Chapter 2
Oppa's gochu feels too good.
Chaeyoung was a perfect human being. Top of her class in middle school. Top of her class in high school too. Gold prize in calligraphy contests, grand prize in English speech competitions, vice president of the student council. Naturally, she got into university through early admission. And with her absolutely stunning looks inherited from her mom, she had nothing to envy. She was the object of admiration for guys and envy for girls. The reason girls' envy never turned to jealousy was probably because Chaeyoung completely ignored all men. No need to get jealous of a non-competitor. Better to befriend her and stand by her side.
Such a seemingly flawless girl, Chaeyoung's recent hobby was none other than masturbation. And not just any masturbation—it was the kind where she thought of her brother until she fell asleep. It was a stress-relief method she'd developed herself. Pretending to be the perfect human was more stressful than it seemed.
But this house wasn't well soundproofed. There was a risk her voice might leak to the room next door, to her brother. If that happened, her life of feigned perfection would be over. That precariousness became a spice for Chaeyoung. And masturbating while thinking of her brother of all people was part of it. Incest. The ruin that comes from coveting forbidden fruit was all the sweeter. What if her brother found out she masturbated thinking of him? Just imagining it sent chills down her spine. And that chill translated to pleasure for Chaeyoung.
The fantasies during her sessions were like that too. Her true self exposed to her brother, then forcibly taken by him. Night after night, she masturbated thinking of her brother. That day was no different. She masturbated ordinarily and fell asleep ordinarily. But the next morning was anything but ordinary. She'd wet the bed. That was fine. These things happen. A gochu had appeared. That was not fine. That was impossible.
"Kyaaah—!!"
Chaeyoung let out a scream utterly unlike her. The gochu. It was weird, gross, and somehow a little cute. And now it was attached to her crotch. She searched all kinds of things online. Naturally, it was all nonsense. From the moment she woke up until sunset, she agonized over it. But no answers came. She had no choice but to investigate herself. She lifted the blanket she'd been hiding under. And examined the gochu closely.
Touching it this way and that, it grew a little. Curious, she touched it more, and it got even bigger. And the pleasure from touching it. It was similar to her nightly masturbation, but a bit different. She tried pressing the tip like usual, but it felt frustrating. She decided to grip it with her hand and rub with more surface area. Chaeyoung thought she was a genius. Shaking it like this felt way better than just pressing and rubbing the tip. So this was what a guy's sensation was like. Squeeze and feel, move and feel more. Direct, simple, intense. Completely different from her own body's sensations. A girl's built up slowly, but this... it came right away when touched.
From then on, Chaeyoung entered a trance of gochu masturbation. The pleasure of ejaculation blew away all her worries and frustrations. Not satisfied with once, she did it twice, three times. Until she passed out asleep. Masturbating thinking of her brother until sleep wasn't different from usual, but it was a burden on the gochu. Tomorrow, just a little, she thought as she drifted off.
The next day. Dawn, five a.m. The front door opened and closed. Mom heading to work. Chaeyoung stirred slightly at the sound, then closed her eyes again. She'd overdone it yesterday. She'd gone nonstop with her new gochu masturbation discovery. She definitely felt like she'd strained the gochu, but she couldn't stop. Just in case, she slipped her hand into her panties under the blanket. Worry and relief hit at once. The gochu was still there. And it was rock-hard under the blanket. Pressed flat against her stomach. No soreness from last night's marathon either. Refreshed in just one day.
"...Just once."
Her vow from last night to go easy was already forgotten. Her pale, delicate hand slid down again. Chaeyoung's willpower was strong enough to make her top of the class, but it was powerless against morning wood. And so one time ended. Refreshing. Now really stop. She rolled over. Closed her eyes. Done. Over. Thirty seconds. Nope. Not over. Still hard. She'd read guys sometimes don't respond, but why wasn't it applying here? Was morning different? Second time. ...Yeah, she was getting the hang of it. Ended faster than yesterday. Efficiency up was good, but shorter cooldowns between rounds were the problem. Third time. At this point, even Chaeyoung had to admit it. This wasn't research. This was addiction.
Chaeyoung clutched the blanket, panting heavily. Sweat beaded. Her thighs trembled. Her stomach was a mess again. She reached for tissues to clean up, but another urge surged. No. Stop. You have to stop. Chaeyoung, stop. But her hand went down again. Just once more. The moment she thought that, a knock sounded. Knock. Knock. Knock.
"Chaeyoung."
Her brother's voice. Her hand froze. Her heart plummeted. She yanked the blanket up.
"...What."
"Can't you stop that already?"
"......"
Chaeyoung's thoughts halted. That? He said that? What the hell was he telling her to stop? No way. Had he heard? Did sound leak? No. Door was locked, and she hadn't made a noise. She'd gritted her teeth and held it in. So how?
"Wh-what are you telling me to stop?"
She forced her usual voice. No trembling. Don't let on.
"...Just. What are you doing from morning?"
"What I do in my room is none of your business, is it?"
She snapped sharply. Defensive instinct. When cornered, Chaeyoung switched to attack—it had been her habit since childhood.
"That's not..."
"Not what? I'm busy right now? Don't knock."
"But you're..."
Her brother went quiet. She heard him scratching his head through the door. That laid-back habit of his.
"You know you took my gochu, right?"
Shiver. Every hair on her body stood up. Chaeyoung's voice trembled as she shot back.
"Wh-what the hell are you talking about?"
"I don't know how or why you took it, but... if you borrow someone's stuff, use it nicely. What if you overuse it and break it?"
"What the hell are you saying?!"
She yelled louder from rising panic. Her brother backed off like he'd poked something he shouldn't.
"Okay, okay. I won't mess with you. But don't do it too much. It's hard on me too."
Footsteps receded. He'd really left. Chaeyoung clutched her chest under the blanket. Her heart pounded like mad. He knew. That she had his gochu. That she was masturbating with it. And she knew too. That it was her brother's.
"It's hard on me too."
His words echoed in her head. Hard. Meaning every time she touched it, he felt it too. Last night. Today. Together with her.
"......"
Her face burned. Shame. It had to be shame. She heard her perfect mask shattering. But. Under the blanket, the gochu... stood even harder than before. Weird. She felt shame, but her body reacted the opposite. No, not weird. Chaeyoung knew herself well. Who was it that climaxed every night imagining her brother catching her? Who got off on the thrill of maybe getting caught? That "what if" had become reality. He knew. That she'd jerked his gochu. He felt it. All of it. This wasn't fantasy. It was real.
"...Ha."
Hot breath leaked out. Her hand shook. Fear? Excitement? No distinction needed. For Chaeyoung, they were the same. Her hand went down. No excuses this time. No scientific research, no just once. This is my brother's. His gochu. For the first time, she gripped it acknowledging that. Until yesterday, it was some mysterious thing. But now it was different. This was her brother's. The brother she lived with, brushed past in the hall, sat across at meals. Part of him was in her hand right now.
"Ngh...."
The sensation was different. Same gochu, same hand as yesterday, but the pleasure's quality had totally changed. Just that recognition flipped everything. And right now, beyond the wall, her brother was feeling it too. Every squeeze. Every stroke. Together.
"Ah...."
That thought alone heated her lower belly. Chaeyoung's reason had already shut down. The top-student brain, judgment, cool aloof flower on a cliff—all gone. Only sensations from her fingers and gochu remained. He'd said not to do too much. That it was hard on him. So right now, he was probably suffering in his room. Trembling with every move she made. Tormented by sensations he told her to stop but wouldn't end.
"Ha, ah...... aaah."
It sped up. Her hand moved on its own. Her head emptied. Caught. Perfectly caught. Her ugliest, most secret side exposed to him. To her brother. Life over. Over. But. It felt good. Insanely good. Climax hit. Fourth time today? Fifth? She'd stopped counting.
"...O, oppa......!!"
She clenched her teeth. A scream nearly burst from her throat. Her body arched like a bow, then slumped limp. It spilled hot and sticky over her stomach. He felt this too? The ejaculation sensation. Everything. She panted raggedly, staring at the ceiling. Exhausted, breathless. After a short rest.
Knock knock knock.
...Another knock.
"Chaeyoung. Open this door."
Shiver! Every hair stood again. And the gochu hardened once more.