Chapter 43
Iseol noona first displayed a complicated anatomical diagram on the screen.
She continued with a theoretical explanation of how the muscles inside the mouth—the lips, cheeks, tongue, palate, and so on—moved and created the pressure needed for fellatio.
“When performing fellatio, you must not use only your tongue. Fellatio requires you to utilize everything: the pursing strength of your lips, the soft pressure from the insides of your cheeks, the firm friction of your palate, and so on.”
After finishing the theoretical explanation, noona handed out practice tools to the girls.
The practice tool was a silicone dildo slightly smaller than my cock.
However, it was quite different from an ordinary dildo, because countless pressure sensors were densely embedded in its surface.
“Now, we’ll begin pressure-control training. Adjust your strength precisely to match the target pressure displayed on the screen.”
[Pressure Intensity : 1] appeared on the screen.
The female university students put the dildos into their mouths without the slightest hesitation.
Then about twenty pressure graphs appeared on the screen at the same time.
“The first target is a soft kiss, with a target pressure intensity of 1. Use only a little force and apply pressure as gently as you would when kissing a baby’s cheek.”
The graphs fluctuated wildly. At first, most of the girls failed to control their strength.
“Chaerin, you’re applying too much force. Don’t use your tongue.”
“Mmph, mm, y-yes.”
Chaerin put the dildo in her mouth again, her face tense with concentration.
Watching from beside her, I found her slightly parted lips quite cute as she concentrated.
Subin, on the other hand, did surprisingly well. Her graph trembled faintly but maintained a stable reading close to the target.
As time passed, everyone’s graphs stabilized and drew closer to the target.
Given her long tongue and skill at fellatio, Nari’s graph remained closest to the target for the longest time.
The next target was powerful suction.
“The target pressure intensity is 7. Make full use of your cheek muscles and suck hard, as though you’re creating a vacuum inside your mouth. This is the foundation of vacuum fellatio.”
All around the classroom, the girls’ cheeks hollowed inward with smacking and sucking sounds.
This time, Yeji from the track-and-field club stood out. Her graph surpassed the target in an instant and reached the highest point.
Her lung capacity and strength, trained through exercise, seemed to shine even in this setting.
However, Nari was the one who reached the target and maintained the steadiest graph.
Yeji’s pressure intensity was high, but she didn’t seem accustomed to fine control.
The final exercise was maintaining the vacuum state for as long as possible.
As time passed, the female students’ faces began to contort little by little. Some even shed tears, apparently from the strain on their jaw joints.
I leaned back comfortably in my chair and watched the entire scene with interest.
The sight of beautiful women desperately sucking on dildos in front of me was an excellent spectacle in itself.
The final three in the vacuum-maintenance exercise were Yuna, the blonde gyaru; Nari, with her long tongue; and Yeji from the track-and-field club.
After the first period ended, full-scale technique training began. Iseol noona brought up a flashy 3D video on the screen.
“The first technique is spiral fellatio. It involves rotating your tongue in a spiral as you move from the glans to the base of the penis, then from the base back up to the glans.”
In the video, a red tongue coiled smoothly up a transparent dildo like a snake.
It was such a lewd technique that the visuals alone made me want to receive fellatio.
“The key to this technique is moving your tongue while maintaining a consistent speed and pressure. You must use both the tip and the sides of your tongue.”
Without a dildo, noona stuck out her tongue into the air and demonstrated how it should move.
Seeing her tongue dart around in wide, circular motions was a little funny, to be honest.
The female students who saw it didn’t laugh at all. Each of them stuck out her tongue and devoted herself to practicing with a silicone training aid.
The way they licked their training aids with their tongues darting in and out made them look like a group of kittens.
Then, strangely enough, each person’s feedback appeared on the screen.
“Subin, relax your jaw a little and try to move as though you’re sticking out your tongue.”
“Mmph, slurp, y-yes.”
“Yeji, your tongue is a little stiff. You aren’t licking the base properly.”
“Yes!”
After receiving the feedback, Yeji worked her tongue even harder.
After practicing for quite a while, some of the girls began complaining that their tongues hurt.
Noona gave those students a stern warning.
“Everyone, this level is nothing. Daily Kegel exercises for your pussy and ass are the bare minimum, and you should also work on developing your tongue muscles.”
Next came the second technique.
“Glans stroking is a technique that uses the broad surface of the entire tongue to gently stroke upward from the base to the tip of the glans.”
Once again, we watched the video and then had to watch noona flick her tongue around in the air.
“Chaerin, move gently with the feeling of wiping it clean rather than licking it.”
“Haa, yes.”
After receiving the feedback, Chaerin glanced at me before diligently licking her training aid.
“The next technique, lip rubbing, involves rubbing the upper and lower lips against the shaft of the penis in turns, providing a soft friction different from that of the tongue.”
Explanations and practice of new techniques went on for two hours.
By then, beads of sweat had formed on the female students’ foreheads.
Their eyes were filled with nothing but the desire to learn how to please men more.
And at last, the time to fulfill that desire arrived.
“All right, now it’s time to practice directly on Sihyeok, our model.”
The moment noona finished speaking, the air in the classroom grew feverish.
Just like yesterday, I sat in the chair at the center of the platform and took off my pants.
My cock was already erect from the theoretical lesson that had gone on all morning and the heated gazes of the female students.
“As I did yesterday, I’ll demonstrate first today.”
Iseol noona stepped to the front of the platform.
She prostrated herself at my feet and assumed the dogeza posture without the slightest hesitation.
Even after seeing it again, both the girls and I nodded at the perfect posture of submission.
She carefully raised her head and kissed the tip of my cock, lightly touching it with her lips before pulling away.
Smack. The warm, soft sensation made my cock twitch and react reflexively.
Noona’s kisses began at the glans, traveled down along the shaft, and continued meticulously all the way to my heavy, dangling balls.
What an arousing kissing routine.
After covering every part in worshipful kisses, noona finally took my cock into her mouth.
Slurp.
A warm, wet sensation enveloped my entire cock.
As she had learned, noona began by demonstrating spiral fellatio.
Her tongue started at my glans and drew a smooth spiral downward toward the base, like a snake coiling around a tree and sliding down.
Then she licked back up from the base to the glans. A strange pleasure lingered wherever her tongue passed.
“This is spiral fellatio. It stimulates every surface of the penis and gradually warms a man up.”
She accompanied her fellatio with a running explanation.
Noona’s voice was gentle, but it carried the professionalism befitting an academy instructor.
Next came glans stroking. I felt a wave of satisfaction as her tongue carefully traveled upward from the base to the glans.
Noona properly demonstrated each shaft-service technique in turn.
Finally, she demonstrated a complete fellatio that combined the glans-service techniques we had learned yesterday with today’s shaft-service techniques.
“Ohhh….”
It was quite literally a form of art.
I felt as though my cock had become some kind of musical instrument inside noona’s mouth.
She would envelop it softly, then suck hard; tickle it with her tongue, then rub it with her lips. There wasn’t a single dull moment.
‘This is fucking insane…’
I leaned back in the chair, closed my eyes, and savored the ecstasy.
The stimulation was almost unfair. I nearly pulled my hips back without realizing it.
“If a man ejaculates, you must drink the semen and then stick out your tongue to show that you drank it all. That concludes my demonstration. Now it’s your turn.”
She licked the precum smeared at the corner of her mouth and smiled with satisfaction.
The classroom buzzed with the heat of excitement.
But I still had no intention of letting the other girls practice on me.
My gaze locked onto one person at the back of the classroom, watching the entire scene with her arms crossed.
“Baek Hayeon.”
The moment I called her name, every sound in the classroom stopped. Hayeon’s shoulders flinched.
“Aren’t you going to practice?”
She was clearly flustered, but answered while doing her best to pretend she was calm.
“I’m a man, so I don’t do that.”
“Really? Yesterday, alone behind the storage shed….”
“W-wait, wait! All right, I’ll do it!”
I hadn’t specifically intended to blackmail her, but Hayeon strode up to the platform, apparently embarrassed at the thought of having her masturbation exposed in front of everyone.
Of course, if she hadn’t been embarrassed, she would have masturbated in the infirmary’s masturbation room instead of in some corner like that.
She knelt in front of me. Her hands trembled, and her gaze remained fixed on the floor.
“…….”
Hayeon hesitated for a long while before finally taking hold of my cock with trembling hands and bringing it to her mouth.
“Wait.”
The person who stopped Hayeon was Iseol noona.