How to Help My Little Sister Masturbate
Chaeyoung is in my room. I try to remember the last time this happened. Middle school? No, maybe elementary school. As Chaeyoung grew up, she naturally stopped coming into her big brother's room. She started closing the door, locking it, carving out her own space. And I never really had a reason to call her in anyway.
Chaeyoung stands in front of my bedroom door, glancing around the room. Game posters, junk scattered on the desk, unmade bed. Nothing special. Just your average college guy's room.
"......It's filthy."
"It's always been like this."
"I know. It was like this before too."
Before. It's been a good while since Chaeyoung last came into my room. Back then, Mom still cleaned it for me, so it must've been tidy.
Chaeyoung slowly scans the room before stopping in front of my bed. She brushes the blanket lightly, like she's checking something.
"......Can I sit?"
"You're the one who suggested it. Go ahead."
Chaeyoung sits on the edge of the bed. Legs pressed together, hands neatly folded on her knees. More reserved than before. Not the soft vibe from the dining table earlier. She's tense.
A moment ago, the situation just carried us along. She'd lost all reason mid-masturbation, got caught, cried, and we flowed right into the next step. Emotional momentum.
But now it's different. We've washed up, eaten, calmed down—and now she's sitting in her big brother's room... about to strip.
"......"
Chaeyoung clenches her hands tight on her knees.
"Th-then...... Should I take off my pants?"
"Yeah."
Chaeyoung reaches for her waistband first. But she doesn't move. I look at her. She's in shorts—the short ones she changed into after her shower. That's when I notice it. The front of her shorts is bulging. Obnoxiously so. Women's shorts don't have much give up front, so the erect Gochu is shoving the fabric outward. You might miss it from the side, but straight on? Crystal clear. Was it hard the whole time we ate? Makes sense—we cut her off right before climax.
"Isn't it uncomfortable crammed in there like that?"
"......It is."
"Then hurry up and take 'em off. Getting squished cuts off circulation—not good."
Chaeyoung bites her lip, then slides her pants down. Slowly. They hit her thighs, revealing her panties. Plain white cotton. And inside, the Gochu strains against the fabric. A woman's panties holding an erect guy's dick. Bizarre combo. Erotic and fascinating. The panties are too small to contain it—the tip pokes right over the elastic waistband.
"...Weird."
"What!!"
"Nothing, just."
Of course it's weird. Objectively speaking.
Chaeyoung kicks off her pants completely and sits back on the bed. Panties still on.
"Panties too."
"......Do I have to?"
"How else? It's still squished."
Fair point. Chaeyoung seems to concede, falling silent. She squeezes her eyes shut and pulls them down. The Gochu springs free, twitching like it's finally liberated. Familiar shape—it's mine, after all—but sprouting from between Chaeyoung's thighs? Totally different vibe.
Okay, bottom half done. Now the top.
"Top too."
Chaeyoung's eyes go wide.
"......Why?"
Obvious question. This is where it gets crucial.
"Semen splatters when you cum. Stains clothes bad—hard to wash out. It was all over your stomach earlier in your room. Gets on your t-shirt, you gotta launder it. What're you gonna tell Mom?"
Chaeyoung's face changes. Mom. That word hits home.
"......Y-yeah, makes sense."
"And."
One more thing.
"Masturbation isn't just about the bottom."
"......What do you mean?"
"Gotta touch your breasts too for the full effect. Guys get heightened sensation from breast play."
Half-truth, half-bluff. Most guys don't fiddle with their nipples solo. But some do—and they swear it opens new worlds. So, half accurate.
Chaeyoung's only on day two of guy masturbation knowledge. No way to fact-check. She tilts her head.
"......Really? Breasts too?"
"Yeah. Pair it with nipple stim, pleasure's on another level. Works for guys and girls."
This part's legit.
Chaeyoung thinks it over. That overachiever brain churning, piecing together what she knows. Women feel breast stim too, after all.
"......Okay."
She's convinced. She grabs the hem of her t-shirt. Hesitates a beat, then yanks it off in one motion. No bra—makes sense, she came straight after her shower. Her top half's fully exposed.
"......"
So white. Slender all over. Delicate collarbones, and for her slim frame, breasts that are generously sized and perky. Pretty. Purely pretty. Feels weird thinking that about my sister's body, but objectively? Stunning. Pale skin, perfect tits, soft pink nipples. Crafted so flawlessly, it's more artwork than erotic.
Chaeyoung starts to cover her chest with her arms, then stops. She knows it defeats the point. Still, she turns her face away. Ears to neck flushed beet red.
My naked little sister on my bed. Erect Gochu on her lower half, her own body up top.
"Chaeyoung."
"...What."
"Not cold?"
"......Not really."
Speech turning cold again—embarrassment, probably. She was cute as hell crying and apologizing earlier, all little-sister-like. Still is. Still cute.
"Then let's start."
Chaeyoung nods. Reaches for the Gochu.
"Hold up. Not from the bottom."
"......Huh?"
"Told you. Breasts first. Warm-up."
"Warm-up?"
Confused look.
"Jump straight to the bottom, sensations get rough. Start slow from the top—builds better later."
Not a lie. Basic foreplay. Guys don't bother with breast warm-up solo, but she doesn't know that.
"......Really?"
"Yeah. That's how it works."
Chaeyoung eyes me suspiciously. But no knowledge to argue. Day-two newbie bows to the ten-year vet.
"So...... You touch them? My breasts too?"
"I'll start. When I move lower, you take the breasts. Can't do it all with two hands."
Logical. I rarely play teacher with Chaeyoung, but right now? I'm the expert.
She accepts it, going quiet.
"......Okay."
She lowers her arms, the ones half-covering her chest. Trembling. I sit beside her on the bed's edge. Inches away. Shoulders brushing. Her tense breaths hit me. I raise my hand. Fingertip grazes just below her slender collarbone.
"......Hic."
Her breath catches. Just a fingertip touch.
Skin already prickling with goosebumps. I slide down slow. Collarbone curve to the swell below. Smooth as silk. Finger traces the soft incline. Reaches the mound.
"Ah......"
Chaeyoung shuts her eyes. Bites her lip. Knew they looked big clothed, but bare? Bigger. Won't fit in my palm. Incredibly soft. Elasticity seeping between my fingers. I'm groping my sister's tits. Masturbation lesson excuse. The ones I couldn't even stare at clothed. Kneading them bare.
Then something weird happens. Me getting turned on by Chaeyoung's breasts? The Gochu attached to her reacts. Already hard, but it stiffens more, head rearing up visibly.
"Uh, uh......?"
Chaeyoung feels it too. The stim rising from the Gochu.
"B-bro, the Gochu......"
"Yeah. This is the warm-up."
"Warm-up...."
Her tits getting played with hardened it—or maybe my arousal. Latter feels bigger factor. I decide to be straight with her.
"My excitement's part of it. That's why my Gochu's reacting."
Chaeyoung stares blankly.
"You got... excited from touching my breasts......?"
Tough question. I'm the worst brother ever. No point lying, though.
"Yeah. I'm turned on."
Her ears flush deeper. But her eyes don't dodge. Locked on my face, drinking me in.
Fingers get busy. Slow circles over her breast. The cute, protruding nipple. Fingertip brushes the tip.
"Ah--!!"
Her body jolts. Hypersensitive reaction. Weak to nipple play, apparently.
"Chaeyoung's nipples are sensitive, huh."
"D-don't say it......"
Says don't say it, but her body doesn't pull away. Leans in a bit, even. Gravity and motion shift the shape. Mystery zone guys don't have. Even tiny changes have me quietly amazed. Beautiful curve from every angle.
I repeat. Slow. Touch, rub, light pinch. Her breaths grow ragged. Face heats up. Thighs clench, part, repeat. And the Gochu—with our rising excitement, it's at full mast. A clear droplet beads at the tip. Proof of my arousal. Proof of hers too.
"B-bro."
Her voice cracks.
"Touch... below too."
"Warm-up first, remember."
"Enough already—it's done, warm-up's over......!"
Desperate. Voice desperate. This Chaeyoung—the haughty, ice-queen one.
"......Yeah. Looks sufficient."
Right hand slides down. Grips the Gochu. Familiar feel. Used to be mine. But left hand skips past... lower still.
"Wait—bro, not there--!"
Her thighs clamp. Traps my left hand.
"Touch here too—feels even better."
"Y-you didn't mention that earlier......!"
"Earlier was teaching. This is doing. Different."
What logic? Doesn't matter—say it confidently. She has no comeback.
"Hate it? Just say so. I'll stop."
"......"
Chaeyoung opens her mouth, closes it. Tension in her thighs eases. Doesn't push my hand away.