiled and said, "Xiaoming, just tell the truth. Mom is also very curious."

I said, "Teacher Chen, does masturbation count?" Teacher Chen and my mother both laughed.

Teacher Chen said with a smile, "Masturbation doesn't count."

"Then that's it,"

I said honestly.

"So, your sexual demonstration with your mother was your first time? Li's mother, your son's..." "I believe that since sexual intercourse is a pleasurable experience, there shouldn't be so many taboos. As long as both parties are willing and it doesn't affect family harmony, it's fine to do it."

"So, Teacher Chen approves of mother-son sexual intercourse?" "Whether you approve or not, you need to give a reason.

The son's body is conceived and grows in the mother's womb, and then comes into this world through the mother's vagina. A part of the son's body returns to the mother's body to create pleasure. What's wrong with that?" Teacher Chen's words surprised me greatly; I never expected her to have such open-minded thoughts! I sat to the side listening to Teacher Chen and my mother's conversation, unable to get a word in edgewise.

"If Teacher Chen had a son, would you have sex with him?" "It's a pity I had a daughter, which is why I envy Mother Li!" Teacher Chen then asked the mother, "Mother Li, would you have sex with your son?" The mother glanced at me and said, "It depends on the situation. If it's like today, and my son doesn't object, I would."

Teacher Chen then asked me, "Student Li, would you have sex with your mother?" I looked at my mother, and she was looking at me gently.

I replied, "I'm willing too." Teacher Chen said, "It's clear that you and your son are of one mind! This was also proven in class today.

Li's mother, when your son penetrated you, your vagina was fully lubricated, which proves that you were expecting him to penetrate you.

And Li's son ejaculated at the end, which proves that he enjoys having sex with his mother.

Li's mother, how is your sex life with your husband?" "Well... actually, my husband got prostatitis two years ago, and we haven't had sex much in the past two years." "

I see! Women who lack the nourishment of sex life will age very quickly! Li's son, your mother's sexual happiness will depend on you from now on!" My mother blushed and said, "Teacher Chen, please don't say that. He's still just a student, and he's not even an adult yet."

"Mrs. Li, although your son is not yet of legal age, his body is already very well developed, isn't it? To be honest, even when my husband was at his best, his penis wasn't as big as his."

The mother said, "That's true, my husband's penis isn't as big as his either.

Teacher Chen, how is your sex life?" "To be honest, my situation is similar to yours in terms of sex life.

My husband is often away on business trips abroad, and when he comes back, we rarely have sex."

"Have you ever thought about having an affair, Mr. Chen?" "I'm a teacher, and I'm not the kind of person who's casual about sex.

What about you, Mrs. Li?" "Although my husband isn't in the best of health, he loves me very much, and I have a lovely son. I cherish my family's happiness!" Mr. Chen nodded and said, "I can see that Mrs. Li cares a lot about her husband and son.

But if it were to have sex with your son, and your husband didn't object, would you do it?" "Maybe... I would."

The mother blushed again as she spoke.

The three bottles of beer were quickly finished. Teacher Chen asked, "Would you like three more?" "Teacher Chen, you can't drink anymore,"

Mom quickly stopped me. "You have to go to work this afternoon, and Xiaoming isn't an adult yet; he can't drink too much."

"That's what I thought too. Let's eat then!" Teacher Chen said.

I quickly got up and served Teacher Chen and Mom each a bowl of rice.

"Mrs. Li, next time I teach a sex demonstration class, I want to teach the students more sexual positions and how to properly use condoms. Would you be willing to accept the invitation?" I was eagerly awaiting my mother's approval.

Mom thought for a moment, looked at me again, and then nodded, saying, "I feel very honored as long as I can help my classmates."

Teacher Chen smiled and said, "Ms. Li, that's wonderful! Could we do some pre-reading now?" "What? Is it here?" "Yes, right here."

Mom's face flushed red. She said, "Well... if Teacher Chen would like to give a demonstration first, I'd like to do some pre-reading too." "Yes, that's fine."

Teacher Chen looked at me, then smiled and said, "Is Li's mother comfortable with me having sexual contact with Li?" "Teacher Chen is old enough to be my son's mother, what do I have to worry about?" Teacher Chen nodded, then turned to me and said, "Will Li think I'm too old?" I never dreamed I could have sex with the most beautiful teacher in the whole school, this is truly unexpected! But I was afraid that if I was too enthusiastic, my mother would be unhappy, so I looked at her and asked, "Mom, is it okay?" My mother nodded and said, "Xiaoming, you didn't do very well this morning. Now, when you're with the teacher, you have to behave well!" As soon as my mother said this, Teacher Chen called me over to her side. She first took off my pants, and then started taking off her own skirt.

Soon, our lower bodies were completely naked.

"Mother Li, look how big your son's penis is!" Teacher Chen said, reaching out and grasping my penis.

"What does Teacher Chen plan to do?" my mother asked, walking up to us. Her gaze lingered on my penis.

Ms. Chen gestured for me to sit in the chair. Then, facing my mother with her back to me, she held my penis in her left hand and gently sat down, parting her labia majora and minora with her right. My glans slid into a warm, moist passage.

My mother looked down and asked, "Ms. Chen, is it in?" "Look, it's all in! Your son's penis is so long, the glans is even touching my uterus."

My mother laughed and said, "I already felt it in class today. Ms. Chen, does it feel good?" "Mrs. Li, we're demonstrating sex right now, whether it feels good or not isn't that important, is it?" My mother blushed and said, "Ms. Chen

is right."

The teacher, bobbing his body up and down, said, "But to be honest, young men's penises are different, so big and hard, it feels really good inside them!" Mom chuckled, "Teacher Chen, can you feel pleasure during a sex demonstration?" "A sex demonstration is sex too! This morning in class, your son's penis was inside you, didn't you feel pleasure too? And you made such lewd moans!" Mom blushed and didn't speak.

Teacher Chen played with him for a while, then stopped.

"Student Li, now let your mother come up and have sex with you, and I'll be your guide."

Teacher Chen pulled off me.

"Why isn't Li's mom taking off her skirt? Do you want your son to help you take it off?" Mom quickly said no, and took off her skirt and underwear herself, exposing her entire lower body.

Mom walked up to me and used the same sexual position that Teacher Chen and I had just done to insert my penis. She sometimes moved up and down, sometimes swayed from side to side. Mom's vagina was a little looser than Teacher Chen's, and there was more fluid inside.

"Li, the position your mom is doing with you now is called 'Guanyin Sitting on a Lotus.'

You can put your hands inside Mom's clothes and caress her breasts."

I tentatively put my hands inside, and seeing that Mom didn't object, I boldly started playing with her breasts.

However, my clothes were in the way, and I thought to myself: "If only Mom would take her clothes off too."

As if hearing my thoughts, Teacher Chen said, "Mother Li, please take your clothes off as well. It will make it easier for your son to caress you."

Mom hummed in agreement, sat on my penis, and took off all her clothes, leaving her completely naked.

I happily kneaded and squeezed her breasts.

"Mother Li, isn't it great to caress and have sex at the same time?" Teacher Chen asked.

Mom nodded without saying a word.

"Now turn around and have sex with your son in the same position!" Teacher Chen said.

My mother obediently turned around, still sitting on my penis, facing me.

"That's right, just like that," Teacher Chen continued explaining, "This position is called 'Old Tree Roots.'

Li, you can suck on Mom's nipples and caress her buttocks with your hands."

So I did as Teacher Chen said.

My mother quickly let out a lewd moan, her eyes slightly closed, looking ecstatic, and her lower body moved faster.

Teacher Chen quickly said, "Stop."

My mother opened her eyes and looked at Teacher Chen in confusion.

"Mother Li, you can't reach orgasm yet, you know? There are many more sexual positions to try."

Then, Teacher Chen told my mother to get off me, put her hands on the chair, and let me fuck her from behind.

"This position is called 'riding archery,' also known as 'doggy style.'

In this position, the man can penetrate very deeply."

I fucked my mother from behind, and this position gave me a sense of conquest, as if my mother had become a mare under my crotch. Unfortunately,

after only a few dozen thrusts, Teacher Chen told me to stop, which made me very unhappy.

Next, under Teacher Chen's guidance, my mother and I tried five or six more sexual positions.

The most interesting one for me was standing face-to-face with my mother while we had sex.

I'm ten centimeters taller than my mother. With my penis inside her vagina, the head of my penis naturally slid into her uterus when I stood up straight.

Teacher Chen had us dance while having sex.

My mother's dance was incredibly graceful. I'm not usually good at dancing, but with my mother's guidance, I actually danced quite well.

This sexual position was incredibly lewd, and I quickly ejaculated under intense stimulation.

"Oh, Mom~" My semen shot directly into my mother's uterus, then flowed out of her vagina and dripped onto the ground.

I gasped for breath; the intense orgasm left me feeling exhausted.

"Xiaoming, my good son."

Mom hugged me tightly, stroking my face and bottom with her hands. "Teacher Chen, my son ejaculated, can we stop now?" "Ah, Li's mother, congratulations! This is Li's virgin semen! Now you two separate," Teacher Chen separated my body from Mom's, then reached down to collect some semen from Mom's genitals, saying, "You've ejaculated so much, this semen can help you have many children." "Where's the semen?"

Mom looked at the semen in Teacher Chen's palm, her face flushed with embarrassment. She said, "Teacher Chen, I didn't expect him to ejaculate so quickly!" Teacher Chen smiled and said, "Yes, it's a pity that Li's mother didn't even reach orgasm before he ejaculated! Li, you have to work hard in the next sex demonstration class. It's a man's responsibility to satisfy his sexual partner, do you understand?" After that, Mom, Teacher Chen, and I got dressed and sat down again to eat.

After the sex demonstration, my sex skills improved again.

Although I've watched a lot of porn, watching others have sex and experiencing it yourself are completely different things. Sex requires practical experience! And so, my mother and I ended this extremely lewd sex preparatory class.

My only regret was that I hadn't brought my mother to orgasm.

Back home, I tried to break the bond between my mother and me.

But I quickly found it wouldn't work.

Every time I tried to get close to my mother, she would stop me with an unwavering gaze. I felt very frustrated and could only look forward to the next sex demonstration class.

A week later, Ms. Chen invited my mother and me again.

We went to her office, and this time she didn't ask me to go to another room to change. Instead, she took us directly to the classroom next door.

The moment we entered, the female students in the classroom clapped in unison, seemingly very excited for this sex demonstration lesson.

Teacher Chen walked to the podium and announced, "Today we will learn two things: one is how to correctly use a condom, which is very important for you; the other is the common sexual positions.

To make it easier for you to observe, I would like you to move your desks around."

All the female students moved their desks to the perimeter of the classroom.

Teacher Chen then asked my mother and me to walk to the open space in the center of the classroom.

"Mother Li, student Li, you can take off your clothes now,"

Teacher Chen said.

We quickly took off all our clothes.

Although this was the second time I'd displayed my naked body in front of so many female students, I still felt a little uncomfortable. My mother seemed more at ease than I was.

"Now we'll learn how to use a condom correctly,"

Ms. Chen said, taking a small plastic bag from her pocket. She gently tore open the bag, showed the contents to the students, and said, "Look, this is a condom.

Does anyone know how to put one on?" At this moment, a female student stood up and said, "Can I try?" It was the somewhat shy student, Wang, who spoke.

Ms. Chen said, "Sure."

Wang took the condom from Ms. Chen and walked over to me. She put the opening of the condom on my glans and then gently rubbed it down.

Since my penis was already erect, she quickly put the condom on for me.

"Teacher, did I do it right?" Teacher Chen nodded and said, "You've done very well. However, the man's penis should be fully lubricated before putting on the condom, otherwise the man will lose his libido due to pain.

Li's mother, could you please demonstrate for the students?" The mother nodded and said, "Okay."

So the mother walked up to me. Unlike Wang, who was bending over, she squatted down in front of me. She gently took off the condom for me, then opened her mouth and sucked on my penis a few times before spitting it out and putting the condom back on for me.

"Did you all see that?" Teacher Chen said. "Mother Li's demonstration was very good.

Of course, there are many ways to make the penis wet, and oral sex is just one of them."

At this moment, a student asked, "Teacher Chen, are there any other ways to put on a condom?" Teacher Chen replied, "Good question. Actually, you can also put on a condom for a man with your mouth.

Does Mother Li know how?" The mother shook her head and said, "No."

"Alright, now I'll demonstrate how to put on a condom with my mouth."

Ms. Chen, like a mother, knelt down in front of me. She took off the condom, licked my penis for a while with her tongue, then sucked on it. "Class, now Li's penis is fully lubricated. Now, pay close attention to how I put on a condom with my mouth."

After saying this, Ms. Chen put the condom in her mouth, leaving the opening outside, pressing it against my glans. She slowly swallowed my penis, and when she released it, the condom was on.

A burst of enthusiastic applause erupted in the classroom.

Next was condom-wearing intercourse.

Ms. Chen gestured for me to lie down on the classroom floor. Because the floor was cold, she suggested using the clothes my mother and I had taken off as a cushion.

After I lay down, Ms. Chen nodded to my mother, who didn't hesitate. She straddled me with one leg, slowly squatted down, grasped the base of my penis with one hand, and gently stroked it a few times. With her other hand, she spread her labia majora and minora, brought her vaginal opening to my glans, and gently sat down.

All the girls in the class gathered around, watching intently, some whispering amongst themselves.

"It really went in."

"Will wearing a condom affect the pleasure?" Teacher Chen had obviously heard their discussion. She smiled and said, "Wearing a condom will certainly affect the pleasure, but it is still necessary to wear a condom to ensure safety."

"If you don't want to have children, you must insist that your partner wear a condom when you have sex."

"But you can also take birth control pills!" said Wang, the student.

"Every medicine has side effects, you understand?" Teacher Chen said seriously. "Taking too many pills is very bad for your health, especially for teenage girls like you, you should avoid taking them."

While Teacher Chen was educating the students, my mother, sitting on my penis, looked very embarrassed, unsure whether to get off or continue sitting.

"Mother Li, you can get off now,"

the teacher said.

"Next is a demonstration of sexual positions."

After Mom got off me, Teacher Chen removed the condom from my penis and said, "Class, Li's mother has an IUD, so we won't need to wear a condom for the following sexual demonstration. Therefore, you can see the intimate contact between their genitals.

Please observe carefully later, and feel free to ask any questions."

At this moment, student Wang suddenly spoke up: "Teacher Chen, why did you have to choose Li's mother as Li's sexual partner? Isn't incest between mother and son the biggest taboo of incest?" I saw Mom's face turn bright red.

"Wang, you need to understand that what we're doing now is a teaching demonstration, not actual sexual intercourse.

Since Li is still a minor, the teacher needs his parents' consent to have him demonstrate. If we don't invite Li's mother to be her son's sexual partner, then who should we invite?" "Teacher Chen is fine too!" The mother's consent was good, and besides, the teacher would also have to act as a lecturer, which would be inconvenient.

Originally, the teacher wanted to hire a prostitute, but was afraid Li's mother wouldn't agree.

Teacher Chen nodded to the mother and continued, "Actually, a son's body comes from his mother's vagina. What's wrong with a son teaching his son how to have sex using the vagina that gave him birth?" "Then what constitutes incest between mother and son?" someone asked.

"Incest is defined as unnatural sexual behavior between a mother and son."

"Then what constitutes unnatural sexual behavior?" The same student asked again.

Teacher Chen pondered for a moment and said, "For example, incest between a mother and son behind the father's back, or incest between a mother and son resulting in a child of incestuous generation."

"Does Teacher Chen mean that as long as you don't have children and don't do it behind your family's back, it's not incest?" This time it was that same student, Wang.

Teacher Chen said, "That should be the case."

Student Wang then asked, "Then is it the same for fathers and daughters?" Teacher Chen said seriously, "Sexual activity between fathers and daughters is not as simple as that between mothers and sons.

Because a virgin's hymen is intact before she loses her virginity, if a girl loses her virginity too early, and her future husband cares about her virginity, it could lead to marital unhappiness." "

So, mother-son sex only requires the father's consent, while father-daughter sex requires not only the mother's consent but also the husband's? Isn't that unfair?" "There are many unfair things in this world.

Okay, this lesson isn't for discussing ethics.

Next, my mother and I demonstrated several types of sexual intercourse in front of the thirty-odd female students in the class." The teacher demonstrated positions, even anal sex.

To be honest, neither my mother nor I like anal sex. When I forced my penis into my mother's anus, she trembled with pain, which broke my heart.

Near the end of class, Teacher Chen suddenly announced, "Class, how about we have Li and his mother give us a full demonstration of sex?" The classroom erupted in cheers.

I looked at my mother; she was already in position, just waiting for me to fuck her.

I inserted my penis into her from behind. This time, it wasn't a mere demonstration, but a real, full-on penetration.

To increase my mother's sexual stimulation, I thrust my penis in and out while caressing her breasts, thighs, and buttocks with both hands.

My mother quickly became aroused; she couldn't help but moan loudly, and her vagina became increasingly wet, with vaginal fluid constantly seeping from the point of our genitals, wetting the classroom floor.

"Teacher Chen, why is so much fluid coming out of Li's mother's vagina?" a student asked.

Teacher Chen explained, "This is vaginal fluid.

It flows out when a man and woman experience pleasure during intercourse. Its purpose is to prevent damage to the vagina from vigorous thrusting.

Look, Mother Li is on the verge of orgasm."

Suddenly, I felt my mother's vagina convulse violently, and a gush of vaginal fluid sprayed onto my glans. Immediately afterward, my mother's body trembled uncontrollably.

"Ahhh~" my mother let out a lewd sound.

"Class, look! This is a classic orgasm symptom! Li's mom is probably experiencing an orgasm right now; it's the happiest moment for a woman,"

Teacher Chen explained. Then she said to me, "Li, you did a really great job today. It would have been even better if you could ejaculate inside your mom."

Before Teacher Chen finished speaking, I had already started ejaculating.

I held my mom's legs tightly with both hands, and streams of hot semen shot deep into her vagina.

I thrust a few more times and then lay motionless on my mom's back.

"Wow, Li ejaculated!" "Look how much he's sweating!" the female classmates around me exclaimed.

Teacher Chen instructed me to withdraw my penis so that the students could see my mother's vagina, which had been penetrated by semen.

"Look, this milky white liquid is semen.

When Li's father ejaculated inside Li's mother's vagina, it fertilized an egg released from her body, resulting in his birth."

"Would Li have had a child if he ejaculated inside his mother's vagina?" someone asked.

"No," Teacher Chen said, "because Li's mother has an IUD."

Then, my mother squatted down, letting the semen flow out of her vagina, before getting up and dressing.

This long-awaited sex demonstration class has come to an end. I finally got to fuck my own mother's cunt and even ejaculated my incestuous semen inside her vagina.

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