Seohee Needs No Training
It was one of those days Seohee would be coming home late, so I spent it thoroughly satisfied. Forcing Mom and Dohee to keep pretending they knew nothing about each other was already reaching its limit; I drifted off thinking that soon enough the three of us would simply be having sex together, and I sank into a deep, heavy sleep.
Squelch. Squelch. Squelch. Squelch.
Huh? What is that?
Alternating between the two of them had left my body pretty exhausted, so I'd dropped into a sleep deep enough that ordinary shocks wouldn't have woken me. I'd gone under comfortably—until, at some point, a strange sound and a pleasantly tight grip around my lower half began to pull my consciousness back to the surface.
Don't tell me… Mom? Dohee?
My body still wouldn't move, but my mind had cleared enough to start piecing the situation together. The sensation was familiar and brand-new at the same time: someone was riding me in the cowgirl position. The strange part was that I'd fucked Mom's and Dohee's pussies countless times; I knew those feelings cold. What I was feeling now was a tightness and texture I had never experienced before, and that left me puzzled.
Is it because I was asleep?
I wondered if the depth of my sleep was just making everything feel different—and then my mind woke further, my body stirred, and my eyes opened.
"Nn……?!?!?!?!?!?!"
As my eyes opened, I slowly took in the sight of someone naked moving on top of me. The blurry haze cleared little by little until the figure above me came into sharp focus—and it wasn't Mom or Dohee. It was Seohee.
"Seohee?!?! W-wait!! Ngh!!"
Seeing her snapped me fully awake. Seohee was looking down at me with her usual blank expression, naked, having sex with me. I called her name in a panic and tried to sit up—but the timing was terrible. I came. I hadn't realized it while I was asleep, but the urge had already built so high that the moment I woke, I climaxed.
"Mm🤍"
When I came, Seohee seemed to climax too; a soft moan slipped out of her. Her face barely changed at all—I only knew from that brief sound and the sudden clench around my cock.
Ah… my head…
Between my exhausted body and the post-orgasm crash, I felt my consciousness slipping again. I wanted to demand right then and there what the hell she thought she was doing, but my eyelids were closing against my will, and I sank back under as if I'd blacked out.
"Mmm🤍🤍 Hoo… Oppa?"
After her climax, Seohee called out so she could properly face the brother who had woken—but for some reason he had fallen asleep again.
"That's… a shame…"
She'd wanted to go at it hard with him now that he was awake, but since he'd drifted off again, Seohee had no intention of forcing him up. She carefully lifted her trembling legs and pulled his cock free.
"Nnnn🤍🤍"
The long shaft dragged against her walls on the way out, and because the aftershocks of her orgasm hadn't faded yet, she kept feeling it the whole time she withdrew.
Pop~
With a clean little sound his cock slipped free. Seohee gave one full-body shiver, then looked down at her oppa's cock, slick with lube and cum.
The cock that had just violated her ass looked far more obscene in person than it ever had in porn or photos, and it carried a thick, powerful male scent.
"Ha~ah🤍"
Without the slightest hesitation, Seohee took the cock that had been inside her asshole into her mouth and began cleaning it the way she'd seen in videos.
"Mmmp🤍 slurp🤍 Mmmp🤍"
It was her first time doing cleanup, but she'd watched it hundreds of times on video and practiced on bananas, so she was surprisingly skilled and left his cock spotless.
"It's… tastier than I expected…"
People who actually sucked cock always said it didn't taste good, but to her mouth it was incredibly sweet. Seohee gave a satisfied little nod, finished tidying up, and left the room as if nothing had happened, returning to her own.
"From now on…… take care of me…… Oppa."
She left those meaningful words for an oppa who couldn't hear them, then fell asleep with the same blank, expressionless face she always wore.
"Waaaaah!! Huff! Huff!"
I bolted upright out of sleep and frantically checked myself over.
"What the hell?"
I was certain Seohee had come in and had sex with me while I was asleep last night—but there wasn't a single trace.
"Was it a dream?"
She'd cleaned up so thoroughly that I even started to wonder if I'd imagined the whole thing. But the sensation I'd felt on my cock and the memory itself kept stirring up confusion.
"Am I just that tired?"
The idea that Seohee had suddenly jumped me in my sleep and fucked me felt so unreal that the thought it must have been a dream drove itself deep into my head.
"Yeah. A dream…… right?"
Still unsettled, I left my room.
"Morning…… Oppa."
"Y-yeah? Sleep well, Seohee?"
"Mm…"
Running into her the second I stepped out made things feel awkward, but Seohee greeted me with her usual blank face.
It really was a dream, then?
Even for Seohee, to do something like that and show absolutely no change in expression… I decided it had to have been a dream and went through a perfectly ordinary morning.
Mom and Dohee had gone at it so hard the day before that neither of them went into heat or tried to seduce me at breakfast. Both of them had texted me saying they'd do it tonight, so I saw them off with a thoroughly satisfied smile.
"Seohee, you're not going to school today?"
"Today…… class is canceled.."
"Got it. Then Oppa's gonna go work, so……?"
I told the girl who wasn't going to school because of the canceled class that I'd get some work done and turned to head back into my room—when Seohee caught my arm.
"What's up?"
Surprised by the unexpected move, I asked again. Seohee opened her mouth in her usual flat tone, though her face looked just a little more flushed than normal.
"Last night's sex…… how was it?"
I realized the night hadn't been a dream at all, and cold sweat broke out on me.
"Did you… hate it?"
"N-no!! I was just… a little startled."
Her completely calm expression threw me completely. Seohee barely ever changed her face to begin with, but I never imagined she could do something like that and still look this blank.
"So…… last night you came into my room and…… uh……"
"Yeah…… I went to Oppa's room…… and had sex……"
That utterly shameless attitude made me swallow hard as I stared at her. The memory of her naked body from the night before rose up, and my body responded with honest, traitorous hardness.
"Wanna…… do it again?"
"Seohee!"
I couldn't hold back any longer. I shoved her up against the wall. The face looking up at me didn't change, but I could feel the excitement in her eyes. And her hand naturally found my cock through my pants, stroking it, stoking every male instinct I had.
"Mmmp🤍 slurp🤍 Mmmp🤍"
I couldn't take it. I kissed her straight on the mouth. Seohee offered no resistance at all—she accepted my mouth and was the first to push her tongue out, turning it into a filthy, wet kiss. With a sudden move like hers, the smart thing would have been to sort out the situation first—but her provocative behavior left no room for thoughts like that.
I'd only ever thought of her as my cute little sister, but Seohee had an obscenely sexy body too. Her chest was an F-cup—smaller than Mom's or Dohee's, but still big—and her short height only made it look bigger.
Squish.
"Mmph🤍"
When I groped her breasts, there was no bra where there should have been one. The little nubs under my palm made it crystal clear she wasn't wearing one right now.
"Haa🤍 Haa🤍"
After three full minutes the kiss broke, and a string of our saliva stretched between our mouths like a thread, only deepening the filthy atmosphere.
"Is it…… hurting here?"
"Seohee."
"Mm…… okay…"
Without another word she turned around and stripped off the skirt she was wearing. As if she'd expected this and prepared for it, the moment the skirt came off her pale, round ass was right there in the open.
Seohee had clearly come ready for sex; her pussy was already slick and messy with her own juices. I couldn't hold back. I yanked my pants and underwear down in a rush. My already hard cock twitched like it wanted inside her this second.
"Then…… you can put it…… in here."
"!!!"
What she did next stunned me. I finally understood what that unfamiliar sensation from the night before had been.
As if it were the most natural thing in the world, Seohee ignored her pussy, grabbed her own asscheeks, and spread them left and right. She presented that hole I'd seen plenty of times but never used—her asshole—winking open, asking me to put it in.
"Kh!"
Squelch!
"Ooh🤍🤍"
Twitch. Twitch.
Seohee's asshole took me in far more smoothly than I'd expected. The girl who'd ridden me so easily on her own last night clenched down hard the moment I simply pushed inside, and she squirted from her pussy like she was pissing as she came.
"Seohee!!"
Squelch! Squelch! Squelch! Squelch! Squelch!
"Ooh!🤍 Mmp!🤍 Ahn!🤍"
Doing it with Seohee—and doing it in an asshole I'd never touched, something I'd thought was still a long way off—sent my excitement through the roof.
Seohee was clearly feeling it hard too; short, animal little moans kept spilling out of her.
"I never knew you were this filthy. You like it that much?"
"Like… ooh🤍 ah…"
The tone of her voice never really changed, but those moans in between were enough. Unable to hold back the rush, I slapped her ass.
SMACK!!!!
"Ooooh🤍🤍"
I'd done it without warning; she might have hated it—but instead Seohee only clenched her asshole tighter around me.
My handprint bloomed red across her pure white ass like a brand.
"You get off on getting your ass smacked, you filthy little slut!!"
"Ooh🤍 I… like it🤍"
Far from rejecting what I was doing, she only seemed to love it more. Seohee turned her head and looked back at me.
"Oppa…… do whatever…… you want with me🤍"
That single line from her snapped the last thread of reason I'd been clinging to, and I started properly ravaging Seohee.