Because You're My Brother
I lay silently on top of my sister for a good long while. It was amazing. Born from the same parents, yet just one difference in gender made such a world of difference. Her body was warm and steaming hot, soft and fluffy, smooth and squishy—the texture never got old no matter how much I touched it. I wanted to stay like this with her forever.
"...Oppa, you gonna stay like this the whole time?"
"Yeah."
"You've done enough already. You're heavy..."
"Don't wanna pull out."
"...You wanna go again?"
"Nah, not that. But if I do, the cum'll leak out."
"C-cum..."
"Gotta plug it up tight like this so it doesn't spill."
"Ah, the bed... it's gonna get dirty."
"Not what I meant."
In truth, I'd already pumped so much inside her that it was overflowing, and the blanket spread out on the sheets was beyond ruined—I'd have to toss it. But still, I didn't want to pull out. It was the same reason she demanded kisses from me.
"You said you'd give me one kid. ...So I'm never pulling out."
Staying connected felt sweet. I wanted to feel her even more, just a little longer. Her clumsy expression was irresistible, and I wanted to leave proof that she was mine. Even if it was something we shouldn't do—it didn't matter anymore. As long as she didn't refuse.
"...You mean that, Oppa?"
"How many times do I have to say it for you to believe me?"
"Siblings... aren't supposed to make babies. That's the rule."
"Then siblings fucking is okay?"
"...That's not okay either."
We'd already crossed so many lines, right and wrong be damned. They say the first bad deed is the hardest. Crossing that initial boundary had been excruciating, but skipping over all the ones that followed? Easier than I'd thought.
"How... are you gonna take responsibility?"
"...We'll figure it out."
"Isn't that a bit too thoughtless?"
"If I had any thoughts, would I be doing this? Pouncing on my little sister. Cumming inside without protection."
"Well, yeah, but..."
"...I'll make it work somehow."
Could I really? I was just a blood clot still years from graduating college—what could I even do? Escape Mom's shadow, protect her without a single ally, shield my sister from every curse hurled our way? I had faith in myself, but even I knew it looked damn near impossible. Still, we'd come this far. No turning back now.
"Oppa, seriously, just pull out for a sec...?"
"Why."
"...I'm thirsty."
"Want some of my spit?"
"That's gross as hell. ...You're thirsty too, aren't you?"
"Not me."
I was parched too, but I didn't want to separate even for a moment. Teasing her while dodging her requests was fun. And I was dying to know how long she'd stay mad.
"Fine, I'll... make sure no cum leaks. Go get some water."
"...That thirsty?"
"You're way heavier and bigger than me, crushing me like this—think it doesn't tire me out?"
"You barely moved. I did all the work."
"That's... 'cause you're too damn fit."
"You know that, so why poke at me? You knew it'd end like this."
"...Last time like that, I'd actually pass out."
"Last time?"
"Like at the hotel. When we did it together like that... it felt amazing. But I couldn't keep up with all your lust..."
That one sentence—wanting to satisfy my desires—melted away my lingering pettiness. She didn't have to be this obsessed. She wasn't denying me doing whatever I wanted. She felt completely mine. The well of my possessiveness, bottomless before, was now brimming over.
"So you tried to get me to pounce on you?"
"I didn't try! You just jumped me on your own..."
"Got it. ...I'll get the water."
I slowly withdrew my cock, which hadn't slipped out once during two orgasms. Maybe because I'd wiped off all the cum clinging to her walls on the way in, the head came out surprisingly clean. The moment I finally separated, my sister—free to move after so long—shuddered her legs and let out a deep breath.
"Stay put while I get water. Don't dirty the bed more."
I headed for the door, but somehow she'd taken that the wrong way. Instead of just pulling her panties back on, she stayed lying down, knees to her chest, folding herself in half. Hands under her thighs, she spread her slightly gaping pussy with both hands, blocking my cum from leaking out.
"...What the hell are you doing?"
"You said... not to let the c-cum... spill..."
"Hah... fuck, Kim Gyeo-ul."
"Why cuss...? ...I did what you said."
"Where'd you learn this shit?"
"You told me... to do it like this..."
Unlike when she blatantly seduced me, that dumb, innocent look in her eyes as she stared—pretending not to know while knowing full well—turned me on harder than ever. My cock, still trembling from the deep creampie, stiffened right back up. I plunged it back into her hand-blocked pussy, then slid my hands under her back and lifted her up.
"Wh-what? O-oppa?"
"...Hold on tight."
"The water... it'll spill..."
"You can drink outside."
"C-cum... it's leaking..."
"I'll refill it."
"...You fucking trash..."
I knew it was trashy, but you'd said it yourself. You liked me trashy. Connected to her again, I stepped off the bed and out of the room. She clung tight for balance, just like at the hotel. Each step made her whimper—ngh, ngh—and I loved it. Even with this bullshit, she never hated me.
"Here, water."
"Can't use my arms. Put me down..."
"Then don't drink."
"I'm really thirsty..."
I carefully walked to the water purifier, filled a cup, and handed it over—but of course, she couldn't drink while hugging me. For my sister, who couldn't do anything but cling, I took a sip and passed it mouth-to-mouth, like last time. A few times, enough to quench her thirst. She sucked obediently on my tongue like a baby bird from its mother—stimulating, but I didn't tease her insides too much or she'd choke.
"...Thirsty no more?"
"Mmph, phoo... Oppa, you're too much. For real."
"Sorry. But honestly, you made me this way."
"How'd I do that?"
"...You knowing it turns me on less than you pretending not to."
"Th-that's not something to say to your sister, Oppa."
"We've done and said everything we shouldn't by now."
"..."
"...Wanna get down?"
Suddenly moody—or maybe not, since she'd just begged to be put down—she now shook her head vigorously. Looked like a kiss fixed everything. Of course, I'd do anything she asked. Truth be told, I wanted to pound her till my back broke, but she was clinging so tight, one wrong move and we'd topple. So I walked to the sofa instead.
I sat in the same pose as our lover play at the hotel, looking up at her a bit. Didn't sit right. Lately, I preferred looking down. I buried my nose in her shoulder, inhaling deeply—not so much her moving by will, but matching the rhythm of her exhausted, quivering waist. Slowly this time, not rough, just enough to refill what we'd leaked on the walk, squeezing out every last drop of remaining cum carefully.
"...Hoo."
"Again...?"
"Yeah."
"For real... gonna get pregnant like this."
"It's fine. Doesn't happen that easy from just one or two times."
"That was three, Oppa."
"...Even three isn't enough."
"Feels like it will this time..."
"Let's head back to the room. Can't keep doing this in the living room."
"...Okay."
My body wasn't tired, but mentally, satisfaction maxed out. I pulled out, picked her up, and returned to bed. This time not crushing her—instead, facing each other sideways. Staring into her eyes, brushing hair behind her ear, it felt more innocent than lewd. Though I was naked. She basically was too. But we weren't doing anything dirty right now. Even after going at it like animals earlier.
"...Oppa."
"Yeah."
"About this..."
"What. ...Scared?"
"...Not really. I haven't taken it, for real."
"...Told you it doesn't matter."
"But you can't handle the responsibility alone."
"I know, me too."
"...So, I actually got it ready. That thing."
"What."
"Morning-after pill... Bought it ahead. They prescribed it. Lied for it."
...Honestly, I'd half-expected that. She's the type to prepare for everything before diving in. But instead of relief, I felt a twinge of disappointment. I knew it was disgusting, but the image of her pregnant with my seed—violating all morals, yet clinging desperately to me—wouldn't leave my head.
"...Why buy that? Bad for your body. Just take birth control pills. I wouldn't know if you lied to me."
"If you said weird shit... I wasn't gonna."
"Like what?"
"You were kinda trashy today, but if you suddenly drew a line? Or... went full scumbag on me like that... I wasn't gonna take it."
"You seriously thought about it?"
"...Yeah."
"...I that untrustworthy?"
"No, it's not... Just in case."
"Who prepares 'just in case' for shit like that?"
"...A brother who does this to his sister. Means a sister who does it back exists too."
"..."
We were so twisted. You and me. Nothing short of chopping off limbs would sever us now. Hell, maybe not even that. We'd spilled every weakness long ago—personalities, mindsets, habits all molded to each other.
"Truth is, I wanted to do this. Once."
"...This?"
"You're pitiful, Oppa. ...Not sure, but I heard guys feel the most pleasure then."
"It was a bit much. ...Don't do it again. Bad for you."
"Anyway. It was kinda like that. ...But you were more serious than I thought."
"You loved it too. For real."
"'Course. Seeing the guy I like go crazy wanting to impregnate me... heart pounding like mad. ...Might've meant it a little."
"..."
"I can't have kids... since it's wrong. But I had this tiny fantasy. ...Having your baby, Oppa. Living as three."
"...Gyeo-ul."
"Yeah."
"I wanna marry you."
"...Huh?"
I knew it was impossible, but she loved me anyway—seduced me knowing it, wanted to devote her life knowing it. I wanted to marry my sister. Because I knew it was impossible.
"...No thanks. Marrying you. Impossible from the start."
"What?"
"Lovers, spouses—all that. Hate it. I'm breaking up with you, Oppa."
"...Wh-why."
"...You're panicking hard. Not like that."
"Spit it out."
"Couples can break up. ...Even marriage ends in divorce."
We'd seen it once. Our mom who loved us so much, our dad who loved her—splitting up. You vaguely remembered too.
"Makes all that meaningless in the end. ...If it's real love, no need for marriage. It's just a contract for when love runs out. My opinion, anyway."
"..."
"So siblings is fine."
"...'Cause siblings can't break?"
"Yeah. Even if we want to. Even if we don't. As kids, as auntie and uncle, as grandma and grandpa... even dead. We're siblings."
If we weren't siblings. Would we crave each other this much? Never. You wouldn't love me like this.
"So I like staying your sister, Oppa."
"...Yeah."
"Lucky you're my Oppa."
"Damn lucky. I think so too."
"...You said all that, so you'll take full responsibility, right?"
"You said you like me trashy. Wouldn't that make me less trashy if I didn't?"
"I like my trashy Oppa... but I'd prefer you trashy only to me, not others."
"...Got it. I'll take responsibility. But you take mine too. No cheating. No talking to other guys. Ever."
"Don't worry, don't worry, dear brother?"
"Ugh, creepy. Can't you just say Oppa?"
"Why? You've done every dirty thing to your sister. Right, dear brother?"
Teasing me with uncharacteristic formality, poking my sides, she grinned ear to ear, delighted. Lying side by side, that smile inches from my face—it was so ecstatic, so beautiful, I wanted to protect it forever, no matter what.