Gochu Masturbation Addict Little Sister
"Chaeyoung. Open the door."
My brother's voice was firmer than before. There's a weight to it when someone laid-back gets serious. Chaeyoung held her breath, pulling the blanket up higher. Her heart pounded like mad. Her whole body was still flushed from the orgasm she'd just had. Her stomach was a mess, and her hands were sticky. No way she could open the door like this. Absolutely not.
"...Busy. Later."
"You've been 'busy' this whole time."
"I am busy, that's why!"
Brother went quiet for a moment. Then he said,
"Chaeyoung. You just did it again, didn't you?"
"...".
"I told you to stop earlier, but it's gotten worse. I can feel it too."
She knew. She knew he could, but hearing it out loud hit different. He was feeling it. Right now, even as she touched it, gripped it, came from it. All of it, from just beyond that one wall.
Under the blanket, her gochu throbbed. Even after spilling just moments ago, it was hardening again.
No. Lee Chaeyoung, no.
But her mind wouldn't stop imagining. Brother standing right outside the door. Brother aware of her. Separated by just a locked door, feeling every stroke, every squeeze, right along with her. Right now. This very moment.
Her hand moved.
"Chaeyoung? Hey."
She told herself no. Her head knew better. But her hand wouldn't listen.
Brother knocked on the door. The vibration traveled through the wall.
It sped up. Her hand matched the rhythm of the knocks, picking up pace.
She's lost it. Completely lost it. Brother's right there at the door, and she's masturbating. He can hear it. He knows. He feels it.
"Ha, ah...."
A breath leaked out. She couldn't hold it back this time.
"...Chaeyoung. I'm getting the key."
She heard it. Clear as day. He's going for the key.
She had to stop. Right now. Wipe up, clean off, get dressed, act like nothing happened.
Lee Chaeyoung's brain whipped up a perfect action plan. In 0.3 seconds flat.
But her hand didn't stop.
Not much time left before he got back. The key was in the living room drawer. Round trip from his room: twenty seconds. Thirty at most.
Thirty seconds.
Chaeyoung's hand moved faster.
She heard slippers shuffling in the hallway. Drawer opening. Key jingling. Click. Found it.
Footsteps returning.
"Chaeyoung. Opening it."
Key sliding into the lock. Turning. Click. Unlocked.
That instant—the blocked path for the semen cleared too.
White light exploded in Lee Chaeyoung's head.
...My life's over.
That thought hit just as the climax crashed over her.
And the door opened.
"...".
Brother stood there. Hair messy, T-shirt rumpled. The usual laid-back face she liked... but not quite. It was subtly tense now.
Chaeyoung lay on the bed, blanket pulled up to her chest. Face beet red. Hair a tangled mess. Breathing ragged. Eyes damp.
And under the blanket—the fresh evidence trickling down her stomach.
Chaeyoung looked at brother. Brother looked at Chaeyoung.
The most suffocating silence in the world stretched out.
"...Ugh."
Tears spilled from Chaeyoung's eyes. Like a dam breaking, all at once. Everything she'd held back poured out. Remnants of pleasure? Shame? Terror? Probably all of it.
"S-sorry."
Her voice cracked.
"Sorry, brother. Sorry...."
Her knuckles whitened gripping the blanket.
Top of the school, calligraphy contest gold medal, flower on a cliffside. None of that mattered now. She was just the little sister caught jerking off with her brother's dick.
"I didn't mean to. It just appeared one day, and I didn't know what to do, so I touched it, and it felt good, and I couldn't stop...."
Words tumbled out incoherently. Not like the perfect Lee Chaeyoung. She'd even won an English speech contest. Always logical and composed. Now she couldn't string together a proper Korean sentence.
"I didn't even know it was yours. Not until you said it earlier. I swear. It wasn't on purpose...."
"...".
Brother said nothing. Leaning against the doorframe, looking down at her.
Chaeyoung tried to read his face. Anger? Disgust? Contempt? She braced for any of it.
No, she wasn't braced. But she had to be. This was the price for what she'd done.
Brother finally spoke.
"...Has it always smelled this strong?"
He strode in, yanked back the curtains, and opened the window. Airing the place out.
"If you're gonna do it, clean up properly. That stuff... semen sticks to your hands sneaky-like. Even soap doesn't get it all off."
"...".
"And don't let it get on the sheets or whatever. Wipe it off right away instead of letting it sit on your skin."
Chaeyoung nodded frantically, eyes wide like a rabbit's.
"And I get it, but I told you too much is bad, right? Back-to-back like that, and you might get blood instead of cum later. That what you want?"
She shook her head vigorously.
"Got it? Then ease up, and come eat. Mom's worried too. You haven't eaten since yesterday."
Brother was the same as always. No anger, no shock. He was always chill and oblivious, but even with his dick transferred to his little sister, that obliviousness held strong. Pretending not to notice her jerking his dick, semen smeared on her belly.
"Alright, I'm out. Wash up and eat."
As he turned to leave, like business was done—
"B-brother."
Chaeyoung stopped him. Her heart still racing.
"Can you... look at this for me?"
"At what?"
"Brother's gochu."
Chaeyoung mustered her courage. Asking him to look at his own dick was weird, sure, but it was important. Showing her brother his dick. Well, his dick, but it was still her shameful part. And showing the gochu meant her other parts would be visible too.
Her heart felt like it might burst.
"Hm...."
Brother pondered her words for a sec. Chaeyoung waited, holding her breath for his response.
"...Yeah. Makes sense. Gotta assess the situation."
He nodded like he'd convinced himself, then approached her bed.
*
Chaeyoung clutched the blanket, face flushed, eyes teary—but her voice was dead serious.
She wanted me to look. At my gochu.
Given the situation, it's not a weird request. Okay, it is weird. Objectively batshit weird. But my dick being on someone else's body was weird from the start, so the bar for weird got obliterated two days ago.
"...Yeah. Makes sense. Gotta assess the situation."
I sat on the edge of Chaeyoung's bed. She gripped the blanket tight. Knuckles white.
"...You gonna show me or what?"
"W-wait...."
She took three deep breaths, then slowly lowered the blanket.
Her lower half came into view. Baggy training pants already down.
There it was. My gochu. No doubt. Size, shape, even the slight leftward curve.
Damn, this is embarrassing. Never thought I'd objectively inspect my own dick on someone else's body.
But the setup was unique. Chaeyoung's pussy was right where it belonged. Soft hair and all. And my gochu sprouted above it like a tree on a lawn of pubes. Balls included. The sack hung low, partially covering her pussy lips. Coexisting.
Both fully functional.
"...Hm."
I tilted my head, peering closer without thinking. How the hell does this even work? I lifted the ballsack a bit. Underneath, Chaeyoung's origi—
"Brother!! Where are you looking?!"
Chaeyoung yelled, face crimson, thighs clamping shut as she covered herself with her hands.
"Gotta look closely first. Need to understand how it's attached."
"E-even so, not there...!"
"Not trying to peep at yours. Just checking mine. Gotta see how the balls are connected if we're gonna figure out how to detach it."
Theory checked out. Chaeyoung shut her mouth, conceding the point. But her thighs stayed squeezed.
"Pretend it's a doctor. Gotta grasp the situation properly. And you've been staring at and stroking mine plenty. So me looking is fair. We're siblings—no big deal."
No clue how that landed for her. But the wariness faded from her face.
"O-okay...."
Hands away, thighs parting again.
Staring at my erect dick attached to my little sister's slender body. Felt profoundly weird.
And below it... her pussy.
"Hm...."
I deliberately made a serious face as I lifted the balls again. Chaeyoung had her face buried in her hands, legs spread.
"So that's the structure."
Sure, my dick on her was bizarre, but who cares about the novelty? There's a pussy right below it.
Yeah. Dick's there, no doubt. But a proper pussy below. Pretty, clean one too.
Doesn't matter if it's my sister's. Point is, real pussy in front of me. A gorgeous one at that.
Weird sensation. The dick's definitely mine—shape, familiar smell. But something off-putting about the scent now.
The pussy below, though? Pretty shape, slutty vibe, and the smell was even more intoxicating. Womanly. In-heat bitch in estrus.
My body reacted hormonally. Even without a dick of my own.
"Huh?"
The erect gochu on Chaeyoung's body twitched. Linked to me, for sure. If I get excited, it does too. Same as how I feel her masturbation.
I get horny, she gets horny. Symbiotic setup.
"Brother... done looking?"
"Hm. Not yet."
Face covered, but her ears were red. Embarrassment obvious.
Especially the gochu's state. Out of control.
"Chaeyoung. Mind if I touch a little?"
"...Where?"
"The gochu, and, uh, the other parts too."
"No way!"
Figured. Too bad. She might okay the dick, but why ask permission for my own junk? Pointless without touching the pussy too.
"Got the structure down. No magic fix yet, but... I'll think of something."
I pulled the blanket over her crotch and stood.
Chaeyoung sighed in relief.
"You too—wash up and eat. You'll get sick like that."
As I headed out—
"B-brother. Wait."
"What now?"
Chaeyoung hesitated, then said,
"Can you... teach me how to do it?"
"Do what?"
A beat.
"Masturbate."
She said it.
Masturbate. Jerk off.
That jerk off?
"I wanna know. How do you... usually do it?"