You Want Me to Be a Teaching Aid in Sex Class?
Walking the academy grounds, I realized the final period was almost over. I left the places I still hadn't seen behind and headed for the classroom.
As I moved down the empty hallway, a familiar figure appeared up ahead. It was my homeroom teacher, Seol-noona. She spotted me, hesitated for a beat, then walked straight toward me.
"Sihyuk, do you have a moment? There's something I need to talk to you about regarding the caressing practice class that starts tomorrow."
After checking that no one else was around, she lowered her voice and continued.
"Normally the students practice on silicone models. There just aren't many men, and a lot of them feel uncomfortable exposing themselves in front of women."
A faint flush colored Seol-noona's cheeks as she got to the point.
"But if you're willing, Sihyuk… would you consider being the male practice model for the class? Nothing teaches better than feeling a living man's reactions firsthand. It would be an incredibly valuable opportunity for everyone."
Worried I might refuse, she hurried to list the benefits.
"Of course I'm not asking for free. The academy knows how demanding the model role is, so they offer several forms of support."
She ticked the points off on her slender white fingers.
"First, a very generous special scholarship. We can also adjust the practice content a little to match your preferences… and you get to choose your practice partners yourself."
Her eyes locked straight onto mine.
"Any girl you like. Chaerin, Subin… even me."
Hope sparkled in her gaze. Almost whispering, Seol-noona asked the final question.
"So what do you say, Sihyuk? Would you… be willing to take on the role of practice model?"
Something detonated inside my skull.
They want me to become teaching material for caressing and sex practice classes?
Every girl in my class might end up giving me handjobs, blowjobs, maybe even fucking me?
This was an offer I couldn't refuse even if it killed me.
I cleared my throat once and answered in the calmest voice I could manage.
"If it's for everyone's benefit, I don't have much choice. I'll be the practice model."
Seol-noona's face lit up brilliantly at my answer.
When class ended I left through the school gate with Chaerin and Subin. Plenty of other students were heading home at the same reasonable hour. Once again the girls' outfits caught my eye. Back on Earth those clothes would have earned them the label of total slut without any room for argument, yet here they strolled along without a care. If the weather warmed up even a little more, I half expected to start seeing naked girls on the streets.
Near the main gate, expensive-looking foreign cars sat lined up in a row. Relaxed men lounged inside while swarms of women competed to fawn over them. It was a world completely different from mine as I walked.
We talked about how our major classes had gone that day while heading home. Along the way Subin carefully asked Chaerin and me,
"Hey… want to come over for dinner tonight?"
The invitation surprised me for a second, but I quickly guessed her reason. HSDD. The condition I'd asked her to explain during Kegel class. That was why she was inviting us.
If I wanted to get closer to the truth behind the memo, I needed as much information as possible from the people around me. I planned to ask not only about HSDD but also about that suspicious cult.
Subin's house sat right next to ours, yet the atmosphere was night and day. After passing through a neatly tended little garden and opening the front door, warm lighting and a soft floral scent welcomed us. For a home shared by just Subin and her mother it was surprisingly spacious and cozy. Expensive-looking paintings hung on the walls, and a grand piano with sheet music sat in one corner of the living room.
"Your mom isn't home from work yet?"
"Yeah, she said she'd be a little late today. Make yourselves comfortable."
Subin guided us to the plush sofa, then went to the kitchen and returned with orange juice and fancy cookies. Being in her house for the first time made me a little awkward, but Chaerin seemed completely at home; she immediately pulled a board game out from under the living-room table.
We gathered around the table and started playing. It was a simple game of rolling dice and buying land. Chaerin was fiercely competitive—every time she threw the dice she either cheered or groaned at the top of her lungs. Subin simply watched her with a quiet smile, genuine happiness written all over her face. Only then did I realize how close the two of them actually were. They'd said they grew up in the same neighborhood; they must have been good friends for a long time.
The game went on for quite a while. When Chaerin finally lost she stood up.
"I'm gonna hit the bathroom real quick."
Once she disappeared down the hallway, only Subin and I remained in the living room. The lively atmosphere settled into a silence that wasn't uncomfortable at all. I decided this was my chance and carefully brought up the real topic.
"Can you tell me about that condition you promised to explain after school? HSDD?"
Subin's expression stiffened slightly. She fussed with the cup in her hands, hesitating. The ticking of the grandfather clock in the living room suddenly sounded deafeningly loud. At last she seemed to make up her mind and spoke in a small voice.
"That… Chaerin already knows about it too."
Her gaze stayed fixed on the floor.
"HSDD is short for Hypoactive Sexual Desire Disorder. Think of it as a hereditary disease that's been passed down through my family for generations."
She tried hard to keep her tone calm, but her voice still trembled faintly. That tremor carried loneliness and sorrow I hadn't known about.
"You already know women have crazy strong libidos. That's normal. But my family isn't like that. We don't need to masturbate every day the way other people do, and looking at a man doesn't automatically turn us on."
She paused and took a deep breath.
"So ever since I was little I've always been treated like a freak. The other girls called me a stone woman, a wooden doll… and guys never showed any interest in me at all."
Transparent sadness welled in her eyes.
"That's why I don't have any friends. Except for you and Chaerin."
Her confession made something in my chest ache. I finally understood the way the school nurse's attitude had turned ice-cold the moment she learned Subin had HSDD. The condition seemed to be treated as a defect, a disability, a social stigma. Now I understood why Subin's pussy had barely gotten wet during the physical exam unlike every other girl, and why she'd broken down crying that her own body was disgusting.
In a world where everyone saw through the single lens of sexual desire, she had been born with different eyes. HSDD was the two-eyed person persecuted in a land of one-eyed people. Minorities that the majority cannot understand are always the first to be cast out.
"Subin."
My voice came out far softer than I intended. At the sound of her name she lifted her head from the floor. And then I saw it—the deep fear that had settled into those emerald eyes. This went beyond simple surprise or embarrassment. She was terrified. Terrified that now that I knew about her HSDD I would despise her, loathe her, and ultimately push her away just like everyone else.
Looking into her eyes, I could suddenly picture the life she must have lived until now: pointed at by friends, misunderstood by teachers, ignored by adults. Yet even while trembling with the fear that I might abandon her and leave her alone again, Subin hadn't run or hidden. Instead she had gathered the courage to lay her painful, shameful wound bare in front of me.
Why? Guilt over not wanting to deceive a friend? Or the desperate hope that even someone like me might understand her? Which answer was correct didn't matter.
Something hot surged up from deep inside my chest—a tangled mix of emotion, apology, and a fierce protective instinct that wanted to shield her.
I didn't hesitate any longer. I wanted to end her fear. Rising from my seat, I sat down right beside her and carefully, gently stroked her hunched back, treating her as if she were a fragile glass ornament.
"W-why… Sihyuk? Did I do something wrong?"
"No. I just want to hear more. About HSDD."
The color drained from Subin's face at those words. Head hanging low, she whispered in a voice almost too quiet to hear.
"Why… would you…"
"If you're okay with it, I'd like you to tell me. About HSDD, and about the parts of you I still don't know."
I stayed silent and simply kept stroking her back, waiting until she felt ready to speak. A moment of quiet passed. Then, as if she had made a decision, Subin slowly opened her mouth, her voice thick with unshed tears.