Instinct
I climbed back onto the bed and straddled Gyeo-ul's calves as she lay there facedown. Staring at her pussy, thoroughly defiled with my thick white cum, my cock—which had finally started to calm down—stiffened right back up.
I'm done holding back. You were the one who cut every single wire on this ticking time bomb, color by color.
"Ah, O-oppa... ah..."
No time to even give instructions. I just slammed my cock straight in. Maybe because my cum was acting as lube, it slid in nice and smooth.
...Fuck, seeing it like this, the visual conquest hits different. The curve of her spine from tailbone to neck, the line of her shoulders flowing into her armpits and those heavy tits, that impossibly slim waist—and above all, her prim little pussy now clinging vulgarly to my cock. It was turning me into a beast, bit by bit.
"Kim Gyeo-ul."
"Ngh, uh... o-oppa...? Wh-what...?"
"No matter what you say, I'm not letting go."
"Ah, ngh, hngh, wha...?"
"Even if you scream it hurts and hit me, I'm gonna keep pounding till I'm satisfied. So figure it out."
"Ah, hn, ang, haaah... ngh, uh... y-yeah."
Even as I thrust into her, she nodded her head. ...Crazy bitch. I'm not letting go. Even if you collapse from exhaustion and pass out, I'll keep pounding. I'll flood your insides over and over. Until I collapse.
I spotted the blindfold tossed by the headboard. Lately, just seeing it made my cock twitch and harden. I pulled her head out from the crook of my arm and slipped it over her eyes. With her face smashed sideways into the pillow, the view got even hotter.
...I never used to have a sadistic streak. But my lust was twisting in real time.
I gripped her hips and slammed into her with meaty slaps. The way her ass cheeks jiggled was a sight, but it wasn't enough. Too slow like this. I leaned forward, wrapped my arms tight around her stomach, and shook my hips like a dog in heat humping a cushion, pistoning my cock deep and wild.
"Ah, haaak, hak, ha... hngh, hek...!"
Her moans couldn't keep up with my pace. Instead of deep thrusts, I kept it short and brutal, scraping her walls raw with my foreskin and glans like sandpaper. The stimulation was insane. It hadn't even been that long since I came, but my balls were already twitching.
...Fuck it. I sped up my hips even more. Suddenly, her walls convulsed, clamping down on my cock in tight squeezes.
"Hek, he... haak... ha...!"
She didn't even have the breath to moan anymore, just ragged panting. But her pussy was kneading my cock like never before. At this point, "vulgar" fit us both perfectly.
I shook my hips like an animal until my waist started to ache, then blurted out a massive load deep inside her. Even as I came, I kept grinding. Pleasure was frying my brain. No, half of it was already gone. Left brain, right brain—one of 'em was definitely fucked.
"Ah... fuck. Ha... haa...!"
"Ngh, hngh, h... heung...!"
My legs were shaking too. Somehow, this came faster than the first or second time. I stopped thrusting and just stayed buried, but every twitch of her walls made my hips jerk. Still, my erection wouldn't go down.
As if trying to scrape out the cum soaked deep inside her, I started thrusting slow again.
"Hek, he... eh?"
"What."
"H-haa, oppa. D-did you... cum? Ang...?"
"Yeah."
"Th-then whyyy...?"
I wanted to shut up that mouth that kept pissing me off, so I pulled out for a sec. I gave her trembling ass a light smack, but no real reaction. I got off her and flipped her body over myself; only then did she lie flat on her back.
...Ah, fuck. Even right after cumming, she was too damn hot. Her sweat-slicked body all sticky, hair plastered to her blindfold-covered face, pussy foaming white—it was all driving my cock insane with rage.
"Spread 'em."
"Wh-what?"
"Spread your legs."
"..."
"Didn't you hear me?"
She finally covered her face with her hands and spread her legs into an M. I brought my face close to her pussy and stared. Unlike the swollen, flushed inner lips, thick white cum kept oozing out from deep inside. Using the semen as lube, I gently rubbed her clit over the hood, and nasal whimpers leaked out like she couldn't hold them back anymore.
I tormented her till she was overflowing, then grabbed my aching cock and stroked it. It didn't take long before the glans was scraping her walls again, sucked right back in. My perineum tugged a bit, sensations sharper, but no real pain yet.
So, I could keep going.
Slower than before, but deeper and harder. It went in all the way to the hilt—her navel was way deeper than it looked, but somehow she took every inch. Incredible.
"Hek, ah, haa, oppa, my th-throat, th...!"
"...Throat?"
"Thirsty... w-water...!"
For a second, I thought she was asking me to choke her—creepy as hell—but thankfully, no.
...I'm losing it too. Anyway, stopping wasn't an option. No excuse would make me stop till I was satisfied.
"Open your mouth."
I chugged from the half-empty water bottle by the bed, then held the last swig in my mouth. Mixed with saliva and lukewarm now, I fed it to her slowly.
"Mm, glk, haa... oppa...!"
"Gave you water."
"...Still thirsty."
"...What?"
"More...!"
The fresh bottle was on the desk, so I gave her more saliva instead. She sucked on my tongue like it was an oasis. The more our tongues tangled, the harder my cock got again. I slipped my hands under her back and crushed her against me. Pulled her upper body up like I was lifting it, then pounded her into the bed like it might break.
Her legs, with nowhere to go, wrapped around my thighs. Her mouth muffled her cries, leaving only the bed's creaks and thuds echoing in the room. If this weren't after my third load, her pussy would've overflowed three times over.
"He... mm, hng. Haa... oppa...!"
"...Yeah."
"...Do you love me?"
"...Yeah."
"Say it... hngh... out loud...!"
"I love you... so much."
"...Do whatever... you want...!"
"...!"
"Whatever oppa wants... with me...!"
Gyeo-ul, who looked too drained even to moan, squeezed out the words, begging for love. I'm going insane. Her saliva was too sweet, her sweat-scent too intoxicating, the mix of cum and juices too fucking lewd. In reward, I ground my pubic bone against hers as tight as possible. We clenched every muscle to stick even closer. Into the deepest spot—where it'd be a hundred percent risky without protection—I poured out every drop left, unbelievable after just cumming. Our bodies shuddered so violently it was scary; I hugged her till I couldn't breathe.
"...Hoo... Kim Gyeo-ul...!"
"Haa... ha... hoo... I love you... so much, oppa...!"
"...One more time."
"...Wh-what?"
"Slow this time. Promise."
My cock was starting to hurt, but I didn't pull out—just rolled us onto our sides. No way I could move much now. Balls aching like hell, glans trembling. I slipped off the blindfold and peered into her exhausted eyes. Lips to mucosa, I paused the thrusts and licked her neck. Licking alone felt lacking, so I nipped and sucked her skin. Leaving marks, just like she wanted.
"I... I really... can't move anymore...!"
"You weren't moving anyway. I did all the work."
"For real... I'm dying here...!"
"'Cause you don't work out. I could go more."
"...Mercy... please...!"
"Nope."
To coax my softening cock, I carefully rocked my hips. It twitched in protest like what the fuck, but hugging her tight and grinding nipple to nipple settled it right back to rigid.
...Where do you think you're going, you fucker? Trying to outlast your owner?
"Y-you... oppa... aren't tired...?"
"I am."
"Then whyyy... hek... haa...!"
"'Cause you're too fucking hot."
"Wh-what...?"
"You made it so I can't see you as a sister anymore."
"...Haa, ah. Ah...!"
"One more, then sleep."
"...Y-yeah."
I gripped her unmoving ass and eased into her from behind, slow. Savoring every fold of her mucosa. Her walls, writhing wildly before, now limp and obediently scraping my cock. Intensity, girth, length—all down from earlier—but it didn't ruin the sex. Balls aching was the only price, and it still felt good.
"...Gyeo-ul."
"...Yeah."
"Till Monday, remember."
"...Yeah."
"Don't even think about going out."
"Hngh...!"
"Mom comes back, we're siblings again."
"...!"
"...Gonna make up for all the time we can't."
Honestly, a promise I can't keep. This sweet grip, this high sharper than drugs—I can't forget it. I'll try to hold back, but I'll break eventually. A year from now, ten years, or not even a month.
No way I can endure it.
"...Oppa."
"Yeah."
"You... mad...?"
"...Do I look like it?"
"'Cause I didn't tell you... about the pill?"
"You keep pissing off my cock."
"Y-your cock...?"
She'd gotten used to it by now; with my slow, snail-like thrusts, we could even talk normally. Her body still trembled, but my tight hug seemed to calm it.
"...Earlier."
"What."
"When you came inside...!"
"You kept nagging me to ditch the condom."
"What if... I wasn't on the pill?"
"...Didn't think that far."
"Wh-what...?"
"If I could think straight, I wouldn't have jumped you."
"...!"
"...You knew something, didn't you?"
"Kinda... yeah...!"
"Who told you?"
"Just... the internet...!"
Ah, fuck. That's why they call it an ocean of info—total bullshit. Or is it? Oceans are full of trash too. Whoever fed Gyeo-ul this warped sex knowledge. Condoms are supposed to be non-negotiable, you bastards. Now I can't even use 'em.
"Guys... supposedly get tired after one or two times...!"
"...So."
"...And they like it raw...!"
"...!"
"Saw they get super happy if you let 'em cum inside...!"
"...!"
"Was scared at first 'cause it hurts a ton... but it wasn't that bad... ngh, hot, o-oppa?!"
Haa... fuck, my cock hurts so bad. Why keep teasing it?
"...Hurry up and sleep."
"Ha, ah, a, haaah. Ngh...!"
I gripped her hips, squeezed out wet squelches, and—barely—came one more time. Way less than the first, but still. Whew... Honestly, if my balls didn't ache, I could've gone more, but pain's setting in. All me moving's got my body sore too. Glans stinging.
"Ha... hoo...!"
"...Hngh, ha... uh...!"
"...Night, Gyeo-ul."
"...Yeah. ...Love you."
"Stop pissing me off, huh?"
"Wh-what?"
"Just sleep."
"...Yeah."
I pulled out my overworked cock. No cleanup, no nothing crossed my mind. Just like this, drenched in each other's scents, bodies as blankets, we slipped into quiet sleep together.