Chapter Index

    .

    Clink.

    There was no sound of a phone being set down from the other side of the speaker.

    Seo Woojin’s phone must have been slightly too far away to pick up such a quiet noise.

    But even without that,

    I could easily picture what was happening over there.

    – Ahem, hmm…! H-Hey, come here. …I’ll put it on for you. – You’re right in front of me. – I-I’m just saying…! …Hic…

    Lee Hayoon, who had frantically texted me earlier.

    …No,

    Unnie was now setting her phone down and fumbling with a condom wrapper.

    She must have pulled out one of those vitamin-shaped condoms,

    then held it up to—

    Seo Woojin’s cock.

    Carefully sliding the condom on.

    Not out of fear of pregnancy,

    but because she wanted to get railed by that dick all night.

    – U-Uh, um… I-I think it’s on…? – It is… …Now lie down properly.

    A brief silence, then the rustling of bodies shifting.

    Even as I busied myself with squelching my fingers inside me, the image of them burned vividly in my mind.

    – H-Hey…! It hurts…! – You use your body all the time—how is this what hurts? – Flexibility and this are two different things…! Hng…

    Unnie, stiff from inexperience.

    Seo Woojin, forcing her thighs apart with a firm push.

    – Ugh… Seriously…

    Unnie, covering her face in embarrassment with her own arm.

    Rather than prying it away to see her expression,

    Seo Woojin just rested his cock on her lower belly—just like he’d done with me.

    – …W-Wow…

    Unnie, trembling, finally lowering her arm just enough to peek down.

    Then, on that lower belly, just below her navel,

    right beside her pussy, over the panties bunched to the side—

    he smeared a generous amount of condom lube.

    – Ngh… Hng… – Relax. If you’re this tense, it’ll be hard to put it in. – I-I’m not tense…! It’s just… it hurts… – It’s fine. Pain is normal… …Bear with it. – “Just bear with it”? How irresponsible… Hah… – …You’ve gotten hurt a lot. You should be used to pain by now. – I… guess so, but…

    Seo Woojin, taking his time with Unnie’s tight virgin pussy, easing it open as he pleased.

    Their images carved themselves into my mind like a branding iron.

    …Well, the only certain thing was me, face-down on the bed, too busy clawing at my soaked cunt to care.

    Isn’t it fun?

    These fantasies.

    …And how fucking hot they are.

    – …Halfway in. …How is it? Okay? – I-It’s okay… – You said it hurt earlier. Really okay? – …If I said no, would you stop…? – For now. – …Then, it’s okay… – …… – Y-You can… fuck me however you want… idiot…

    A voice I’d always found a little cute—though usually so naggy I secretly hated it—

    now dripping with nothing but sweet, spoiled affection for Seo Woojin.

    No matter how you looked at it, she sounded less like an older sister and more like a little sister.

    …No, more like a horny little sister.

    – However I want? – …… – Then it’s fine if I shove it all the way in? – …Mmm…

    Pfft… Lee Hayoon, you fucking slut.

    She said it’s fine if he rams it to the hilt.

    From what I remember, he’s easily over 20cm.

    Guess she’s lost all sense of reality from watching too many videos where only huge dicks show up.

    If she genuinely lets that thing wreck her all night, how’s she gonna go to the academy tomorrow?

    What, planning to declare a personal holiday or something?

    Gonna claim she suddenly fell ill?

    Too bad.

    With a healing transcendent around, that excuse won’t fly.

    …Might as well show up covered in hickeys and let everyone whisper.

    “She got dicked down all night, huh?”

    – If it goes too deep, it’ll hurt even more. – L-Last time with you… Hngh…

    Last time?

    The offhand comment left me dazed for a second—

    until the wet sound of kissing started up again.

    And then,

    between those sweet, sloppy kisses—

    – Ngh… Chup… Hah…?!

    Squelch, squelch—the sound of slick skin slapping together,

    the gasps slipping between their lips,

    all leaked through the phone speaker, teasing my eardrums.

    …Is Seo Woojin really thrusting all the way in?

    Is Unnie really panting like that because of it?

    – Hah… S-Seo Woojin… stop kissing… – …Too much? Can’t breathe? – Mmm…

    Unnie’s voice, laced with a whiny sweetness she’d never use with me, flowed through the speaker, filling the room.

    This is why…

    It feels like Unnie and Seo Woojin are fucking right next to me.

    Like I’m hiding somewhere, watching them in secret.

    A very strange feeling.

    – …At least you’re not saying it hurts anymore. – ……

    Lost in that strange sensation,

    I rolled onto my side, fingers working furiously between my legs.

    If it were me over there, would Seo Woojin have been this gentle?

    If it were me, wouldn’t he have already been pounding like an animal—just how Unnie likes it?

    Which means… he finds me hotter, right?

    Lost in my delusions.

    – Keep going like this? …Or change positions? – J-Just like this… – …Later, I might pin your thighs down and go wild. That okay? – H-Huh… – If you don’t like it, we can switch to the side or— – N-No… I didn’t say I didn’t… – …… – Ah— You startled me…

    Does this mean he finds me hotter—the one he can use as he pleases under the guise of “practice”—

    rather than Unnie, who he can’t be rough with right away because she’s his girlfriend?

    Delusional?

    Maybe.

    But this is…

    …a victory masturbation session.

    – Ah… Ngh……

    A sharp shhk— the sound of friction as Unnie’s body was pulled closer.

    Not squelch, squelch—

    but thud, slap, thud, thud.

    The sounds of sex, loud enough to fill my room.

    Hah…

    The lewd moans spilling from Unnie’s clenched teeth.

    Hearing it all,

    I hooked one leg up,

    fingers rubbing furiously at my oversensitive, throbbing walls.

    – …Hayoon. Stop covering your face. – H-How can I not…?! Because of you, because of you…… – Whether you’re crying, smiling, or a complete mess—you’re hot no matter what. So lower your arms. – No…! I’m embarrassed…! Kyaah…! – …Tch. Fuck. – ……… Hieh… …Ngh. I-It’s… too rough…

    Why?

    Unnie, what face were you making just now?

    Why are the sounds of his cock slamming into you so much faster than before?

    …And why have your moans been nothing but shameless filth this whole time?

    Pinching my stiffened nipples hard enough to sting, I glanced at the mirror in the corner.

    Unfortunately, my face wasn’t visible from this angle—so I wobbled up and flopped onto the bed, peeking again.

    The face reflected back was—

    tear-streaked like I’d been crying,

    flushed like I was embarrassed,

    twisted in pleasure like I was feeling too good—

    a complete, ruined mess.

    – Open. Wider. – Huh…? Hah…? – Don’t just pant with the tip of your tongue out—properly wider. – …Aaah…

    The faint tenderness I’d sensed from the start.

    Now laced with something thicker, needier.

    After Unnie’s “Aaah…”—

    everything fell silent for a brief moment.

    …No idea what they were doing,

    but I think I heard a few gulp sounds—

    Chup… chup…

    Then the wet noise of kissing mixed with thrusting resumed.

    Guess Unnie was doing something to make his cock throb again.

    Ahaha…

    – …Hah… Hey, Woojin… Woojin-ah… – What. – I’m… cumming too much… My head’s going blank… Let’s… rest… – …How many times? – Five… no, six… Ngh… S-Seven… – …… – S-Stop fucking me…! Listen…! – I’m this hard—how am I supposed to stop now? – But… I can’t even talk right…

    The sound of Unnie’s pussy being pounded drowned out her voice, assaulting my phone speaker.

    Her cute, lewd moans were swallowed by the filthy noises of sex.

    Me too…

    Did I sound like that when Seo Woojin fucked me?

    Remembering the time we did it bent over the desk—

    …and how I only moaned freely after smashing my headphones—

    I burned up so much my scalp tingled.

    I’d even forgotten I’d muted the call,

    one hand clumsily muffling my moans (uselessly)

    while the other rubbed my clit like mad,

    splattering slick all over the already soaked towel beneath me.

    – I’m… cumming again… – I know. I can feel you clenching around me. – T-Then why’d you ask earlier?! – …Hearing it from you is hotter. Dummy. – Ugh… D-Don’t tell me you made me call you “oppa” because… – A little different… but yeah. – You…! Pervert…! Total pervert…!

    Even as Unnie and Seo Woojin caught their breath mid-fuck—

    Squelch, squelch… squelch.

    Too lost in my own pleasure,

    I heard none of it.

    – You, acting all high and mighty as my “noona,” suddenly getting shy and calling me “oppa”? So fucking hot. – W-What’s hot about that…?! Just ask for a blowjob or something…! – You don’t like calling me “oppa”? – …I don’t hate it… – Then use it more. …Like when you’re making me cum. – M-Making you… – Told you. You being all shy and polite? Drives me crazy. – Ah— Fine! But stop saying it’s hot while looking down at me…!

    My vision darkened.

    My mind went blank.

    Burying my face in the pillow to stifle my gasps,

    I kept chasing that filthy, thrilling pleasure.

    …I don’t think I’ve ever masturbated this long before.

    Should’ve recorded this call to use later.

    Chances like this won’t come again.

    – …O-Oppa… – …… – …Cum inside me… as much as you want… Ngh…

    Will I get to “practice” with Seo Woojin again?

    That thought lingered as—

    Squelch,

    squelch.

    …Splurt.

    – Hah… Hah…… …You… monster… Stop cumming… – It’s fine. Condoms don’t break from this. – Not that…! The… swollen condom keeps hitting my… – …… – …N-Never mind…!

    Pulling my soaked fingers from my abused cunt,

    I turned away from my phone, panting heavily.

    I’d told myself this was a “victory masturbation”—rubbing one out after stealing Unnie’s boyfriend first.

    But now, it feels more like a defeat.

    …Since Seo Woojin’s goal is complete,

    I doubt I’ll get to fuck him again.

    My shameful kinks? Probably over, too.

    All that’s left is this hazy, defeated exhaustion—

    “……”

    …No.

    Why should this be the end?

    There’s still ways to meet Seo Woojin behind Unnie’s back.

    And ways to fuck him even dirtier than her.

    The options are still there.

    [Lee Jiyoon]

    – Dumbass. – I told you how to do it, and you still suck. – Unnie’s a masochist—I said to go way harder than that. – Pussy. Scared of your own girlfriend. – Can’t even game or fuck right. – We’ll “practice” again next time. Moron.

    If I just send texts like this,

    I can cheat with Seo Woojin whenever I want.

    Unless he says no…

    But he won’t.

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