Seoyeon's voice trembled faintly, but unmistakable anticipation lingered in it.
I couldn't refuse her offer. No, I hadn't even intended to refuse in the first place.
Walking around the academy with an erection hard enough to burst was an ordeal.
Above all, the woman in front of me was incredibly arousing.
But the shred of wariness caused by yesterday's note made me hesitate.
So instead of answering, I stood before her in silence.
Perhaps taking my silence as consent, Seoyeon found the courage to try again.
She gently grasped my wrist and slowly pulled me toward the bed. It was a gentle yet irresistible force.
Because she'd just put her panties back on, the outline of her pussy was clearly visible through the thin fabric.
Seoyeon sat me down on the bed, then knelt on the floor and assumed a position for fellatio.
The moment I saw her submissive posture, a good idea occurred to me.
“Wait a moment.”
I grabbed Seoyeon's shoulder as she was about to kneel. Then I spoke in a low voice.
“Show me what you were doing earlier.”
“Pardon…?”
“Masturbating. I want to watch.”
Seoyeon opened her eyes wide in surprise.
But that lasted only a moment. Along with her shame, a strange arousal appeared on her face.
Showing her most intimate act in front of a man was a rare pleasure for a woman in this world.
“Yes, I understand.”
She obediently nodded and climbed back onto the bed.

Then she stretched her legs toward me and leaned her back against the headboard.
When she tossed off her panties without hesitation, her pussy, glistening with vaginal lubrication, came fully into view.
Seoyeon began gently pressing her clitoris with fingers slick with her own vaginal lubrication.
“Ah, ngh…!”
Knowing that my gaze was fixed on her pussy, she quickly began to grow aroused.
I watched her with interest and slowly asked questions in an informal tone.
“How often do you masturbate?”
“E-every day… ngh, two or three times a day….”
“Where are your erogenous zones? The place you're touching now?”
“Yes… here, ngh, my breasts… and…! Hoo, ugh…!”
Even as she gasped out her answers, she never stopped moving her fingers.
I asked my final question.
“What were you imagining while masturbating?”
As soon as I finished asking, the movement of Seoyeon's fingers faltered.
She seemed to hesitate for a moment, but her brain was already steeped in pleasure, so she gave me an unfiltered answer.
“…Imagining having sex with you, Sihyeok.”
The moment she finished speaking, I stood up and approached her.
“Really?”
“Yes, really—imagining your cock inside me, ah, ngh…!”
I flung Seoyeon's gown open and pinched her erect left nipple between my fingers.
At the same time, I grabbed her pussy with my right hand and plunged my fingers into her wet vagina.
-Squish, squish!
“That's your reward for answering honestly.”
“Hwaaaang!”
Her vagina had already been thoroughly relaxed by masturbation, so my fingers slipped in easily.
After only a few thrusts, she quickly shuddered and came.
“Haa, haa, I-I'm c-coming…!”
The sight of a woman helplessly collapsing from a single one of my fingers.
No matter how many times I saw it, I never grew tired of it. It aroused me so intensely that my head grew hot.
While Seoyeon was still caught in the afterglow of her climax, I caressed her pussy even more roughly.
When I gently scratched her areola with my fingernail, her body flinched again.
“Ngh, w-wait…!”
When she instinctively twisted her body to escape, I commanded her firmly.
“Don't move.”
Her movements stopped abruptly at my command. Her face, flushed and distressed from the excessive orgasms, looked cute.
I found Seoyeon's G-spot, the erogenous zone of her pussy, and began tormenting it persistently with my finger.
“Haa, haa…! I'm going to come again…!”
Seoyeon gasped and wanted me to stop, but it was already too late.
Her pussy convulsed violently and sprayed a fountain toward the ceiling.
Hot vaginal lubrication soaked my hand and the bedsheets.
I pulled Seoyeon's trembling legs toward me and draped them over both my shoulders.
Seoyeon naturally ended up lying down, and I removed my pants and underwear without hesitation.
When my huge cock emerged, Seoyeon gazed at it with eyes filled with emotion.
I brought my glans to the entrance of her pussy and rubbed it lightly.
When I paused for a moment, she seemed to think I was worried about contraception and spoke urgently.
“It's okay! I'll definitely take contraceptive pills! Please… please cum inside me…!”
I wasn't the kind of man who would back down in the face of the sweet temptation of ejaculating inside her.
Unlike my first time with Iseol noona, I didn't go easy on Seoyeon from the start.
I grabbed Seoyeon's waist and drove my cock all the way to the root in a single thrust.
-Schlup!
“Ugh…! Haa, ah, this is a real cock…!”
The bed creaked noisily.
My glans ruthlessly tore through her hymen and slammed hard against her cervix.
Seoyeon cried out, her scream mixing pain and pleasure.
But the pain soon melted away, and an overwhelming wave of pleasure swept over her.
“Ah, aaah! I love it…! So good…!”
Seoyeon writhed and climaxed intensely from merely having my cock inserted.
Her virgin pussy, which had waited for a man all her life, couldn't remain still for even a moment.
Every vaginal wall inside her writhed and clenched around my cock as if welcoming it.
Her pussy was so tight that I had to exert force just to pull my cock out.
I whispered into Seoyeon's ear in a low voice.
“Teacher, relax a little. Otherwise I can't move.”
“But… ngh, it's so big… I can't help tensing….”
Seoyeon answered between gasps. I grinned and slowly began moving my hips, little by little.
My cock went in one centimeter, then withdrew one centimeter.
Even that minute movement made Seoyeon's body react sensitively.
“Haa…! Ah…!”
I gradually increased the pace—shallow thrusts, but faster and faster.
Once Seoyeon had grown accustomed to my speed, I abruptly stopped moving my hips and left her unable to think straight.
Before long, Seoyeon's pussy had grown accustomed to the shape of my cock and began wrapping around it. So I moved my hips again.
The light sounds of friction—slap, slap—gradually grew faster.
A thrilling pleasure rose from my glans and traveled up my spine. Surrendering myself to instinct, I pounded my hips like a beast.
The dull, wet sounds of flesh colliding were lewd and pleasant to hear.
-Squelch! Squelch! Squelch!
“Wait, wait…! You're going too fast…!”
Seoyeon begged me, but I instead sealed her lips with a rough kiss.
When my tongue explored her mouth, she couldn't even think of resisting and accepted my kiss.
Her vaginal walls, contracting with her climax, squeezed my cock tightly.
I savored that maddening sensation to the fullest and continued moving my hips.
Though no one had taught me, I could feel my movements becoming more and more skilled. Perhaps I was a genius at sex.
Seoyeon's pussy had already been tamed by the movements of my cock, spurting vaginal lubrication and twitching in rhythm with it.
Seoyeon reached another climax with a scream.
I didn't let the moment pass and thrust my cock even deeper.
Her convulsing vaginal folds squeezed my cock tightly. Overwhelmed by the intense pleasure, I paused to catch my breath.
I began moving again toward Seoyeon, who was trembling faintly in the afterglow of her climax.
This time, my cock knocked deeply and heavily against her cervix—thud, thud.
Each time I struck her cervix, Seoyeon's body bounced on the bed.
“Ah! Ah! There…! There…!”
I found the spot where Seoyeon felt the most pleasure.
Focusing on that spot, I tormented her in various ways, rotating my hips in circles or pressing down hard.
Seoyeon was helplessly toyed with by my movements, swept away by waves of pleasure.
Feeling as though something was missing, I showered her with kisses while violently rubbing her clitoris with the thumb of my free left hand.
“Hngiiiiik…!”
Seoyeon's eyes rolled back.
Overwhelmed simultaneously by a tremendous wave of orgasm from her mouth, clitoris, and the inside of her pussy, she stretched out her legs, trembled violently, and climaxed again.
White, foamy vaginal lubrication and transparent climax fluid shot upward in a fountain.
It must have been the ultimate pleasure, incomparable to the secret masturbation she did alone.
But the lust switch inside me still hadn't turned off.
Seeing Seoyeon panting after exhausting all her strength only made my desire boil hotter.
I moved my hips again without resting.
This time, I kept only Seoyeon's right leg over my shoulder and began thrusting at an oblique angle.
When I pierced a different spot than before, Seoyeon couldn't hold back and let out a moan.
I explored every part of Seoyeon's body, kissed and bit her, and learned more about a woman's body.
When I grabbed her breasts, she seemed to feel a little pain, but her pleasure-soaked body accepted even that pain as sweet stimulation.
After shaking my hips for a long time, I poured hot semen inside Seoyeon.
Seoyeon was completely exhausted, with not even enough strength left to give me a cleaning blowjob.
I pushed my cock, glistening with my semen and her vaginal lubrication, into her mouth.
“Wup, mmph, slurp, sluurp, chuup.”
Seoyeon barely managed to open her mouth and take my cock.
Her blowjob lacked much strength, but I was satisfied by her commendable effort to clean my glans as thoroughly as possible with her tongue.
After sex, I got dressed, but Seoyeon was still lying naked on the bed.
Seeing her made me horny again, so I fingered her pussy a little more.
Perhaps there wasn't much fluid left, because Seoyeon only squirted a little before trembling.
I left the soundproof booth. Seoyeon somehow managed to rise, staggered into her clothes, and followed me out.
In front of the health office, she greeted me with a dazed expression.
“Goodbye….”
I smiled and told her to take care, then suddenly grabbed a handful of her large breast.
“Your pussy grips pretty well. Build up your stamina, and let's have sex again next time.”
“Yes…!”
At my praise, Seoyeon blushed and rejoiced like a girl in love.
I left the health office feeling satisfied.
***
And there was a pair of eyes watching all of it from behind the wall around the corner.