[Junior High School Physics and Chemistry Course] (09) Author: rescueme

Author: rescueme
Word count: 10632

(08)

In the last physics and chemistry class, Tang Chenwei was surprisingly "well-behaved". It seemed that his mother
appeared in class and not only was her breasts seen by the classmates, but some classmates also took the opportunity to play with
her super big breasts of F cup while practicing CPR. On the one hand, it was also because he confessed to Li Zhenzhen in a gentle tone that he
had never seen a girl's genitals. This was equivalent to indirectly admitting that his previous boasts about his good performance in bed were just lies.
I thought he would restrain himself a bit, but I didn't expect to hear his words in math class. This made me worry about Li Zhenzhen
's chastity again.

"What? I'm a virgin? Please, how can I have a chance to sleep with the teacher if I don't say that?" When Tang Chenwei was ridiculed
by , he lewdly said his desire for the teacher, and pretended that
the masturbation and premature ejaculation in class that day had never happened.

Even though the tide has receded and his pants have been washed away, he's still stubbornly refusing to admit it. He couldn't even last two minutes
masturbating , yet he dares to claim he's sexually proficient. If I weren't so cowardly,
but instead had a bunch of idiot friends like Chen Yuhao, seeing him so utterly exposed yet still
desperately denying it, I would have slapped him long ago!

It's almost time for our week's physics and chemistry class, and today the teacher is dressed in a very revealing low-cut top, slightly
showing the top of her green bra. Her ethnic-style floral long skirt looks quite dignified, but upon closer inspection
, it's practically see-through; if she bends over, her pinkish-green underwear is clearly visible!

She wasn't dressed like this near the counter just now! She must have changed specifically for our class,
otherwise, the parents would have complained long ago.

The teacher turned on the interactive whiteboard as soon as she came in, continuing the lesson on wave theory from last week. I
glanced at Li Fa; her half-smile turned sour when she saw me. Haha, that
means she's temporarily lowered her guard. After all, we're already good friends who've seen each other's bodies, very good.

"The generation of a sound wave requires an object to vibrate rapidly in a medium, and one vibration contains
four amplitudes." The teacher drew a diagram of a particle vibrating continuously up and down on the whiteboard and played a Flash
animation to help us understand. Even someone as brain-dead as me could understand it, so I don't believe anyone else couldn't.

"Teacher, does that mean four amplitudes?" Chen Yuhao clenched his fist, making
the mischievous gestures boys usually do in their rooms, gesturing up and down.

"Yes, the movement from the equilibrium point upwards to the highest point, then downwards back to the equilibrium point, then downwards again to the lowest point,
and then back to the equilibrium point completes one wave; conversely, it can also start from the equilibrium point to the lowest point, or even not
from the equilibrium point, but from the highest or lowest point, as long as the vibration of the medium passes through 4 amplitudes
." The teacher smoothly explained the process of a complete wave, while simultaneously
making up-and-down movements with her palm on the classroom floor, appearing gentle and charming, completely different from the lewd actions of Chen Yuhao.

I originally thought that Chen Yuhao was going to pretend to be innocent again and continue to try to get more benefits from the teacher, but unexpectedly, the teacher
walked over and casually placed her palm on Chen Yuhao's crotch. Chen Yuhao didn't expect things to happen so suddenly,
and instinctively shrank back, then stood still, his eyes shining as he wanted to see what the teacher would
do .

Although Ms. Li Zhenzhen didn't want people to question her professionalism, taking off one's own pants and taking off someone else's pants
are completely different concepts. She still put in some effort to remove Chen Yuhao's outer pants, then his
underwear , revealing his still-soft penis.

"In terms of your masturbation movements, a complete vibration, if you take the mid-section of the penis as the balance point,
is starting from the penis, moving forward to the glans, then back to the mid-section, then sliding to the base, and then
returning to the mid-section." The teacher casually picked up Chen Yuhao's
penis, which wasn't much bigger than mine, and moved it back and forth.

"Teacher, sorry, I can't see very clearly. Could you please make it bigger first?" Chen Yuhao
glanced at Ms. Li Zhenzhen, who was squatting on the ground explaining, and asked.

Damn it, isn't that your own penis? You can't even see it clearly! I think the teacher should just casually rub it a few times
to get it erect; there's no need to be too nice to him.

Looking back on the lessons so far, the teacher has only given me oral sex in class, and even had her
vagina penetrated by my penis in private. Not to mention, I've ejaculated into her vagina in front of the whole class. She
belongs to me, and the teacher should respect her position; she wouldn't do anything too outrageous, right?

"Hmm." After saying that, the teacher unhesitatingly stuck out her tongue and skillfully licked Chen Yuhao's glans. It was like
a bolt from the blue!

What? I thought those sabis that belonged only to me were taken away in the blink of an eye! The teacher's soft
tongue was actually licking the filthy outlet from which a brat ejaculates semen and urine every day, not to mention that filthy opening
belonged to a scoundrel who had bullied me for years! ?

Thinking about it, it's not too surprising. After all, even a teacher like me, a perennial furnace master, is willing to sacrifice my body for guidance. In terms of return on
investment , those high-achieving students have more reason to possess the teacher's body. Besides, the landlady, Sister Yu,
said last week that as long as the teacher doesn't mind, she won't interfere with the teaching methods at all. She even hopes that the teacher can let them achieve multiple
goals in class, such as learning physics and chemistry, satisfying their curiosity about the opposite sex, releasing excess energy, and saving
time for watching porn at home. In that case, it's only a matter of time before the teacher's vagina is violated by other beasts.

However, I still can't let it go. I used to be at the bottom of my class, and after finally getting into the second year of junior high, I managed to be the first to receive
oral sex . I even secretly slept with the teacher under the guise of tutoring, losing my virginity in a cool way, and achieving
the achievement of being the only one to ejaculate inside the teacher's vagina. All of these feelings of superiority have vanished, replaced by an even greater
sense of humiliation than before, especially when I see the dazed look in the teacher's eyes.

The teacher, eyes squinting, licked Chen Yuhao's penis, sometimes taking it into her mouth, sometimes just sticking out her tongue
and licking it quickly. She stretched her tongue as far as she could, like an AV actress, Shizuka Kanno. This teacher
was no longer the beautiful, gentle, and kind Li Zhenzhen of the past; she resembled the succubus
Sajupa !

Finally, this painful time didn't last long, and Chen Yuhao's penis was already erect. The teacher simply stopped...
Instead of demonstrating with her hands, she had Chen Yuhao stand on the table, while the teacher squatted slightly on a chair to adjust the height difference.
Then, she began to perform the so-called "complete vibration" with her mouth.

"Look carefully, the teacher's mouth now starts from the tip of Chen Yuhao's glans. When you finish one vibration,
please shout 'Stop!' so the teacher knows if you've learned it." After finally stopping, the teacher
lightly touched the area near Chen Yuhao's urethral opening with her lips, then parted her sexy, bright red lips slightly and slowly took Chen Yuhao's approximately 12-
centimeter penis into her mouth, inch by inch, until her lips were tightly pressed against Chen Yuhao's pubic hair, with only his testicles sticking out. I wondered if the teacher's throat was that long? She managed to keep Chen Yuhao's entire hard penis in her mouth
with ease . Then, the teacher paused for a moment to make sure no one thought this was a complete vibration before slowly spitting out Chen Yuhao's penis, revealing his ugly, lewd penis that was already wet with the teacher's saliva . "Stop!" The classmates shouted the order to stop in unison. I yelled "Stop!" especially loudly. By this point, I understood what one vibration meant—four amplitudes. Please, don't continue. It will hurt my young and innocent heart. "Next, we'll start from different parts. Students, shout 'Stop' after completing one vibration." The teacher 's mouth was full of saliva and Chen Yuhao's disgusting urine stains, making her words unclear. Then the teacher put her mouth on Chen Yuhao's penis again , but this time she swallowed half of it. Then she started to back up until Chen Yuhao's penis was fully exposed, then she swallowed the whole thing, then back up again... "Stop!" Huh? The deafening shouts of the whole class woke me up. I realized I was so focused on the teacher's oral sex that I hadn't noticed she had already completed one vibration. I suddenly felt so sad I almost cried. If it weren't for the whole class answering together, but only me, wouldn't Chen Yuhao have taken advantage of the teacher for a while longer? And here I was, saying I wanted to protect the teacher's body, but an idiot is an idiot—I didn't help the teacher at all. With tears in my eyes, I continued watching the scene of the tutoring class's physics and chemistry teacher giving oral sex to the gang leader. Li Fa glanced at me, showing a somewhat empathetic and sad expression. I nodded and smiled slightly at her, thanking her for her empathy. However, she was very reserved in class. Although she had joined in the clitoral stimulation last time, she rarely spoke, and today she didn't say anything when she should have called for a stop. This time, the teacher started from the base, letting Chen Yuhao's entire penis fill her mouth from the beginning, then gradually retreating until the entire penis was exposed before advancing again, until Chen Yuhao's penis was once again pressing against the teacher 's throat. This time, apart from me choking back tears and whispering a call to stop, the whole class surprisingly kept quiet. Even though this was supposed to be one cycle after full penetration, no one called for a stop. Teacher Li Zhenzhen thought it wasn't full enough, so she frowned and forced her mouth closer to the base of Chen Yuhao's penis until she realized her lips couldn't go any further, and her uvula was being pushed against the glans until tears streamed down her face. Only then did she slightly withdraw the penis from her mouth. Teacher Li Zhenzhen knew her classmates were teasing her, deliberately not calling for a stop, but to maintain a good atmosphere with the class, she pretended not to know and continued to diligently perform oral sex on Chen Yuhao, repeatedly letting the glans of his penis thrust in and out of her lips with a "pop pop pop" sound. I think it had already been more than ten cycles! "Stop! Stop! Stop!" I yelled stupidly, trying to interrupt this scene . Hearing my voice, Ms. Li Zhenzhen finally "popped" Chen Yuhao's swollen, purple glans away from her lips. "Now you finally know what a complete vibration is, what a cycle is, what four amplitudes are, right?" Ms. Li Zhenzhen wiped her mouth smugly. After all, she had demonstrated these easily confused concepts perfectly through her body . Aside from the moralists who might have some objections, students everywhere had to admire her dedication and professionalism. Not to mention that time when the whole class ganged up to tease her, she neither got angry nor panicked. Even I had to admire her for that, even though I still felt a slight sadness because she had given oral sex to someone else. "Teacher, we didn't see it here." Huang Ruoli suddenly attacked at this moment. Please, the teacher has been sucking it for so long and you're only saying you didn't see it now? You son of a bitch! "Okay, this time I won't let you stop. I'll demonstrate each pose twice consecutively , starting from the highest point, the lowest point, and the balance point. Can those of you who didn't see it pay close attention?" The teacher had indeed overlooked the students in my position, and because I didn't want to look too closely, I hadn't noticed. I knew Huang Ruoli was using this as an excuse, but the teacher should have tried to prevent her from finding fault. "Hmm..." So, while giving Chen Yuhao oral sex, making his penis move in and out of her mouth, the teacher also had to keep an eye on the students in my position, counting "1, 2, 3, 4, 2, 2, 3, 4..." to indicate that one vibration required four amplitudes. While the teacher was looking at Huang Ruoli seductively, Chen Yuhao glanced at Huang Ruoli in approval, then closed his eyes and enjoyed the teacher's service. Teacher, look, they're all in cahoots! They're not as eager to learn as I am; they just want to bully you! "Is that enough?" After the last swallow, the teacher gently pulled the glans away from her lips with a "pop," wiped her mouth and asked. Whether from exhaustion or arousal, her cheeks flushed, and the constant stimulation of the penis on her throat caused tears to well up in her eyes. Chen Yuhao, somewhat dejected, pulled up his pants . "Teacher, you can't see from here either." Damn, which crazy woman was talking nonsense? But I immediately recognized the source of the voice—it was Li Fa!? I thought we were on the same side, why…you!? " Okay, any other students who haven't seen it, please come over here, okay? We've been delayed in our lesson." The teacher then continued to half-squat in front of Chen Yuhao. Chen Yuhao thought this perk was over, but Li Fa had unexpectedly secured another round for him. He happily winked at Li Fa, but Li Fa completely ignored him. Damn Li Fa, you should go work as a hairdresser in a "pure" barbershop when you grow up, and let you cut hair!

"Go for it!"

So, Teacher Li Zhenzhen once again took Chen Yuhao's glans, which was frighteningly large compared to its pre-erect state, into her mouth,
repeatedly swallowing and spitting it out. Although I didn't want to see this horrific scene, I still hoped that more
people watching would scare Chen Yuhao's penis into softening, so I also went over to watch the teacher's oral sex demonstration up close.

Oh no! Even the student with the best stamina, after being served like this by the teacher's skilled oral techniques for so long, it would be strange not
to ejaculate ! Teacher, please don't take it too seriously, just a little bit is enough, hurry up and continue the lesson!

Sure enough, with this round of demonstration, Chen Yuhao
closed his eyes As the teacher's oral sex countdown began, he also started to tense his legs excitedly.

"Tsk, tsk, tsk..." The teacher sucked on the penis with a smacking sound, and Chen Yuhao's brows gradually furrowed.
It's okay, only two more times left, Chen Yuhao, hang in there, Teacher Li Zhenzhen, just suck it a little bit, everyone hurry up and go home,
I'll treat you to a late-night snack!

Just as the last vibration was about to be completed, the teacher took Chen Yuhao's penis all the way in,
even making a "plop" sound as her lips hit her perineum. Then Chen Yuhao's brows relaxed, and he started to tremble
his scrotum, obviously he had ejaculated!

It's okay, the teacher still has time, quickly spit out the head of his penis. My feelings were like a parent whose child has accidentally swallowed a button
battery , and I was thinking to the teacher to spit out the foreign object in her mouth.

The teacher noticed the penis ejaculating in her mouth, and the pungent smell of semen made her quickly press her hands against
Chen Yuhao's inner thighs, then jerked her head back, trying to spit out the penis and semen.

However, Chen Yuhao was incredibly audacious; he tightly gripped the back of Li Zhenzhen's head with both hands
. Although he was only a middle school student, the strength of the teacher's neck was no match for the pressure of her hands, especially since Chen
Yuhao had been training in fighting.

So I watched closely as Li Zhenzhen, tears welling in her eyes, widened in terror, like the face on the
poster for the first Scream movie. But while the beautiful woman on the poster only had her mouth open, our Li Zhenzhen
's mouth wasn't just open; it also had an ejaculating penis inside, full of semen!

"Oh, so good…" Chen Yuhao, lost in the moment, ejaculated while holding the teacher's head,
pouring into her mouth, possibly even spraying it down her esophagus. No way! My first-year biology class taught me that the stomach
is acidic, but last time the teacher told me that male semen is alkaline. Wouldn't that mean acid-base neutralization releases
heat ?! Won't the teacher's stomach be very uncomfortable?!

Thinking this, I practically cried as I ran out the door, grabbed a
soda from the vending machine at the tutoring center, and rushed back to the classroom. The teacher's mouth was still on Chen Yuhao's penis!

Finally, when Chen Yuhao was satisfied, he released Li Zhenzhen. The teacher immediately
coughed, as if choked by the semen, bending over and making strange noises.

That damn pervert! He used class as an excuse to blow-feed the teacher! And the worst part is Li Fa, it's none of your
business, yet you're causing trouble! Don't give me a chance, or next time I'll definitely fuck your little
cunt raw! Who told you to be so stupid? If it weren't for you, the teacher wouldn't have choked so badly on the semen!

I quickly handed the soda to the teacher, who frowned and glanced at me. "What?"

"Semen and stomach acid will neutralize each other. Teacher, quickly use this acidic soda in your mouth to neutralize it first, so
your stomach ." Actually, before I ejaculated inside the teacher, I had no idea about "acid-base neutralization."
Hearing this term, the teacher naturally remembered our forbidden encounter. Blushing, she accepted my soda and immediately
took a few sips, hoping that even if it didn't neutralize the acid, at least the taste of Chen Yuhao's semen wouldn't
linger in her mouth for too long.

"Chen Yuhao, you…" The teacher was about to accuse him of disrespecting women and forcing oral sex when this guy
started acting again, preemptively shedding tears: "Teacher, I'm sorry, I've never ejaculated before. I suddenly
felt very comfortable, so I couldn't help it, sob sob."

Damn, Tang Chenwei and I have both used this trick. Each of us claims to be a virgin, thinking that will generate
a lot of semen, right?! Actually, it's quite effective. As a kind-hearted
older sister—no, I mean, a very understanding older sister—Teacher Li Zhenzhen is almost always willing to fulfill our needs, as long as they're not too outrageous and
have to be related to the course. Therefore, I really need to study physics and chemistry well so I can intervene at crucial moments. I absolutely
don't want to see the teacher's little hole being penetrated by someone else's penis!

"What I just demonstrated was the movement pattern of wave motion. Next, I'll explain the generation of sound waves." The teacher
tidied her makeup and continued the lesson.

"For a sound to form, an object must vibrate rapidly in a medium, and the frequency must be moderate. Too high
or too low, and you won't hear it. Of course, the human ear must function normally; the frequency received by the eardrum is the frequency of the sound,
which is the frequency of the vibration source." The teacher then showed pictures of an experiment by the Irish chemist Boyle. He
evacuated the air from the glass jar, and although the alarm clock inside was still vibrating, no sound was emitted.

"This proves that sound needs air as a medium to travel, but in fact, you can
still , which means that gases, liquids, and solids can all be used as mediums for sound transmission," the teacher continued
.

"Teacher, is this vibration fast enough?" Huang Ruoli, pretending to be mentally challenged and addicted,
immediately stood on a chair after hearing the teacher's explanation and made the signature "air sex" gesture of Asian video king Show Lo, exaggeratedly twisting his waist and
making a motion of air sex.

He was seen having air sex with the teacher's almost transparent skirt at about 5 times per second. According to
the concepts we have learned, this frequency is about 5 Hz. Although Huang Ruoli was wearing pants, his large bulge
was clearly visible. It was just that the teacher was dressed too sexily. Not only did her upper body reveal a deep cleavage, but her skirt
was almost like she wasn't wearing anything at all. The style of the teacher's underwear was almost visible at any time. It was a thin green girl's underwear.
If you looked closely, you might even be able to see the faint pubic hair.

"Not fast enough. The vibration frequency must exceed 20 Hz to make a sound." The teacher
smiled and dismissed his efforts, seeing his movements that were only a hair's breadth away from being mentally challenged.

"How about this?" This time, Tang Chenwei tried his best to wiggle his butt, but I knew that even if an electric butt shaker like
Ricky Martin , it would be impossible to reach a frequency of 20 vibrations per second.

"Impossible. The human ear can hear frequencies between 20 Hz and 20,000 Hz, and
the range of frequencies we can hear decreases with age." The teacher watched the group of kids trying out different hip-swaying
movements , and although he knew they were fantasizing about him to some extent, he still laughed until he was doubled over.

"Buzz buzz buzz..." The teacher's lecture was interrupted by a sound.

"What's that sound?" The teacher stopped, his smile freezing, trying to find the source of the sound. The
"buzzing" sound sounded like vibration. Could someone have reached a vibration frequency of 20 Hz, emitting sound waves that the human ear could
hear ?

"Hehe, the teacher was right, you can only hear things above 20 Hz." Tang Chenwei chuckled and
took out a small, pink object, no bigger than an eraser, from his pocket.

Then he adjusted the remote control in his hand, and the small object vibrated rapidly one moment and
jumped slowly the next. The teacher's cheeks turned red rapidly after seeing the object. Damn, could that thing be
a vibrating egg adult toy?!

I remembered writing "flea" as "vibrating egg" when I was in junior high school biology class. When Yu-jie checked the communication book, the biology teacher
found it and made me write "flea" 100 times as punishment. She called me over to question me,
and I honestly admitted that I had written "vibrating egg" instead of "flea" during a school quiz. Yu-jie's cheeks were almost as red as Ms. Li Zhenzhen's
now . Later, I asked my classmates what a vibrating egg was and got a vague answer. Now, seeing
the real thing, I finally understand.

"I turned it on at 10Hz and 15Hz and the teacher didn't hear me, but as soon as I turned it on to 20Hz, she heard me! Sure enough, 20Hz
is within the range of human hearing!" Tang Chenwei happily placed the vibrating egg on the table, letting it
vibrate.

"Can you put it away now?" Ms. Li Zhenzhen asked expressionlessly. I thought she would get angry;
however, strictly speaking, although Tang Chenwei taking out the vibrating egg was inappropriate, it was related to the lesson, and
it wouldn't make sense for the teacher to suddenly get angry.

"Teacher, is a girl's vagina normally closed?" This time, it was Zhen Shuzhu's turn to ask,
interrupting the awkward moment.

"Why are you asking that?" The teacher was already getting angry; this seemingly delicate and pretty
private school beauty had asked such a strange question, and it looked like the teacher was about to explode!

"I just find it strange. If you put a vibrator inside the vagina, wouldn't the vibration be heard?
Why do so many erotic novels say that the heroine puts a vibrator inside her vagina and walks around enjoying shameful play without being
noticed by passersby? It's so illogical!" Zhen Shuzhu's straightforward, even indignant, question
softened Teacher Li Zhenzhen's expression slightly. She continued, "Hmm, it is indeed illogical. A vibrator
can vibrate as long as there is a medium, and it's possible for it to make a sound inside the vagina."

"Then could you please demonstrate, teacher?" Zhen Shuzhu pretended to be shy and lowered her head, which was more
in line with her status as a school beauty. But I knew very well that she, who usually liked to make lewd jokes, wouldn't be shy about something like this!

"Why don't you try it yourself?" the teacher demanded, her face stern.

"I'm still a virgin..." Zhen Shuzhu uttered a sound barely louder than a mosquito's buzz.

I couldn't refute that, but I figured she was probably a fake apple disguised as an Australian pear, a Black Widow pretending to be a king crab.

"Teacher, we're also curious if sound changes in nature after passing through the human body.
Show !" Chen Yuhao and Tang Chenwei seized the opportunity to stir things up. But thinking about it calmly, the vibrator was brought by them,
and everything was unfolding exactly as they had planned. The teacher couldn't possibly let them have their way!

"Well, I also wanted to explain to everyone how vibrations change when passing through different media, so I
'll reluctantly demonstrate it for everyone." After careful consideration, the teacher decided to insert that seemingly
cute but incredibly powerful toy into her body in front of everyone!

The teacher took the vibrator and wireless remote from Tang Chenwei, then simply lifted her skirt, took off
her underwear , and sat on the empty table she had been using to put things on, legs spread wide in an M-shape.

I saw the teacher's long legs bent in the most lewd posture, her lower body already restless. When I
looked at her darker genitals, I saw that her labia minora were engorged and spread open,
the opening slightly exposed, the surrounding area moist and reflecting light. My penis was already erect in my pants.

"Everyone, listen to the sound at 20Hz, this is the control group." The teacher held the
thin string , letting it vibrate in the air, and you could definitely hear the sound.

"Next is the experimental group, please listen carefully." The teacher leaned back slightly, nervously lowered her head, parted
her most private parts, and then inserted the vibrator into her vagina.

"?" "Quiet!" Tang Chenwei excitedly told everyone not to make any noise.

"Did the teacher turn it on?" As the vibrator lewdly burrowed into the teacher's pink flesh hole, completely buried
in the layers of her vaginal walls, with only a thin string showing, we didn't hear a sound.

"It's on." The teacher frowned, her voice trembling.

She pulled the vibrator out halfway, leaving only half of it protruding from her vagina. We then
heard the buzzing sound again and witnessed firsthand how the vibrator stimulated her thin labia, making the two petals
tremble with a sexy, bouncy motion.

"If you don't believe me, touch my stomach," the teacher pleaded, trying to end the
experiment quickly. She wanted us to touch her lower abdomen to see if we could feel the vibrations coming from her vagina.

She deliberately phrased it subtly, saying we should touch her stomach, but
the vibrations closer to the vibrator. However, being a gentleman, I first touched her hands. She
was currently spreading her thighs to allow students to observe the changes in her genitals, and sure enough, there was no movement.

Then, the students hurriedly placed their hands near the teacher's lower abdomen, especially between her pubic hair and navel. Several
perverts simultaneously reached in, and sure enough, they felt a very strong
vibration .

"Really!" Zhen Shuzhu shouted excitedly. Even though she couldn't hear a sound, she could feel
the vibrations in her teacher's stomach. She happily raised her hands, making her B-cup breasts stand out even more through her school uniform shirt.

"No, I need to confirm it," Tang Chenwei snatched the remote control from the teacher's hand, while the teacher...
The most vulnerable spot was enduring an attack so intense it left her speechless, and her hand slipped, allowing Tang Chenwei to snatch the remote
.

"It's really on!" Tang Chenwei saw the LED display on the remote and incredulously turned up the frequency
. How did I know? Ah, Lin Bei's hand was on the teacher's mons pubis!

"Remember, students, the frequency doesn't change when waves penetrate different media, but..." The teacher frowned
as if enduring immense pain, but actually, it was because Tang Chenwei was mischievously switching frequencies, and the teacher was probably already
reaching her limit of pleasure.

The old woman's vagina was already enduring a high-speed attack that even Kato Taka couldn't match, and some students even took advantage
of the chaos to grope the teacher. I noticed Huang Ruoli's hands improperly touching the teacher's clitoris and
labia , while several of Chen Yuhao's followers were stroking the inside of the teacher's thighs; some even tried to insert their fingers
into the teacher's vagina and anus, but I slapped them away, and
countless , and the teacher was thus groped dozens of times.

"Wait, wait!" A sudden flush spread across the teacher's fair collarbone and thighs, interrupting
her explanation. She leaned back, pleading with Tang Chenwei to stop.

However, Tang Chenwei was enjoying the pleasure of humiliating his teacher and had no intention of stopping. He retreated far away from her
and continued adjusting the remote control until she couldn't take it anymore and hastily pulled the vibrator out before losing control
. The deafening buzzing sound made us realize just how powerful this little guy was!

The teacher glared at Tang Chenwei, then continued, panting, "When a wave passes through different media, the frequency doesn't
change. So when Tang Chenwei turned up the frequency, you could hear it through my stomach. However,
the amplitude, wavelength, and wave speed changed. In the air, because the amplitude is large enough, you can hear the
vibrating egg. But inside my body, although the vibrating egg still vibrates, firstly,
there's no air as a medium inside my vagina, so I can't hear the buzzing sound like in the air; secondly, the amplitude isn't large enough.
The energy egg isn't enough to disturb my body and produce a large enough amplitude, so you can't hear the sound."

Despite her panting, the teacher still managed to explain everything clearly in one breath. It seemed she had heeded the advice of
that sly, fat Jiang Wangcheng, turning crisis into opportunity.

"Teacher, could you demonstrate again?" Tang Chenwei pleaded, handing over the remote control
, wanting to show his sincerity—he "really" just wanted to learn.

"Hmm." This time, the teacher first placed the vibrating egg near the clitoris and labia minora, letting the students see clearly that
if it were a thin object like the labia minora, the vibrating egg could transmit energy to cause them to vibrate at a high frequency and also
make a buzzing sound. However, I think even if the labia minora vibrated at a few seconds, it shouldn't make
a sound, otherwise it would be too incredible!

Then the teacher couldn't wait to insert the vibrating egg into her vagina. This time, without Tang Chenwei's interference, she
could actively control the frequency. She quite enjoyed using the guise of demonstration to openly masturbate. She
slowly increased the frequency and occasionally pulled out the vibrating egg to stimulate her clitoris.

"Hmm..." The teacher's muffled groans became more and more obvious under the students' indifferent attitude. She
squinted her eyes, frowned, and sweat slowly slid down her temples. Her body
trembled slightly, whether from the vibration of the vibrating egg or from her own pleasure.

"To the students who came for tutoring last week, I'm going to test if you've learned how to vibrate. Xiaoping, you
stimulate my nipples at a high frequency." The teacher didn't even glance at me before pulling down her shirt and unhooking her front-opening
bra , revealing her slightly swaying, fair breasts.

Of course, I was more than happy to oblige. I quickly stepped forward, gently flicking the teacher's pink nipples with one hand each.
Those pink tips were already erect, no wonder people call them "pepper nipples." Even though the teacher's breasts were so large,
her nipples were still slightly upturned like chili peppers, their color a fiery red full of lust, and their shape so cute that one
wanted to put them in their mouth. However, some people say that pepper nipples refer to the fragrance like Sichuan peppercorns. I haven't licked them, so
I dare not make a judgment.

At this moment, without my defense, the teacher's clitoris had already surrendered. Huang Ruoli parted the teacher's clitoral
foreskin and lewdly rubbed the teacher's little bean. Afraid of being discovered by the teacher, he licked the corner of his mouth while rubbing the teacher's
clitoris, all the while watching whether the teacher's eyes were open.

Chen Yuhao also tentatively tried to insert his finger into the teacher's vagina, but the vibrator was already inside her
. He could only poke and rub the entrance of her wet vagina, unable to actually insert his
finger .

"Teacher, we've seen enough. Thank you for your insightful guidance and your great spirit of sacrifice."
Seeing that the teacher was already indulging in lustful pleasure, his comrades were more concerned with their own enjoyment, completely forgetting that
inserting their penises into the teacher's body was the ultimate strategic goal. Tang Chenwei, on the other hand, was a little annoyed and put on a rare show of gratitude.
Kids, they're only happy when others are happy, that's what you call the rebellious phase.

The teacher was a little surprised, after all, Tang Chenwei had never said thank you before, except when calling a female classmate surnamed Xie,
Xie Chenying.

"Teacher, please give me back the vibrator." Tang Chenwei put on a stern face, took out a tissue, and prepared to take the vibrator, which was now covered in
the teacher's secretions.

"Pfft!" Just as the vibrator left the teacher's vagina and she was leaning back to return it to Tang Chenwei
, an embarrassing fart sound echoed in the classroom! My instinct was to cover my nose, but the astonishing scene before me
left me stunned. I was certain it wasn't a fart, because the teacher's labia minora were
trembling from the force of the air emanating from her vagina!

Good heavens, the fart sound was coming from the teacher's vagina. Teacher Li Zhenzhen looked so innocent, yet
she farted from there! Not only was the teacher embarrassed, but I was also utterly ashamed.

"Teacher, have you ever given birth?" At this moment, Li Fa stood up expressionlessly and asked.
This temporarily made everyone overlook the astonishing sight of the teacher's vagina farting.

"Of course not, I'm unmarried," the teacher replied, straightening her posture.

"That sound you just heard is commonly known as vaginal flatulence or vaginal farts, usually caused by vaginal laxity after childbirth,"

Li Fa continued, his face slightly annoyed. "If you haven't given birth, it's because the muscles at the bottom of your pelvis
contracted , causing spasms in the uterus and reducing pressure. At the moment the vibrator was removed, a large amount of air was forced into the vagina."
" The vagina and uterus, and when changing positions, the vagina or uterus are under pressure,
which ."

I thought about it, and it was indeed because the teacher leaned back that she made a farting sound between her legs. Otherwise,
the teacher had been playing with the vibrator for half the class and I hadn't heard any sound.

"And the uterus will spasm, simply put, the teacher had an orgasm." Li Fa glared at the teacher angrily, and then
rudely sat down automatically.

Damn, no wonder the teacher repeatedly pulled the vibrator out of her vagina to stimulate her clitoris. I had heard that there
was no such thing as a "vaginal orgasm," and that to achieve an orgasm, one mostly relies on stimulating the clitoris; it turns out that Teacher Li Zhenzhen
took the opportunity to stimulate her clitoris with the vibrator, and the moment her thighs and collarbone turned red was when she had her first orgasm!

"Huh?" Hearing that the teacher had actually orgasmed in class by demonstrating vibrations, Tang Chenwei, Chen Yuhao and the
others shouted: "How can the teacher do this? She's enjoying herself and doesn't care about us!" "The teacher is unprofessional!" The children
's protests rose and fell.

The teacher was speechless. After all, what Li Fa had just said sounded reasonable. She had told me last week that she had
an aunt who had taught her a lot about male and female anatomy, and I didn't think she was just making it up. At that moment,
even I, who had just been asked to help stimulate her nipples, started to dislike Teacher Li Zhenzhen!

However, seeing that class was over, the teacher had no chance to salvage the situation and couldn't
bribe the students with her body. She could only shamefully put her underwear back on and watch the little brats walk past her with disdain.

[To be continued]

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[Junior High School Physics and Chemistry Course] (09) Author: rescueme

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