My sister and I's sex physiology lesson

page views:1 Publication date:2023-03-24

My Sex and Physiology Lesson with My Girlfriend

My name is Zhi, and I'm currently a third-year student at a fairly good high school in the area. I'm

a poor student preparing for the college entrance exam. Speaking of our school, not only is the school atmosphere conservative, but the teachers

are also very strict. Furthermore, our school uses a male-female class system.

So, my class is entirely male.

In other words, poor me, from the first year of high school until now, almost two years, I haven't had a single opportunity

to get close to girls, even though the class next to ours is a girls' class. The students from both classes rarely interact. Uh…or rather

…we don't dare.

In my memory, there were a few couples who exchanged affections in the corridor, but under the patrol of

the instructors , they all heroically sacrificed themselves for the country.

Since then, no one has dared to cross the line and do anything that the school wouldn't tolerate.

Oh, and by the way, all the subject teachers in my class are men, but what about the teachers next door? That's right, just as you

guessed, they're all women.

This school is just that perverted.

Our classroom was located in the very corner of the campus, practically next to the wall.

This standalone building had five floors. Our classroom was

the second Outside the wall was a large expanse of farmland; looking out the window, I would occasionally see a few farmers

working there, which was my only distraction during class.

Although I was always distracted in class, I consistently ranked in the top three after every test,

so even though many subject teachers often nagged me, they just went along with it.

In class, I was considered quite tall and strong, 182 cm tall and 75 kg,

a perfect proportion. Plus, I was a good athlete, so I had some muscles hidden under my clothes.

Even in a uniform, I looked imposing.

However, because of this, I became the "textbook" for the girls' class next door.

Although the students from the two classes rarely interacted due to school rules... But teachers are different

, so our advisor (note: mentor) often agrees to

some strange conditions and requests from the female teachers next door in order to please them…

Yes, it's about “teaching materials.” Whenever the girls' class next door needs to demonstrate a sport in PE class,

they ask our advisor to find one of their athletes to demonstrate

a move , such as a dunk in basketball or a bicycle kick in soccer…

“Uh… Zhi.” Our advisor patted my shoulder, pulling me back from my

reverie as I was staring out the window, about to dash out.

“Huh? Boss, what's up now?” I asked slowly, coming back to my senses.

"Another assignment."

"What assignment?"

"The class next door..."

"No way..." Before the teacher could finish speaking, I interrupted, "You're going to be a teaching material again?"

"Yeah, yeah, for class later..."

"Please, can't you refuse once in a while..." I said weakly, "Demonstrating is tiring."

"That teacher always makes me do such difficult demonstrations, I'm not even sure I can

succeed 100%."

"Besides, I'm super afraid of embarrassing myself!"

"That class is all girls!" I shook my head vigorously, "Boss, you should find someone else!"

"Oh, you're the most free in this class, and you're the best at drawing, you're the perfect choice!" The teacher

gave a sly smile.

"Oh, no way." I refused decisively. "Don't

worry," the teacher patted my shoulder, "The next period isn't PE, you don't have to work so hard."

"Huh?" Thinking about it carefully, the next period really wasn't PE.

"So what are we going to do this time?"

"The next class is biology."

"Biology class?"

"Yes, biology class."

"As a teaching material?"

"Yes, as a teaching material," the teacher replied, echoing me confidently.

"As what kind of teaching material...?" I really couldn't think of anything difficult in biology that needed to be demonstrated...

"Oh dear, you're asking me? How would I know? I don't teach biology."

"Anyway, just hurry up and report to the next class."

"But I..."

Before I could finish, the teacher pulled me up from my chair, pushed me out of

the classroom, and smiled at me with a smug look on her face. "I'll treat you to lunch!"

That damned teacher, always using me as a tool to pick up girls, using me to gain favor with female teachers.

You don't deserve to be a teacher... You'll be punished by heaven... "Ding-dong! Ding-dong! Ding-dong!"

Just as I was muttering curses at this teacher who sells students for her looks,

the school bell, which I desperately didn't want to hear, rang out.

Oh no, class is starting. Sigh...

Even though I was extremely unwilling, I could only walk step by step to the girls' classroom next door. Wait, something's wrong,

the girls' classroom looks different than usual?

Pink curtains covered the entire classroom, making it impossible to see inside from the outside.

Even though it was sunny today, it shouldn't be so dark inside that we couldn't have a lesson.

Besides, lessons are supposed to be conducted in a well-lit environment...

Filled with questions, I walked to the front door and tried to open it. Strangely, no matter how I twisted

the doorknob, it wouldn't respond. Why was even the front door locked...? "Knock, knock, knock," I gently

knocked on the door. "Snap," the biology teacher opened the door.

"You are...?" The teacher quickly looked me up and down.

"Uh, I am..."

"You're the teaching material sent by the teacher next door, right?"

"Ah, yes."

"Then come in quickly." The teacher pulled me into the classroom and locked the door. I turned to face the class,

and sure enough, my worst fear came true: a group of forty or fifty girls, more than a hundred

eyes staring at me, and a few girls chatting and laughing inside.

My heart started racing. This must be what people call stage fright…

The female teacher walked to the podium, beckoned me to come up.

“Class, do you feel that today’s class is different from usual?” she

said .

“Today we drew the curtains, and we even borrowed a textbook from the next class. Actually, today I

’m adding a little something new to our traditional teaching style.”

“And, I’ve prepared a new lesson today!” The teacher winked at me.

That wink sent a chill down my spine…

The female students below were also whispering amongst themselves, occasionally glancing up at me intently,

and “casually” listening to the teacher. “Isn’t that the guy who demonstrated dunking in PE class?”

“Yeah, he’s good-looking and strong.” “I wish I could be chosen today!” “Oh,

come on, it’s definitely me! Hehehe.”

I vaguely heard conversations like this…

What were they saying? What exactly should we choose?

This adds another big question mark to today's lesson…

While the teacher was preparing to explain today's content, I, standing on the podium, didn't let my eyes rest.

I took the opportunity to carefully scan the female students in the class and found…

the girl named "Wanqi." I'd heard her classmates call her

that and for some reason, I noticed her the moment I first entered this class.

She was very ordinary. But within that ordinariness lay a touch of the extraordinary.

Judging by my estimation, she was about 169 cm tall, slender, and weighed

around . She had long, flowing black hair that shone brightly under the fluorescent lights.

Combined with her oval face and bangs, her large eyes appeared particularly bright.

Based on my observations over the past few times, she's usually not very talkative. Even when many girls were whispering amongst themselves

, she remained quietly seated. So, I think she's the ice queen type.

"Alright, students, please stand here now," the teacher's gentle voice snapped me out of my reverie.

"Oh...okay..." I snapped out of my thoughts and stood beside the podium as instructed.

"Class, I think everyone knows what class we're having today, right?"

"Yes~" The students below nodded in unison.

"Although you were all taught about this kind of thing in elementary school, and some

of you may have even experienced it in middle and high school,"

"but such people are still a minority. And most people have only seen it on TV,

never had the chance to see it in person, let alone experience it firsthand."

"So, today I've been particularly thoughtful and borrowed a boy from the next class to give everyone an

unforgettable memory," the teacher said happily.

"Uh...teacher..." I raised my hand.

"Wait... what am I supposed to do...?" I asked, voicing the question that had been nagging at me since entering the classroom

.

"Huh? Didn't your advisor tell you?" The teacher stared at me, wide-eyed.

"No... my advisor just told me to report here."

"Hmm... it's alright, I'll tell you now."

"Actually, today is a special course I arranged. The course is called..." The teacher suddenly paused.

"What's it called?" I continued.

"Reproduction."

"Reproduction???"

"Yes, reproduction," the teacher nodded.

"From childhood to adulthood, the only knowledge about this subject is taught in elementary school health education about male and female

reproductive organs. After that, no courses cover this

topic is limited to descriptions of small animals or plants."

"Due to the constraints of our societal norms and etiquette, these things are often considered dirty and

corrupting . But it is precisely because of these things, which are not accepted by norms and society, that

countless lives are created. Even so, many young people like you

still have only a superficial understanding of this subject."

"That's why I wanted to incorporate this kind of subject into my lessons

. That's why I invited you here." The teacher winked at me, and as usual,

I shivered…

"So, what should I do next…?"

"Just do as I say," the teacher smiled. "Don't worry too much, okay

?"

"Oh…"

At this point, the audience started to murmur again.

Looking at the expressions on the girls' faces, four words came to mind… “Impatient.”

But Wanqi remained unmoved, quietly sitting in her seat reading.

“Alright, class will begin.” The teacher gently tapped the desk.

“I believe that you all have a good understanding of yourselves, that is, female reproductive organs,

but as for male reproductive organs, I think you probably only have a vague understanding, right?” “Yes, yes!”

the girls below the stage responded in unison.

“Excuse me, could you please take off all your clothes?” The teacher turned to me, standing beside the podium.

No, no way. Take off my clothes?

I've been influenced by Confucianism and Mencius, and my thinking is still quite conservative.

Today, I'm being asked to undress in front of forty or fifty girls? If word gets out, how will I ever face

anyone again…?

Especially if it gets to the class… I'll definitely be in big trouble.

Instantly, I realized my face was flushed and felt incredibly hot.

My heart rate surged to another peak.

"Class, please start from the first row and line up in front of this boy."

After the teacher finished speaking, the students stood up one by one and prepared to leave their seats and move in my

direction, but my hands remained motionless. Simply put, I was so nervous that my whole body was stiff.

Then, the girls lined up in front of me, each with an expectant, nervous

expression , occasionally whispering to each other, nodding and smiling.

I snapped out of my daze and looked at the girl standing in front of me. She was just up to my chest,

looking up at me with a smile.

So...so cute...

that was the thought that crossed my mind at that moment.

"Classmate, I didn't expect you to be so indecisive," the teacher said with a wry smile.

"Xiaoling, why don't you help him take off his clothes?"

"Okay!"

the girl in front of me responded, then placed her hand on the buttons of my uniform on my chest and skillfully

unbuttoned them.

"Uh...classmate..." I was so nervous that I couldn't even speak clearly. I think my expression must be hilarious

.

So, nervously, I stood there by the podium, completely still, letting this female classmate

slowly remove her top. Then, she placed her hand on my chest, slowly sliding it down to my abdomen and belt.

She quickly unbuckled the belt, then slowly slid her hand down to my zipper, gently pulling it open from top

to bottom . Every now and then, she would look up at me with her big eyes.

When our eyes met, her hand, taking advantage of my inattention, slipped inside my zipper and gently squeezed

my penis. I was startled, my body jerked, and she quickly withdrew her hand.

Then she stuck out her tongue at me and gave a mischievous smile. Then she obediently

pulled down my pants and underwear.

At that moment, I could truly say I was completely at ease facing this group of girls…

Damn it, facing this large group of girls, my penis inexplicably became erect.

It was utterly humiliating. "Wow, it's so big!" "Wow~ it looks so dark!" "Look,

it's even red at the front!" "Don't be silly~ that's called the glans!"

The girls couldn't hide their excitement as they discussed my little brother with their classmates. Some girls, I don't

know what they were saying, huddled together and cheered loudly. Instantly, the classroom became

noisy and turned into a marketplace. Faced with this situation, I was at a loss and could only stand there

dumbfounded, grinning like an idiot, letting them use me as a living textbook...

At that moment, I really wanted to find a hole to crawl into...

"Alright, everyone, let's be quiet." At this moment, the teacher slightly quieted down the students

' playful noise.

"Now, according to the order of the line, each person has ten seconds."

"During this time, you can use your hands to touch this student's genitals!"

"However~" the teacher deliberately raised her voice and then smiled, "You can't squeeze it hard!"

Oh my god...

Today I'm being used as a living textbook, being looked at is bad enough, but now I have to be touched too, if this continues, I'll go crazy!

"T-Teacher..." I looked at the teacher, trying to stop her.

But before I could finish speaking, the girl in front of me, named Xiaoling, reached out without hesitation and

grabbed my penis. My body trembled slightly, and my little brother seemed to have been injected with turkey, instantly swelling up

again in her hand . 　　"Wow, so hard!" This girl named Xiaoling rubbed my little brother while looking up at my expression, as if she had discovered a very novel toy, and chuckled. 　　"Hehe," the teacher couldn't help but smile at my nervous expression. 　　"Alright, student, time's up, next one." 　　Hearing the teacher's words, the girl let go of my penis. 　　Then she looked up and gave me her usual smile. 　　In that instant, my heart, which was already racing, accelerated even further. 　　　　　　　　　　　　　And this was just the first one… 　　As soon as the girl let go, my little brother stood erect in mid-air, and after the rubbing, the pink glans was almost completely exposed. My little brother was not only hot, but also trembled slightly with the rhythm, as if greeting these girls… 　　Seeing my little brother like this, these girls seemed even more excited; the words were practically written on their faces… 　　Shortly after the girl in front of me walked towards her seat, the girl behind her quickly stepped and stretched out her devilish hands, starting to grope my little brother, not even sparing the two bags below… 　　And so, my precious thing was rubbed and played with by one thirsty girl after another. I think I should be the first man whose little brother has been touched by more than fifty high school girls… 　　Ten seconds per person, and then the next one takes over, giving me no time to catch my breath. 　　When there were fewer than five girls left in front of me, I breathed a slight sigh of relief. 　　I was just thinking how relieved this terrible dream was finally coming to an end… 　　when suddenly someone appeared who made my heart skip a beat. 　　Yes, it was her. 　　The girl who always caught my eye – “Wanqi”. 　　I saw her gaze slightly upward, her large eyes looking at me timidly. In that instant, amidst my rapidly beating heart, I felt another slight twitch. Unlike the other girls, she didn't stand quietly in front of me with her head down, hesitant to extend her hand. 　　“What’s wrong, classmate?” 　　“There are other people behind us,” the teacher noticed Wanqi's inaction and reminded her. Wanqi slowly shifted her gaze to my face, nodded gently, as if apologizing, and then lightly touched the head of my penis with her index finger . 　　"Hmm..." I couldn't help but sigh... 　　　　　　　　　　　　This feeling... It's so hard to describe... 　　Besides feeling the same as when the girls touched me before, it seems there's something else mixed in, but it happened in this short moment, and even I can't describe the feeling very specifically.

However, one thing is certain: this feeling goes far beyond mere excitement.

"Ah..." Wanqi looked up at me with a guilty expression. "I...I'm sorry..."

Her voice was so gentle...

it felt like...like cotton wool drifting in the air...

"Time's up!" Just as I was about to reply, "It's okay," the teacher beat me to it,

reminding Wanqi that time was up.

Wanqi looked at me, bowed slightly, then turned and quietly walked back to her seat.

This contrasted sharply with the noisy girls below.

I don't know if I saw it wrong, but as Wanqi walked back to her seat, I thought I glimpsed her turning back to look at

me...

And less than a minute later, the girls behind her finally finished examining my little treasure

and happily returned to their seats.

Whew…it’s finally over…

Just as I breathed a sigh of relief, the teacher spoke…

“Classmates, I believe you all understand and have had some initial experience with male genitalia.”

“However, did you know?”

“When a man’s penis receives more and greater stimulation than before, its original length and

width can increase to twice its original size, or even more!”

“For example, continuously rubbing it with your hands, allowing your visual senses to receive more stimulation, etc. Of course,

there are many, many ways to stimulate the penis, too many to list at once.”

The teacher spoke casually with a smile. As soon

as the teacher finished speaking, the girls in the audience started to stir again.

“Alright, alright~ Now, is there anyone who wants to try?”

As soon as the teacher finished speaking, more than a dozen girls in the audience quickly raised their hands. “Teacher~ I want to!”

“Teacher, I…”

“No way!” I turned my head, wide-eyed, looking at the teacher with a surprised expression. “It’s not

over yet ?”

Such voices echoed in the audience, the noisy crowd completely ignoring my

feelings…

Now, I think I can understand how those lab rats feel...

"Hmm...you're the one, Xiaoling!" The teacher beckoned to the first student in the first row, gesturing for her to come to

the podium . It was her...

the first girl to hold and play with my precious thing.

"Xiaoling, now you can do whatever you want, stimulate it properly," the teacher said with a smile.

"Okay!" She nodded, looking at me with a beaming smile.

"Well then, handsome~ I won't be polite."

As soon as she finished speaking, she squatted down in front of me, grabbed my penis,

her thumb rubbing the glans, and then her hand moved up and down, even more

intensely than the first time.

Her other hand was also playing with my duffel bag.

And so, my penis was being played with to my heart's content by a complete stranger.

"Mmm..." I couldn't take the stimulation and made a sound. She seemed to notice my moan

, looked up, smiled at me, then moved her hand to the base of my

penis it, and took my glans and shaft into her mouth.

For a moment, she stirred her tongue around the tip of my penis.

Then, she took my entire penis in her mouth as if she wanted to swallow it whole.

So...so good.

"Ah..." I cried out involuntarily.

It felt like putting my finger in a perfectly warm spa and having dozens of jets

of water spraying it from below.

But the feeling of her sucking on it was even more pleasurable. Looking up, I

saw her sucking on my penis in front of me, and behind her, a group of

girls who had somehow gathered to watch. "Look, his face is so red!" one girl

said, pointing at my face. "Yeah, he should feel really good!" another girl chimed in.

"Hey, how are you feeling right now?" another girl asked

bluntly .

Faced with the questions from a group of curious girls, and with my little brother being sucked by

another

a mix of pleasure and embarrassment, a feeling of wanting to cover my head with a paper bag. This

complex mix of emotions made it impossible for me to think clearly; I could only manage a stupid, bitter smile.

In this situation, my penis, inversely proportional to its owner's feelings, seemed to have reached its peak. My entire penis

felt incredibly numb, and the swollen glans, under her sucking,

twitched with pleasure, making me feel incredibly comfortable. But it seemed as if something wanted to burst out of my

penis. This numb sensation spread throughout my body, and I almost couldn't stand. I

looked at the onlookers with a strange expression, reaching for the podium to steady my swaying body.

"Xiaoling," the teacher, seemed to notice something was off about my expression and quickly patted her shoulder. "That's fine."

As soon as she finished speaking, Xiaoling obediently pulled my penis out of her mouth. Instantly, my

penis felt reborn; the twitching and swelling gradually

subsided after she stopped.

"Hehe, classmate, is this your first time?" The teacher patted my shoulder, as if she had discovered

something .

First time?

If it meant my penis had been sucked by a girl, then it truly was my first time. I'm

usually , let alone discussing them with my classmates, much less having had that

experience before.

And just as it was released from Xiaoling's mouth, my penis was covered in her saliva,

looking wet and sticky…

Its length and radius had also become more than twice as large as usual. "Wow, just like the teacher said, it's changed…"

"Wow, it's so big!" "And it's so straight, almost touching his belly!"

The students watching started discussing my little guy, one after another.

Relieved I didn't think much of it, but unconsciously tried to find Wanqi in the crowd, hoping she

wouldn't look at me with any special eyes. Strangely,

after quickly checking everyone in the crowd in just a few seconds, I couldn't find her.

So, I instinctively looked towards her seat.

That's right... she wasn't watching the commotion with the others, but quietly reading a book.

"Hey, do you have a girl you like in this class?" "

As I searched for Wanqi, amidst the noisy laughter, I vaguely heard the teacher say those words to me.

However, I didn't answer the teacher's question directly. Wanqi sat quietly in her seat, engrossed in her book.

I also quietly watched her through the gaps in the crowd, observing her beautiful and earnest expression.

In that instant, it was as if time had stood still.

'Hehehe,' the teacher chuckled softly beside me, as if telling me: I understand.

'Um…' the teacher raised her voice, calling out to the person I was looking at.

'Wanqi~'

The teacher's call broke the momentary tranquility in my heart and startled

Wanqi, who was intently reading. Wanqi put down her book, looked up, and quietly looked at the teacher, waiting for her to speak.

Her brows seemed slightly furrowed, as if she was afraid the teacher would give her some difficult question.

'Excuse me, could you come here for a moment?' the teacher beckoned, gesturing for Wanqi to stand beside me.

'Teacher, what are we going to do this time…?' I began to feel uneasy. '

Classmates, we are now going to get to the important part of this lesson.'" "

The teacher didn't answer my question directly, but instead addressed the students watching.

'Now, I'm going to show you how humans reproduce.'

'Basically, it involves inserting this male student's penis into the female's vagina and making piston-like

movements. After the penis and glans receive sufficient stimulation, a fluid called semen is ejaculated.

When the semen reaches the deepest part of the uterus, it combines with an egg to become a fertilized egg.'

'The fertilized egg, after a long period of nurturing inside the female's body, will slowly develop into a fetus. Of course, this also

requires the female's biological clock to be in sync.' The teacher said casually.

'T-Teacher!' I looked at the teacher anxiously, but the teacher ignored me.

'Then... Wanqi, please take off your clothes,' the teacher commanded Wanqi instead.

'Wow~ Wanqi, you're so lucky!'" "Great, I really hope it's me~"

The girls cheered wildly, while Wanqi looked troubled, seemingly unwilling.

"T-Teacher..." Wanqi looked at the teacher.

"Could...could another student..."

The teacher shook her head. "Wanqi, it's decided, it's you." "Wanqi, don't be so reserved, hurry up and take it off!

" "Yeah, it's rare for the teacher to prepare this lesson, so you can be the teaching material for everyone."

The students persuaded Wanqi one by one. Wanqi lowered her head, her brows furrowed, as if she was

thinking about something . I think I've probably fallen for...fallen for someone I've only met a few times...When you fall for

someone...you don't want to see the person you like feeling embarrassed because of you...

"Enough! Teacher!" I finally couldn't help but speak up to stop the teacher. "I don't want to be the teaching material anymore!"

"Please don't force her anymore!"

As soon as I finished speaking, all the sounds disappeared. Everyone was quietly looking at me,

as if waiting for me to speak. "Slap."

"I..." Just as I was about to continue, I suddenly heard the sound of a piece of clothing falling to the ground. In

the complete silence, the sound was even clearer. Instinctively, I looked to my right, and the image of a

pure white bra supporting a pair of fair breasts immediately came into view. Wanqi's eyes were slightly

tearful, her brows furrowed in sorrow, and she looked extremely aggrieved.

She gently pulled down her skirt, revealing pure white panties and long, slender legs, completely exposed

before me. I shook my head at her, telling her with my eyes: You don't have to do this...

She looked at me with her large, slightly tearful eyes, and then gently nodded. Nodding, "Do you agree

?"

At that moment, only that question occupied my mind. Watching Wanqi slowly undress, the students began

to make noise . After her bra and panties were removed, the classroom now had another

person, like me, completely naked before everyone.

I just hadn't expected it to be Wanqi. I turned to look at her; her slightly full breasts and

pink nipples were incredibly alluring.

Her fair and slender legs were completely exposed before me.

A small slit was hidden among her thick pubic hair.

Seeing this, my already erect penis became even harder and more erect.

"Wanqi," Teacher walked to the table in front of the podium, placing her hand on it. "You can sit here."

Wanqi glanced at me, then slowly walked to the table the teacher indicated. Following the teacher's

instructions , she shifted her weight behind her, supported herself with her hands, slightly spread her legs, and sat down on the table.

"Student," the teacher looked at me, pointing towards Wanqi, "Come here."

Even though I was extremely unwilling, I obediently followed the teacher's instructions and

walked .

"Come closer," the teacher pulled my hand and pushed me towards Wanqi's side.

"Now, please use your hand to massage Wanqi's clitoris properly," the teacher said, pointing to

the tip of Wanqi's clitoris. I gently placed my finger where she indicated, and Wanqi's body

trembled slightly upon my touch. I glanced at her and noticed her fixed gaze on me, her

pitiful appearance making me feel a pang of sympathy. I gently applied pressure to Wanqi's clitoris, then massaged it by

moving , occasionally rubbing the slightly swollen tip.

"Ah..." Wanqi frowned, her face flushed with embarrassment, as my massage, sometimes firm and sometimes gentle, caused her to tremble slightly.

She must be feeling good, right? That's what I thought.

So, I bent down even further, resting my head between Wanqi's legs, and began

massaging her vulva with my mouth and tongue.

Following her breathing rhythm, I used my hands to part the small opening, rubbing Wanqi's labia minora with varying speeds

. This continued for quite a while.

"Mmm..." As if she had just finished exercising, Wanqi's breathing

became Hearing Wanqi's panting, I felt a strange urge, and this urge directly manifested in

my penis.

As if matching Wanqi's heartbeat, waves of warmth made it vibrate involuntarily.

I parted Wanqi's labia and, besides seeing the moist vaginal opening, I also saw a thin membrane that wasn't completely

closed , with several small holes in the middle.

Just as I was carefully examining Wanqi's private parts, the teacher gently patted my shoulder, then leaned close to

my ear and whispered a few words.

"Student, you're very lucky."

I looked at the teacher, a questioning look on my face.

"Wanqi is a virgin, just like you."

"First...first time?" I murmured in surprise. The teacher smiled but didn't answer, simply turning her head away

and giving me instructions in front of everyone.

"Student, now please gently insert your penis into Wanqi's vagina and then

rub " After she finished speaking, everyone in the classroom was almost at their peak of excitement, even noisier than before.

"I..." I looked at Wanqi, and Wanqi looked at me too. For a moment, our eyes met, and I didn't know what to

say to her. I held my already rock-hard penis and slowly placed it at the entrance of Wanqi's vagina, rubbing it

up and down , letting Wanqi's love juice wet my glans.

I could almost feel Wanqi's burning lower body through my glans.

"Sorry..."

I gazed at Wanqi, then slowly slid the head of my penis into her vagina. I shifted my body

slightly, leaning my lower body forward, and my entire penis was inserted into Wanqi's pink vagina.

So...so tight...so warm...

My penis was enveloped by Wanqi's vagina, my body temperature and hers were

connected.

"Ah..." Just as my penis was fully inserted, Wanqi exclaimed. I looked up at

Wanqi; she was tilting her head, staring blankly at the empty space below the podium. I could vaguely see her flushed

cheeks and hear her soft breathing. I gently pulled my penis out halfway, then gently

inserted the entire length, filling Wanqi's vagina, and then, according to my own feeling, began a piston-like motion

. So comfortable...

So this is what sex is like...

In front of forty or fifty girls, under such helpless circumstances, I was having sex with a girl I'd never spoken to

, someone I'd only met a few times, someone I couldn't call a classmate or friend. And this girl was none other than

Wanqi, the pure and innocent girl in my heart.

"Mmm...mmm...mmm..."

Wanqi stared blankly at the ground, making sounds in sync with my thrusts. Her body

swayed slightly with my movements, and my slightly reddish penis

rubbed against her vagina, making sounds. "Plop, plop, plop,"

the more intense the penetration, the louder the blood-pumping sounds became.

Wanqi's breathing also became rapid with my vigorous thrusts.

Not long after I increased the speed, a tingling, numbing sensation spread from my penis throughout my body in an instant.

My penis...it felt like something was about to burst out again, and that

feeling of almost losing my balance returned.

I looked at Wanqi's face, and Wanqi, as we swayed, turned to look at me.

"Ah...ah..." I finally couldn't bear the pleasurable tingling sensation and couldn't help but cry out.

"Ah...ah...ah...ah..." Wanqi seemed to be almost at her limit too, crying out just like me.

Was she feeling the same way I was?

I held Wanqi's slender waist with both hands and suddenly accelerated my movements,

thrusting back and forth in Wanqi's wet and tender little hole, then let out a heavy sigh.

"Ah!"

Just after I cried out, I inserted my little brother into the deepest part of Wanqi's little hole, and Wanqi's body trembled

violently .

"Hmm!" Then, after me, Wanqi gasped.

And so, my little brother remained at the deepest part of Wanqi's body, and with each spasm,

I ejaculated white fluid inside Wanqi's body. Wanqi, who had been sitting on the table, supporting herself with her hands, finally collapsed weakly onto the table

after my semen was ejaculated inside her . 　　But her lifeless gaze remained fixed on me. 　　A touch of sorrow, a few glistening tears, filled me with a strange sense of guilt. I gently withdrew my penis from Wanqi's body, some of the semen flowing from her vaginal opening down to her crotch… Shortly 　　after my ejaculation, the school bell rang. Amidst 　　the noise, Wanqi and I put on our uniforms without exchanging Then, as before, she quietly and slowly walked back to her seat, her deeply furrowed brow still visible beneath her bangs… 　　After that, the girls in the next class, my homeroom teacher, and the biology teacher never mentioned it again. Of course, apart from those present at the time, no one else knew about it; it was as if… a dream. 　　But from then on, Wanqi was never seen at that school again… 　　What happened to her? 　　Did she transfer schools because of me…? 　　"..." 　　Sitting by the window, watching the farmers working in the fields, with less than a month until the joint entrance exam...

Suddenly, I remembered her again. We never spoke, we couldn't be considered classmates or friends, we were like complete strangers, yet

we had once been together... We shared each other's body temperature, the same feelings... Our bodies were once tightly

connected ... She... still has a trace of my body temperature inside her...

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My sister and I's sex physiology lesson

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