Before putting her mouth on my cock, Chaerin looked up at me with confident eyes.
Then she alternated between holding warm and cold water in her mouth before taking my glans in.
The way she copied exactly what Iseol noona had just done was both cute and impish.
“The temperature’s okay.”
The moment I said it was fine, Chaerin’s tongue touched my glans.
A hot, wet sensation enveloped my glans.
She was clearly taking a more technical approach than any sexual service I had received so far.
Just as she had learned in the theory lecture, Chaerin spread her entire tongue wide and licked my glans, gently pressing against its surface.
The sensation of soft flesh enveloping my glans and sliding over it.
Perhaps because she was concentrating on the techniques, her tongue movements were slightly clumsier than noona’s. But even that clumsiness was stimulating.
“Smack, slurp, smuck….”
From the first technique to the last, Chaerin diligently performed everything she had learned.
Her broad tongue gently pressed against my glans, and her movements along the boundary line were fairly steady as well.
Overall, she was decent, if unremarkable, for a beginner.
But perhaps because I had just experienced Iseol noona’s near-supernatural technique, I noticed a few shortcomings.
“Sihyeok, if possible, could you give everyone at least brief feedback after they finish their practical training?”
At Iseol noona’s request, I gave Chaerin feedback once her practice was over.
“Chaerin.”
“How was it?”
After finishing all the techniques, Chaerin wiped her forehead, which was slightly damp with sweat.
Kneeling and slowly giving a blowjob must have tired her out.
I could immediately tell how hard she had worked.
Chaerin looked up at me with eyes full of anticipation.
‘Did I do well?’ was written all over her face. So I gave her feedback even more carefully.
“You were excellent overall, but I wish the temperature inside your mouth had been just a little warmer. Right now, it feels slightly lukewarm. And you put too much force into the final urethral stimulation. It felt more like poking than tickling.”
My criticism instantly turned Chaerin’s confident expression gloomy.
She pursed her lips, then drew them back in and muttered softly.
“…Got it.”
Though she was clearly frustrated, she obediently returned to her place and stood there. The look in her eyes showed that she was determined to give a perfect blowjob next time.
“Still, you did really well. I’m looking forward to seeing how you improve.”
Those final words made Chaerin’s expression brighten again.
Next was the vice class president, Cha Ayoung.
A cold beauty with straight black hair and catlike features. Even when she knelt before me, her cold expression did not soften.
Without showing any particular emotion, she performed the standard jaw stretches and adjusted the temperature inside her mouth.
Ayoung’s tongue touched my glans. The temperature was nearly perfect—warm but not hot, exactly the ideal temperature Iseol noona had taught her.
The soft texture created by the appropriate amount of saliva was exquisite.
But it was too soft. She licked so gently, as though she were handling precious porcelain, that the pleasure only lingered on the surface.
On top of that, there was no sound of her sucking my cock, and her expression never changed, so the mental satisfaction was lacking.
“Vice president.”
When I spoke to her in the middle of it, Ayoung stopped moving her tongue, blinked, and looked up at me.
“Put a little more force into it. There isn’t enough pressure.”
She immediately applied more pressure with her mouth. As her lips tightened and the pressure of her tongue pressing firmly against my glans increased, the intensity of the pleasure shot straight upward.
It was so satisfying that I leaned back in my chair and sighed like someone soaking in a hot bath.
After Ayoung finished all five techniques, I gave her feedback as well.
“You lacked force at first, but you’re excellent at incorporating feedback. You’ll improve once you get a little more accustomed to my cock.”
Even at my praise, she merely gave a small nod without changing her expression, then returned to her place and stood there.
For a moment, I imagined how nice it would be to see that expressionless face, like the one she wore during the physical examination, twist with pleasure.
Then it was Subin’s turn. She stood before me, extremely tense.
“Um… Sihyeok. It’s just, my mouth is small….”
“It’s okay. Take it easy.”
Seemingly encouraged by my words, Subin opened her small mouth and began stretching her jaw.
But not long after taking my glans into her mouth, her expression turned troubled.
Her jaw seemed especially weak compared to the other women’s. She had stopped before she could give me a long cleanup blowjob yesterday as well, so I supposed her jaw was the problem.
“Miss Han Subin.”
Unable to watch any longer, Iseol noona stepped in.
“You’re putting too much tension in your jaw. If you force yourself, you could injure the joint. Make sure you stretch your jaw every day.”
“Yes, ma’am….”
Subin looked up at me dejectedly, like a puppy soaked by the rain, and I couldn’t help smiling.
“Don’t overdo it. Just making the effort is impressive.”
My words made Subin’s face brighten. As I encouraged her, I heard envious reactions from around the classroom.
Though she was clumsy, Subin did her best and saw her service through to the end.
Even while continuously massaging her jaw, the gaze she directed at me was hotter than anyone else’s.
Next came Seo Yeji, the cheerful member of the track-and-field team. Yeji’s caressing was a little rough.
Rather than executing the techniques precisely, she seemed to be putting all her effort into moving her tongue.
But beneath that clumsiness, I could strongly feel the sincerity of her efforts for my sake.
The contrast between her usual energetic self and the way she looked up at me with shy eyes while concentrating intensely was quite amusing as well.
“It was a little rough, but I could really feel your sincerity. And that expression, so different from your usual one, is fun.”
“Thanks for the feedback! I’ll serve you even more diligently next time!”
Yeji laughed energetically at my feedback and returned to her place.
Then it was Lee Yuna’s turn. She was the gyaru-style girl with brilliantly dyed yellow hair who had stood out ever since the physical examination.
Just as last time, Yuna knelt before me with a confident smile and not the slightest trace of tension.
“Take good care of me, class prez~”
She gave me a wink with a pleasant nasal hum, then took my cock into her mouth in one go.
She seemed to have adjusted the temperature inside her mouth rather carelessly, so I had honestly underestimated her a little. I even thought she might be worse than Subin.
But she completely exceeded my expectations.
“…Oh?”
“Mmm, hoo, sluuurp.”
This was an entirely different sensation from everything before. It wasn’t that she was especially good at sucking; her tongue was simply different.
Yuna’s tongue was absurdly soft and pliable. It felt like jelly or pudding. Its temperature was pleasantly warm as well.
Every time her tongue glided over my glans, a wave of pleasure washed over me, as though the nerves throughout my body were melting.
Not satisfied with that, Yuna put her own spin on two of the techniques we had learned that day.
Unlike the other women, who adjusted their pressure during the Plain, she pressed against my glans as though she were mashing it with her tongue. But because her tongue was so soft, the pleasure was incredible.
And even though she tickled the urethral opening quite forcefully during the final Tickle, it didn’t hurt at all.
Thanks to that, my urge to ejaculate rose considerably. If she had continued just a little longer, I might have come.
The other techniques were ordinary, but Yuna was already my number one.
Perhaps she knew what I was thinking, because Yuna’s eyes overflowed with confidence as she looked up at me. She knew exactly what weapon she possessed.
When her blowjob ended, I praised Yuna for licking the very tip of my glans right up until the end.
“Your tongue is… incredibly soft. I’ve never felt anything like it. I think you’d be perfect if you just improved your technique a little.”
Since I was in such a good mood, I praised her without holding back.
Yuna gave me a victorious smile at my feedback, while Chaerin bit her lip with an expression of disbelief from one side of the classroom.
Then it was Lee Nari’s turn.
A conventionally pretty woman with long hair. But I clearly remembered the unusual detail I had noticed during the physical examination.
Her tongue was long enough to reach her chin. Nari had even succeeded in tying a cherry stem in just five seconds during the earlier training, astonishing everyone.
With the corners of her lips slightly raised, Nari quietly knelt before me and cautiously took my cock into her mouth.
“…Wow.”
This was another kind of pleasure. If Yuna’s tongue was the ultimate in texture, Nari’s was the ultimate in coverage.
The moment my glans entered her mouth, her long, soft tongue wrapped around every inch of it without leaving a gap.

It was an uncanny sensation: even after circling my glans once, her tongue still had length to spare. This was a true tongue blowjob.
It felt like a small, pliable snake squeezing my glans.
When she saw how pleased I was, Nari smiled charmingly with her eyes and continued the blowjob.
Nari performed all five techniques skillfully. But she didn’t stop there.
“Teacher, may I demonstrate one technique of my own?”
When Iseol noona nodded with interest, Nari took my cock deep into her mouth again.
And then… she began a technique I had never experienced before.
Nari wrapped her long tongue around my entire glans and slowly began adjusting the moisture inside her mouth.
At first, the surface of her tongue was wet and hot, but it gradually dried out and became rough and scratchy.
A dazzling wave of stimulation, shifting between wetness and dryness, softness and roughness, repeatedly crashed over my glans without pause.
“Ngh…!”
The urge to ejaculate that I had somehow endured until then reached its limit.
The moment I gripped the chair, Nari’s blowjob evolved another step.
“Schlup, schlup, slurrrp, slurrrp, slurrrp…!”
Her dry tongue moved at tremendous speed, vigorously rubbing my sensitive glans.
In particular, she rubbed the urethral opening at the tip of my glans over and over with her slightly rough tongue.
A jolt of pleasure raced down my spine as all my focus was drawn toward my glans.
The stimulation that had continued since morning, the worship of twenty women, and this absurd succession of glans blowjobs…
Everything piled up and piled up until, at last, I broke through my limit.
“I’m cumming…!”
I cried out briefly and finally ejaculated into Nari’s mouth.
Brrrshhh!
Hot semen poured into Nari’s mouth. Every woman in the classroom watched the scene in breathless silence.
Their eyes were filled with shock and unbearable envy.
Nari swallowed every last drop of my semen, then looked up at me with a satisfied smile.
“How was it?”
Leaning completely back in the chair, I didn’t even notice that Nari had addressed me formally, and simply nodded to show my approval.
It was her victory.