Favorite Sex Demonstration Class

This happened when I was a third-year student at nursing school.
It was June of that year, right after the graduation exams. Having nothing to do on campus, I 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 current class was all girls, and they were struggling to learn. She asked if I could help tutor the younger girls. 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 for me 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 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 my 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?" Teacher Chen smiled and said, "Just give a demonstration for the female students."
"A demonstration? What kind of demonstration?" I couldn't recall ever having a human anatomy demonstration class! Teacher Chen smiled and said we'd find out later. Seeing she didn't want to elaborate, I didn't ask further.
Teacher Chen also asked me to bring my mother along, 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 was Huang Meilian, 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, handsome and considered a good-looking man by everyone.
The next morning, my mother and I went to Teacher Chen's office.
Although her office wasn't large, it was a private room for one person, simply furnished but very clean.
"Hello, Ms. Chen! This is my mother."
I introduced them to each other. Ms. Chen looked at my mother; she was 35-24-36, a standard model figure.
I was eighteen years old then, 1.78 meters tall, weighing 69 kilograms, and quite handsome—a universally acknowledged good-looking man.
The next morning, my mother and I went to Ms. Chen's office.
Although her office wasn't large, it was a private room for one person, 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 hasn't ended 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 sternly.
A girl stuck out her tongue and said, "Didn't the teacher announce that the next class would be a nude model class? We want 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 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 senior student, to be your nude model. Later, you can learn about the differences between men and women by observing the male body."
The more than thirty girls in the audience applauded together.
I suddenly felt something was wrong, but it was too late to regret it now.
"Li, please take off your clothes."
Ms. Chen nodded at me.
I reluctantly took off my only piece of clothing, a sweatshirt, revealing my fairly muscular chest.
"Please take off your pants too."
I glanced at Ms. Chen; she looked at me resolutely, so I had no choice but to take off my athletic shorts as well.
"And take off these briefs too,"
Ms. Chen continued.
If I took them off any more, I'd be completely naked, standing on the platform in front of so many female students. Was this what Ms. Chen meant by "human body demonstration"? Embarrassed, I took off my only piece of clothing, my underwear, and covered my private parts with my hands.
All thirty-odd pairs of eyes in the class stared at me. This was the first time in my life I'd been completely naked in front of women, and more than thirty women at once.
"To provide a comparative teaching method with the male body, I'd like to invite another female student to come up and demonstrate the female form.
Which student would like to come up?" Ms. 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 give us a demonstration of female nudity. Ms. Li, is that alright?" As I stared at Teacher Chen in surprise, my mother stood up from her seat. She walked shyly to the front of the class and asked, "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 thought she definitely wouldn't agree. Unexpectedly, she looked at Teacher Chen and said, "Okay, for the sake of the students' learning, I'm willing to give a demonstration of female nudity."
After saying that, my mother took off her skirt. Underneath, she was wearing a set of blue floral lace lingerie. The lingerie was designed to be very sexy; except for a small piece of fabric embroidered with a few flowers in the front, the rest was almost entirely transparent.
My mother seemed to have made up her mind. Without any hesitation, she took off her lingerie and stood confidently beside me.
It was the first time I had ever seen my mother naked, and I never imagined she had maintained such a good figure! Her breasts were large and firm, her abdomen smooth and taut, 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 entity standing before you. I'd like to ask one of you to tell me the differences between them,"
said Teacher Chen, gently tapping my hand covering my lower body with her pointer.
I awkwardly placed my hands behind my back, my penis limp and drooping due to nervousness, looking somewhat comical.
Several students raised their hands.
"Hu Yumei, please tell us,"
Teacher Chen said, pointing to a bespectacled girl in the front row.
"Men have prominent Adam's apples, while women don't; women have full breasts, while men don't,"
said Hu.
"Anything else?" Teacher Chen asked.
"This~" Hu's face suddenly turned bright red, she shook her head and sat down.
"Wang Yingying, what other differences do you think there are between male and female bodies?" Teacher Chen then pointed to another girl and asked.
This time, 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. "Men have a protruding penis, while women have a vaginal 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 pointed to the corresponding part of my lower body with the pointer and explained, "As for women, their external genitalia are more concealed.
Li's mother, could you please sit on the podium and demonstrate your external genitalia to the class?" "Sure,"
my mother readily agreed. She sat on the podium, 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 the female lower body,"
Teacher Chen explained, walking over to the mother. "Look, the smaller orifice at the top is called the urethra, 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, the vagina, used for sexual intercourse and also the birth canal.
The smaller, tightly closed orifice at the bottom is called the anus, generally used for defecation."
"Teacher Chen, what do you mean by 'generally'? Doesn't the anus only serve 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 only a woman would do,"
Teacher Chen explained.
"So, how do men engage in sexual intercourse with women?" This time, the mischievous student, Wang, asked.
"Although this isn't the topic of today's lesson, it's crucial knowledge for you all. So, would you please have Ms. Li demonstrate sexual intercourse?" Ms. Chen's decision was met with unanimous applause from the class.
"Ms. Li, do you have any questions?" "No," Ms. Li shook her head, "but how should I demonstrate?" Ms. Chen walked over to Ms. Li and said, "It's actually quite simple. For example, the pointer in my hand represents a male penis. You see, inserting the penis into the vagina like this is sexual intercourse."
As Ms. Chen explained, she carefully and gently inserted the pointer into Ms. Li's vagina.
"Ms. 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 quite meticulous.
Therefore, before intercourse, in order to ensure the male's penis is fully erect, foreplay is necessary, 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 never expected that the most beautiful teacher in the whole school would actually help me masturbate, and stimulated by this, my penis naturally reacted.
"Now, please come up and touch Li's penis, and experience firsthand how to help a male's penis achieve a full erection."
I could hardly believe that Teacher Chen was going to let all the girls come up and touch my penis. I looked at my mother somewhat bewildered, and she was still sitting naked on the podium, smiling at me without saying a word.
"Please line up and come up one by one in an orderly manner to touch it. When you touch it, please don't use too much force, as a male's penis can sometimes be quite fragile,"
Teacher Chen instructed.
So all thirty-odd girls in the class lined up in front of me. The first girl to come up was Hu, who shyly touched my penis before quickly pulling her hand away, causing the girls behind her to burst into laughter.
The next few girls were much bolder; they imitated Teacher Chen, gently stroking my penis, and one even touched my scrotum.
Then came the boldest, 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 sucked on my penis a few times.
I stared at her in shock, then at Teacher Chen. The teacher didn't say a word of reproach; it seemed she didn't object to Wang's bold actions.
I thought helplessly: How could my virginity be ruined by a girl's mouth? How tragic! The girls who followed were either timid and turned away after just a touch, or bolder ones who, like Wang, opened their mouths and sucked on my penis. With so many girls stimulating me, my penis quickly became very hard, the glans almost touching my stomach.
"Alright, students, look, Li's penis is fully erect from the foreplay. That's the purpose of foreplay.
Actually, besides touching and oral sex, kissing is also very important in foreplay.
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 I'll guide you! Please open your mouth," Teacher Chen brought her mouth close to mine, then put her tongue into my mouth.
To be honest, this was my first time kissing.
I was pleasantly surprised to find that kissing was such a fun thing.
I sucked on the teacher's tongue, then put my own tongue into Teacher Chen's mouth.
The kiss between Ms. Chen and me lasted for about three minutes. Then she said, "Now, is it safe for Li's penis to be inserted into the vagina?" "Ms. Chen, could Li demonstrate insertion?" Needless to say, it was that mischievous Wang who spoke.
"Although such a demonstration may inevitably have a pornographic connotation, it's important for teenagers to have proper sex education. Would Li's mother agree to give Li a demonstration of intercourse, so that the students can have a chance to witness it firsthand and learn how to have sex with the opposite sex?" Did Ms. Chen really want my mother and me to do this kind of incestuous sex 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 for a moment," Teacher Chen gestured for me to walk to the front of the podium. "Classmates, in order to observe more clearly, you can come up to the side 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 head pointing towards my mother's vaginal opening, but I didn't dare to insert it.
Teacher Chen gently pushed me from behind, so I took the opportunity to thrust forward, the head of my penis pressing against my mother's clitoris.
My mother let out a soft "Oh," and slightly adjusted her lower body angle, and my penis entered my mother's vagina.
"Wow! It went in!" several female classmates exclaimed.
"That's right," 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?" one of the girls asked.
"Men can lubricate a woman's vagina by caressing her, or 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 flushed face.
So I pulled out my penis, squatted down slightly, and stuck out my tongue to lick my mother's vaginal opening a few times.
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 excitedly.
"Teacher Chen, what does Li's mother's 'ah' sound mean?" Wang asked again.
"It means that Li's mother has already felt sexually aroused, which is usually called a moan.
Look, there is already vaginal fluid flowing out of Li's mother's vagina, right?" "Really! There is a lot of vaginal fluid flowing out of Li's mother's vagina!" "Teacher Chen, Li's mother's vaginal opening seems to be wriggling!" "The students are very observant! This wriggling means that Li's mother wants the penis to be inserted.
Li, try inserting your tongue in again."
So I inserted my tongue into my mother's vagina and thrust it in and out.
My mother quickly let out another series of moans, "Ahhh~".
"How do you feel?" Teacher Chen asked me.
"Teacher Chen, my mother's vagina feels wet and slippery, and it seems like there's water 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 your mother'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 probably nine inches long, and Li's mother's vagina is probably no more than seven inches deep, so Li's penis can only go in this far; any further and it will penetrate into his mother's uterus."
"Isn't that okay?" the same girl from before asked.
"It's not impossible, but today's sexual demonstration doesn't require insertion into the uterus.
Mrs. Li, could you let your son have sex with you in the uterus?" "Sure!" Mom nodded.
"Li, try inserting it again!" Teacher Chen said.
I slowly inserted my penis again, the glans quickly hitting a soft spot. Mom let out a soft moan, her lower body trembling slightly.
I knew the glans had reached Mom's cervix.
I looked at Mom, unsure whether to go deeper.
Mom smiled slightly at me, her face flushed, and said, "Don't move, let me do it!" So Mom slightly lifted her lower body, and I felt the glans push through that soft flesh, entering Mom's uterus.
"Wow! It's all the way in!" "Mrs. Li's vagina is really amazing! I wonder if I could do that!" Several girls chattered excitedly.
"Alright, Li and his mother have successfully demonstrated penetration into the uterus. It was a very successful demonstration. Do any of you have any questions?" Teacher Chen continued.
"Teacher Chen," Wang stood up again, "didn't you say that the anus can also be used for intercourse? Could you please have Li and his mother demonstrate for us as well?" "This class is about to end," Teacher Chen said. "Li's mother, 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."
"Alright, Li, you can pull your penis out now.
That's all for this class. If you have any questions, you can discuss them next time."
I reluctantly pulled out my penis. 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 white, viscous semen shot out from the urethral opening of my glans. Just as my glans left the mother's vaginal opening, most of my semen shot onto the opening of her vagina, and some shot onto her belly.
Ms. Chen was stunned by the unexpected ejaculation. The 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 asked softly.
"Yes, this is ejaculation," Ms. Chen seemed still somewhat dazed. She dabbed some semen on her hand and said, "This little bit of semen can conceive many children.
Students, if you want to enjoy the pleasure of sex without harming yourselves, you must take effective contraceptive measures. Next class, I will teach you how to use condoms."
I stood awkwardly in front of the podium until someone handed me a pack of tissues, bringing me back to my senses.
"Thank you!" I said.
It was that mischievous student, Wang! She looked at me sympathetically and said, "This isn't 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 belly.
My mother obediently let me wipe her until she was completely clean. 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 that my mother was so beautiful and sexy, and at the same time, I was glad that I could have sex with her.
I even started to look forward to the next sex demonstration class.
Yes, I looked forward to having sex with my mother again! This extremely lewd sex demonstration class ended just like that. At noon, Teacher Chen treated us to lunch at a hotel not far from the nursing school. Although it wasn't a luxury hotel, the decor was unique. The private room wasn't big, but it had a nice atmosphere, perfect for small gatherings of three to five people. Male and female students from the nursing school loved to dine here for their rendezvous.
"Mrs. Li, Li, please order whatever you like, don't be shy."
Teacher Chen had booked the private room in advance. After we were all seated, Teacher Chen took the menu from the hotel waiter and said this.
Ms. Chen was wearing a professional outfit in class just now, but she has changed into a white tank top with an orange vest over it, and an orange floral print skirt. She looks very vibrant.
"Teacher Chen, you don't need to be so polite. Xiaoming and I are very casual about meals."
"Then let's each order one dish!" Teacher Chen said, handing over the menu.
Mom took the menu and looked at it. She ordered scallion ribs, I ordered a double-flavored fish head, and Teacher Chen then ordered stir-fried river shrimp, stir-fried water spinach, and a bowl of fresh mushroom and turtle soup.
"What kind of alcohol do you like?" Teacher Chen asked again.
Mom quickly shook her head and said, "I don't usually drink much."
Knowing Mom's usual preferences, I said, "How about some beer?" So Teacher Chen ordered three 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 Mom.
"Teacher Chen, you're too kind."
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!" Mom said, taking a sip.
"The most special dish here must be this mushroom and turtle soup," Teacher Chen raised her glass, suggesting we all have a drink.
"Today's lesson wasn't originally supposed to include a sex demonstration; 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 the teacher.
Actually, it's my honor to be able to help the students."
Teacher Chen and Mom exchanged pleasantries and toasted each other.
Then Teacher Chen raised her glass to me, saying, "Li, thank you too today! Your performance was excellent."
"You flatter me, teacher!" I also toasted Teacher Chen.
"Li, I'd like to ask a question, though you don't have to answer," Teacher
Chen said, looking into my eyes. "Was today's sexual demonstration with your mother 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. I'd like to know too."
I said, "Teacher Chen, does masturbation count?" Teacher Chen and my mother both laughed.
Teacher Chen smiled and said, "Masturbation doesn't count."
"Then that's it,"
I said honestly.
"So, your demonstration of intercourse with your mother was your first time, Li Mama?" "I think since 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 intercourse?" "Whether you approve or not, you have to give a reason.
The son's body grows and develops 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?" "Unfortunately, I had a daughter, which is what I envy about Li's mother!" Teacher Chen then asked the mother, "Li's mother, would you be willing to 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, "Li, would you be willing to have sex with your mother?" I looked at my mother, and she was looking at me tenderly.
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 looking forward to his penetration.
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 much sex 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 just a student, and he's not even an adult yet."
"Mrs. Li, although your son is not yet a minor in terms of physical 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 when erect."
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 often travels abroad for work, and when he comes back, we rarely have sex."
"Have you ever thought about having an affair, Teacher Chen?" "I am a teacher, and I'm not the kind of person who is casual about sex.
What about you, Mrs. Li?" "Although my husband's health isn't very good, he loves me very much, and I have a lovely son. I'm the kind of person who cherishes family happiness!" Teacher Chen nodded and said, "It's clear 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, we can't drink anymore,"
Mom quickly stopped her. "We have to go to work this afternoon, and Xiaoming is still a minor; he can't drink too much."
"That's what I was thinking 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'd like to teach the students more sex positions and how to properly use condoms. Would you be willing to accept the invitation?" I was eagerly awaiting Mom's approval.
Mom thought for a moment, looked at me again, and nodded, saying, "I would be very honored to be able to help my classmates."
Teacher Chen smiled sweetly and said, "Mrs. Li is so kind! 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."
Teacher Chen looked at me and then smiled, saying, "Mrs. Li, are you 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, "Would Li think I'm too old?" I never dreamed I could have sex with the most beautiful teacher in the whole school! This was truly unexpected! But I was afraid that if I acted too enthusiastically, 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 behave 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.
"Mrs. 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?" Mom asked as she walked up to us, her gaze lingering on my penis.
Teacher Chen gestured for me to sit in the chair, then she faced Mom with her back to me, grasped my penis with her left hand, and gently sat down while separating her labia majora and minora with her right hand. My glans slid into a warm and moist passage.
Mom looked down and said, "Teacher Chen, is it in?" "Look, it's in! Your son's penis is so long, the glans is almost touching my cervix."
Mom laughed and said, "I already felt it in class today.
Teacher Chen, did you feel great?" "Mrs. Li, we're doing a sex demonstration now, whether it feels good or not isn't that important, is it?" Mom blushed and said, "Teacher Chen is right."
Teacher Chen moved his body up and down and said, "But to be honest, young men's penises are different, so big and hard, it feels really good inside!" Mom chuckled and said, "Teacher Chen, can a sex demonstration also have sexual pleasure?" "A sex demonstration is still sex! This morning in class, your son's penis was inside your vagina, didn't you feel pleasure and make such lewd moans!" Mom blushed and didn't say anything.
Teacher Chen played with it for a while, then stopped.
"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?" 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 moved up and down and 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, the clothes were in the way, and I thought: it would be great if Mom took off her clothes too.
Teacher Chen seemed to hear my thoughts and said, "Li's mom, please take off your clothes too, so it will be easier for your son to caress you."
Mom hummed in agreement, sat on my penis, and took off all her clothes. Now, Mom was completely naked.
My hands were kneading and squeezing her breasts, and I was having a lot of fun.
"Mrs. Li, isn't it great to caress and have sex like this?" Teacher Chen asked.
Mom nodded without speaking.
"Now turn around and have sex with your son in the same position!" Teacher Chen said.
Mom obediently turned around, facing me and still sitting on my penis.
"That's right, like this," Teacher Chen continued, "This position is called 'Old Tree Roots.'
Li, you can suck on Mom's nipples and caress her buttocks with your hands."
I did as Teacher Chen said.
Mom quickly let out a wanton moan, her eyes slightly closed, looking ecstatic, and her lower body moved faster.
Teacher Chen quickly said, "Stop."
Mom opened her eyes in confusion and looked at Teacher Chen.
"Mrs. Li, you can't reach orgasm yet, you know? There are many more sex positions to try."
Then Teacher Chen told Mom to get off me, put her hands on the chair, and let me fuck her from behind.
"This position is called 'Horse Riding and Archery,' also known as 'Doggy Style.'"
"This position allows the man to penetrate very deeply."
I was fucking my mother from behind, and this position gave me a sense of conquest, as if my mother had become a mare beneath me.
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 was standing face-to-face with my mother. I'm
ten centimeters taller than my mother, and with my penis inside her vagina, the head of my penis naturally reached deep into her uterus when I stood up straight.
Teacher Chen had us dance ballroom dances while we had sex.
My mother's dance moves were very graceful. I wasn't good at dancing, but with my mother's encouragement, I actually danced quite well.
This sexual position was really 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, separate your bodies," Teacher Chen separated my mother and me, then reached down to collect some semen from my mother's genitals, saying, "You ejaculated so much, this semen can help you have many children."
My mother 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, Li's mother didn't even reach orgasm before he ejaculated, it's a bit of a pity! Li, you must work hard in the next sex demonstration class. It's a man's responsibility to satisfy his sexual partner, do you understand?" After that, my mother, Teacher Chen, and I got dressed and sat down to eat again.
After the sex demonstration, my sexual skills had improved again.
Although I've watched quite a few pornographic films, watching others have sex and experiencing it yourself are completely different things. Sexual intercourse requires practical experience! And so, my mother and I finished this extremely lewd sex preparatory class.
My only regret was that I didn't bring 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 extremely 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 applauded in unison; they seemed to be looking forward to this sex demonstration class as well.
Ms. Chen walked to the podium and announced to the class, "Today's lesson will cover two topics: one is how to properly use a condom, which is very important for you; the other is common sexual positions.
To make it easier for you to observe, I'd like you to move your desks around
the classroom." All the female students moved their desks to the perimeter.
Ms. Chen then asked my mother and me to move to the center of the classroom.
"Mrs. Li, Ms. 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 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 properly use a condom,"
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 mischievous Wang who spoke.
Teacher Chen said, "Sure."
Wang took the condom from Teacher Chen and walked over to me. She put the opening of the condom on my glans and then gently pulled 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 a great job. However, the man's penis should be fully lubricated before putting on the condom, otherwise he 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 had bent over earlier, she squatted down in front of me. She gently removed 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 lubricate the penis, 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 with your mouth.
Does Mother Li know how?" Mother Li shook her head and said, "No."
"Okay, now I will demonstrate how to put on a condom with my mouth."
Teacher Chen squatted down in front of me like Mother Li did. She took off the condom, stuck out her tongue and licked my penis for a while, then put it in her mouth and sucked on it. "Class, now Li's penis is fully lubricated. Next, you should pay attention to how I put on a condom with my mouth."
After saying that, Teacher Chen put the condom in her mouth, leaving the opening outside her mouth, with the opening against my glans. She slowly swallowed my penis, and when she spat out my penis, the condom was on.
A burst of enthusiastic applause rang out 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 our clothes as a base.
After I lay down, Ms. Chen nodded to my mother. Without hesitation, she straddled me, slowly squatted down, grasped the base of my penis with one hand, gently stroked it a few times, and then used her other hand to separate her labia, gently sitting down on my glans.
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?" Ms. Chen clearly heard their discussion. She smiled and said, "Wearing a condom will certainly affect the pleasure, but for safety, it's still very necessary.
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, one of the students.
"Every medicine has its side effects, you understand?" Teacher Chen said in a somewhat serious tone. "Taking too much medicine is very bad for your health, especially for teenage girls like you, you should avoid taking medicine."
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 can get off now,"
the teacher said.
"Next is a demonstration of sexual positions."
After my mother got off me, Teacher Chen removed the condom from my penis and said, "Classmates, Mother Li 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.
You must observe carefully later, and you can ask any questions."
At this moment, student Wang suddenly spoke up: "Teacher Chen, why did you have to choose Mother Li as Li's sexual partner? Isn't incest the biggest taboo of incest?" I saw my mother'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 underage, 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 can do it too!" The mother agreed, and besides, the teacher would also be an instructor, 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 teaching your son how to have sex using the same vagina that gave him birth?" "Then what is incest between mother and son?" someone asked.
"Incest is abnormal sexual behavior between mother and son."
"Then what is abnormal 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 with an incorrect generational order, is considered incest."
"Teacher Chen, does that 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."
Wang continued, "Then is it the same for fathers and daughters?" Teacher Chen said seriously, "Sexual behavior between a father and daughter is not as simple as that between a mother and son.
Because a virgin's hymen is intact before she loses her virginity, if a girl loses her virginity too early, and her future husband values her virginity, it could lead to marital unhappiness."
"So, mother-son sex only requires the father's consent, while father-daughter sex requires both the mother's and the husband's consent. 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 sexual positions in front of the class of over thirty girls, even demonstrating 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 in pain, which broke my heart.
Near the end of class, Teacher Chen suddenly announced, "Class, how about Li and his mother give us a complete 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 my mother's anus from behind. This time, it wasn't a mere demonstration, but real fucking.
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, her vagina becoming increasingly wet, with vaginal fluid constantly seeping from the point where our genitals met, 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.
When men and women experience pleasure during intercourse, vaginal fluid flows out; its purpose is to prevent damage to the vagina from vigorous thrusting.
Look, Li's mother is already 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 typical orgasm! Li's mother is probably experiencing an orgasm right now; it's a woman's happiest moment,"
Teacher Chen explained, then said to me, "Li, you did a really great job today. It would have been even better if you could have ejaculated inside your mother."
Before Teacher Chen finished speaking, I had already started ejaculating.
I held my mother's legs tightly with both hands, and stream after stream of hot semen shot deep into her vagina.
I thrust a few more times and then lay still on my mother's back.
"Wow, Li ejaculated!" "Look how much he's sweating!" The female classmates around me were talking about it.
Teacher Chen instructed me to pull out my penis so the classmates could see my mother's vulva where she had been ejaculated inside.
"Look, this milky white fluid is the man's semen.
When Li's father ejaculated inside Li's mother's vagina, it combined with an egg released from her body, and that's how he conceived."
"Will Li have a child if he ejaculates inside his mother's vagina?" someone asked.
"No," Teacher Chen said, "because Li's mother has already had an IUD inserted."
Then, the mother squatted down, letting the semen flow out of her vagina, before getting up and putting on her clothes.
This sex demonstration class that I had been looking forward to for so long came to an end. I had finally gotten to fuck my own mother's cunt and even ejaculated incestuous semen inside her vagina.

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