Doing Something Bad (4)
I know.
What I'm doing right now isn't some pathetic little excuse about just getting it wet with spit.
It has a proper name. Fellatio.
"Mmngh... slurp..."
While Noona isn't here. Lying on Noona's bed, wearing Noona's dolphin shorts, tying my hair up with Noona's hair tie, pretending to be Noona, and diligently coating Noona's boyfriend's cock—that vicious thing shoved right in front of my face—with my spit?
...Ahaha.
Funny.
No. That's not it.
I'm diligently... giving a blowjob. Aren't I? Doing something dirty. Aren't I?
"Slurp... mmph, mmnngh..."
Honestly, being alone with my sister's boyfriend felt wrong from the very start. That's why I tried to keep some distance from you. And I actually did, right up until we started gaming together.
But you kept ending up in my line of sight. You were the first person who ever played with me, and for a newbie you listened surprisingly well. And because of the treatments, I kept ending up held in your arms. No matter how hard I tried to think of you as just a guy friend, in the end the thought of Noona's boyfriend kept jabbing at the inside of my head.
When I found Noona's secret browsing history—why I'd gone into delete browsing history of all things right then, what I'd been frantically erasing behind her back, that embarrassing reason—you, Seo Woojin, kept poking at it. One little slip and I really felt like I'd cross the line.
"......"
...Ah. Of course I haven't crossed it yet. Sex. We haven't done it. So far it's still barely safe.
...Right?
"Phaa... heh..."
I spit out the cock I'd been servicing in my mouth until just now and sprawl on the bed in an undignified heap, panting. Above the labored breaths I keep heaving—hek, hek—the cock, soaked through and pickled in my spit, twitching with pleasure, drives itself straight into my eyes.
It isn't my boyfriend's cock. It isn't even my own older brother's, the way incest couples do it, and it isn't some guy I met five minutes ago, the way a slut would take it. It's my sister's boyfriend's cock. And the more I chewed on that fact, the more shamefully it burned—which is why.
"Haaah... slurp..."
I carefully grip the base and lick hard at the frenulum under the head, flicking my tongue over and over. So I'd be even more ashamed. So I'd be even less able to tell Noona. So it would become a secret I'd have to take to the grave.
"...Hey. Lee Jiyoon."
"...What."
"Looks like you've got it all coated. No?"
"...There's still a little left. Wait."
"Where's it left?"
"You can't see it from over there. ...If you look up close, there's still a bit, okay?"
On the cock that ought to have been coated in Noona's spit, my own spit clings in thick strands and drools downward. I lick it up with my tongue and swallow it down again and again, then turn my head all the way to the side, gulp the thick head between my lips, and make vulgar sounds—slurp, slurp—as I coat Seo Woojin's cock in a fresh layer of my saliva.
...It's actually my first time giving a blowjob, but I seem to be doing all right. His hand has been on my head without permission this whole time, stroking, petting. Do that to your girlfriend, not me. I'm only your girlfriend's little sister.
"...Kkh... khaah...! Phaaah...!"
Annoyed, I shove the cock deep into my own throat myself, then pull Seo Woojin's cock out of my mouth—and between the glistening, sticky shaft and my lips, spit stretches out like threads of silk. Not one or two strands. Several. A scene that, if someone snapped a photo and sent it straight to Noona, would shatter our relationship as sisters on the spot. The moment it appears in front of my eyes, my lower belly twitches.
...Ah, anyway. Strings like these, I can just break them with my tongue...
......
...No, no. I can just snap them with my fingers. Yeah.
I pull the tongue that had been dazedly wiping my lips back into my mouth, snap the strands with my fingers, and stare blankly at the massive cock in front of me.
"......"
Even after all this, the root is still dry, and all kinds of thoughts flicker through my head. Like, if he actually slammed that all the way in, my insides would probably break. Or if Seo Woojin got worked up, ignored my little proposal entirely, and like a beast—thud, smack—drove that hideous thing in to the hilt... A dangerous curiosity like that. Things like that.
"...Seo Woojin. Don't just kneel there. Come a little closer."
"This is enough. Except for the root, it's plenty sticky."
"If we're doing it, finish it all now. Listen to me, dumbass."
"......"
"It's not even a blowjob. I'm just getting it wet with spit..."
I swallow what's left in my mouth, bury my head under Seo Woojin's stomach, and start licking his cock in earnest. My hands feel oddly empty, so I pretend it's a joke and grab it, shake it up and down with wet slaps, and—the way the sex jokes in games go—rub the head hard with my palm. Because he asks, in a voice thick with pleasure, whether I'm in my right mind, I pretend I don't really know what this is, pretend I'm innocent, and stroke the shaft even harder, slick and wet.
Licking the root like that, branding the smell of a man deep into my brain—and then, a moment later, I notice something.
"......"
My spit on Seo Woojin's cock, and the sticky precum mixed into it, were dripping onto Noona's pure white bedsheet, leaving grayish stains.
"......"
I stare at the sight for a moment, then roughly rub the bed with a spit-soaked hand to erase the traces, and put the cock back in my mouth, working my tongue.
"...You said you were just getting it wet."
"Yeah."
"Then why the handjob?"
"...So it'd spread evenly everywhere."
"......"
"Wh-why are you laughing? I'm right, aren't I? Did I say something wrong? Dumbass..."
Common sense says the moment you touch it with your hand, all that spit you worked so hard to coat it with gets stolen by your palm. Does Lee Jiyoon actually think that's a decent excuse? Or did she spit out an excuse that stupid because she figured I'd play dumb and let it slide, with all my blood rushed to my cock instead of my brain?
Too lazy now to even hide my smile, I grab the slender ankle of Lee Jiyoon—still talking crazy to the end—and lift it up onto my shoulder.
"Right. Setting that aside—act like you're really having sex with Noona?"
"...That would be better, yeah. What we're doing is sex practice, after all."
"I know that, but... you calling me sweetly, honestly it's way too awkward."
"...Shut up."
As if secretly embarrassed, Lee Jiyoon answers with both forearms pressed tight over her eyes the moment the blowjob ends.
...Interesting. That shut up—she never says it in front of me. She only throws it at Lee Hayun now and then. And yet today it feels like I'm hearing it once a minute. Same with how she texts me first when she's bored. Have I gotten as comfortable for her as her own sister?
I press Lee Jiyoon's soft thighs tight together and, shoving my spit-slick cock between them, say it.
"I love you, Noona."
"......"
Just like before. A whisper.
"Why aren't you answering. You're embarrassing me."
"...You said my acting was awkward just now."
"You'll get better if you keep at it. Just keep going. Otherwise how's it practice?"
"......"
"I won't tease you anymore, so do it even roughly. Or just do it without talking."
"...Wait a second. Let me... get ready."
"......"
"...I, I love you... Woojin..."
"I love you, Noona."
"M-me too. ...I love you."
Using the mumbling voice of Lee Jiyoon—ears flushed red—as my side dish, I drive my sticky cock between those pure white thighs. Lightly. Squelch. Squelch. Squelch.
Of course I don't slam the whole thing in. Only as much as Lee Jiyoon said. Careful, so it doesn't poke out past her thighs. And yet, slyly rough.
"...But Noona wants rape play, doesn't she."
"...Why does that...?"
"Saying I love you—thinking about it now, it feels a little off."
"...It's just play, for now."
"And if it's rape play, rather than thrusting this timidly..."
"Nnh... w-wait..."
Thud. Thud. Thud.
Instead of the sticky squelching from a moment ago, the sound of Lee Jiyoon's thighs slamming into my stomach fills Lee Hayun's bedroom. Under my downward gaze, the head—wet with Lee Jiyoon's saliva—bulges out with heavy thumps. Her lewdly stretched thighs get crushed, slap after slap, their shape warping. Startled by the body suddenly rocking and creaking, she peeks through the gap under the arms covering her eyes and stares straight between her thighs.
I slam my cock in as much as I want.
"This is the right way to thrust, isn't it?"
"...I-I don't know...! I'm not into that kind of thing...!"
"You have to answer as Hayun-noona. ...We're in the middle of sex practice."
"......"
"Not your taste. If it were Hayun-noona's taste, what do you think?"
"......"
Eyes covered, Lee Jiyoon barely manages to let out labored breaths. She stays quiet for a moment, then swallows and, squeezing her thighs tight, forces her voice out.
"That... that would be better. ...Forcing it all the way in..."
As if she herself has no particular interest in that sort of thing. As if she's only helping a friend practice.
"I'll lend you my thighs, so... ...practice."
Even though she just swallowed, drooling, at the sight of my cock poking out past her thighs. Shamelessly, at that.
...That look—to put it crudely, it was fuck-hot.
"Then I'll do it like before."
"Mm..."
Me too.
"I love you, Jiyoon... no, Hayun-noona."
"......"
I deliberately let Lee Jiyoon's name slip, then drive my cock—so full of blood I could go stupid—hard into thighs already a little dirtied with spit.
"...Answer me. It's embarrassing if I'm the only one doing this."
"Th-that, my name... I heard it..."
"Obviously a slip. ...You and your sister, one syllable apart."
"...You. When you have sex with Noona, never do that."
"I'll try."
As if I want to thrust into you like this. Not your sister. You. As if I want to shove this whole cock into you, I let Lee Jiyoon's name slip. I wrap my arms around the thighs of the girl too busy covering her eyes with her forearms, and keep thrusting between them until the wet slapping rings out loud.
All the while pressing down on the heavy urge to come that had risen from my balls.
"Hoo..."
"Nnh... mmnh..."
Lee Jiyoon's legs twitch every time my stomach meets her thighs. Follow that curve downward and I see it—the head, swollen so hard it juts out almost to her navel. Slowly raise my gaze from there, and I catch a glimpse of deep green eyes pretending to be covered, sneaking glances at the head.
...Well, of course. I'm leaking precum like I want to come right this second. She must be worried she won't know when the semen's about to spurt out.
"......"
There's a box of tissues right beside the bed anyway. It'll be fine.
I'd been holding back the pleasure that had been throbbing at the root of my cock ever since the blowjob. Now, sometime along the way, I press my stomach hard between Lee Jiyoon's sweat-slick thighs and let out a breath.
"...H-huh? Seo Woojin, wai—!"
Onto Lee Jiyoon's pale stomach. Onto the T-shirt shoved up past her chest. Onto the pitch-black dolphin shorts of Lee Hayun's that she'd deliberately changed into. So I can pour out semen thick as jelly.
"What if you come here...! No, stop, stop coming...! What if it gets on Noona's bed...?!"
Splurt. Spurt. Splaaash. Spurt...
Semen pours thick over the palm Lee Jiyoon frantically thrusts out. Startled by the heat, maybe—learning the temperature of semen for the first time in her life—she flinches and yanks her hand back. Thanks to that, the fierce ropes that follow meet no resistance at all and filthy her stomach into a complete mess.
"......"
"......"
From the pale underswell of her breasts to her navel. And below that, all the way to the dolphin shorts of her sister's that she'd changed into. Enough that the sticky clumps spurting out stain her in patches. Lee Jiyoon, treated like a tissue in her sister's place, stares blankly down at her own body until my orgasm ends.
A complete mess. Filthied with semen.