Chapter Index

    .

    …Wow.

    Unnie.

    Wait,

    …Whoa.

    Holy shit…

    “…Hhah, chh, hhuh… Hh… hhuh……”

    Beneath the oversized sleepwear hoodie that none other than my unnie had pulled up—

    The hand that had merely been interlaced with hers just moments ago now traced upward along her flushed, snow-white skin, reddened all the way to her ears.

    And this wasn’t even happening when they were alone in the living room.

    No, it was right in front of me, her little sister, watching blatantly.

    …So aggressively.

    Unnie, fumbling clumsily over the shadowed outline of his erection through his sleep pants.

    Seo Woojin, slipping his hand under her clothes to knead her bare breasts without restraint.

    The only sounds were the wet, messy clashing of their tongues.

    “…If you squeeze that hard, it’s… no good…”

    And yet, in the middle of it all,

    Unnie flicked her gaze toward me—eyes identical to mine—glancing over and over,

    As if deliberately wanting someone to hear,

    Spelling out every detail beneath that hoodie that didn’t need spelling out,

    Between the soft, wet sounds of their lips meeting,

    Tilting her head back prettily to make it easier for her boyfriend to kiss her.

    …Now I think I get why he said I “resemble” Unnie.

    Not that I’m fully convinced yet—it’s still just a guess—

    But he probably meant in… that kind of way.

    I mean, sure, I only knew Unnie as someone who wagged her tail like an excited country pup,

    But Woojin must’ve known what she was like in bed too.

    “Hhah… … Hhhaah…”

    Frozen in place, watching their little lovefest,

    The remote slipped from Unnie’s grip and clattered to the floor.

    A brief “Woojin-ah” slipped between their kisses,

    But Unnie never got the chance to pick it back up.

    Whether he was genuinely that worked up

    Or just pretending to be,

    Seo Woojin ignored his girlfriend’s words, tugging her clothes up as if undressing her himself,

    Draping them over her chest.

    “Woojin-ah… Hey… Jiyeon’s watching…”

    Right in front of me.

    Unnie’s body.

    …Unlike mine, marked with a couple of love bites,

    Was put on full display,

    Too busy to hide.

    “If you’re embarrassed, cover yourself. You’ve got hands, don’t you?”

    “…You’ve already seen it all, so… whatever.”

    A sight I’d only imagined a few times in my head,

    One I’d scoffed at, thinking I’d never actually see.

    But now that it was unfolding right before my eyes,

    Between the anticipation

    …And the jealousy,

    My heart was pounding way too fast.

    “…And how long do you plan on fondling my dick?”

    “…This, well… If I get it hard now… it’ll be easier later…”

    Even Unnie’s cherry-pink nipples, stiffened from just a little attention from Woojin.

    The faint teeth marks beside them, clearly from being bitten earlier in the room.

    The reddish love bites standing out starkly against her milky-white chest.

    Staring at them quietly just kept putting bad thoughts in my head.

    What if Unnie saw me dirtied up even worse than that?

    What if Woojin made me… finish even more messily than he did with her?

    I couldn’t help but wonder how she’d react.

    …I was getting wet just thinking about it.

    “……”

    So, listen.

    Sorry to ruin your little victory lap of superiority over Unnie, but—

    “…Woojin-ah.”

    “Hey, wait… Jiyeon, why are you—”

    Just let me butt in a little…?

    Later might be different, but for now, I’ll play the loser role perfectly.

    …The little sister who feels inferior to her unnie.

    I’ll do it flawlessly.

    “…You like this more than just having your chest touched, right?”

    “……”

    “Unnie… do you do this for him…?”

    “……”

    “You don’t, do you? Because it’s gross? …And sex with you must be boring as hell. …I can kinda tell.”

    Like this.

    Crawling between your legs.

    Sniffing the scent of your cock through your sleep pants…

    Instead of lips meant for Unnie, pressing a light kiss right here.

    Lick, lick.

    Not even tasting you yet, just the fabric, but I’ll still lick it tenderly…?

    …Just now, you were pretending to be all worked up next to Unnie,

    But now, looking down at me kneeling between your legs, you’re smiling faintly.

    And right now… your dick twitched.

    Can I take that as a yes?

    “…I-I can do that much too… …Ah…!”

    Just as Unnie, sitting beside you, tried to counter by saying she could give head too,

    I ignored her and tugged Woojin’s sleep pants down insistently.

    Since he was sitting on the couch, I couldn’t pull them all the way off,

    But somehow,

    I managed to free his half-hard cock,

    Pop,

    Right in front of Unnie and me.

    “…Hahh, chh…”

    Just like how Unnie kissed Woojin,

    I gently licked beneath the glans, not yet fully swollen, with my reddish tongue.

    …Even though my back was trembling with embarrassment,

    Like a pet desperate for Woojin’s affection,

    I started making kissing sounds against his tip.

    “…Hhahh… Ah, so embarrassing…”

    Mwah, mwah.

    If you only listened with your eyes closed,

    You’d mistake it for just light kisses.

    And then, instead of Unnie, I’d take over,

    Ready to swallow Woojin’s sticky desire…

    …Or so I thought.

    “…Don’t look at that.”

    Unnie, who had been sitting quietly beside Woojin just moments ago,

    Suddenly climbed onto his lap, clinging to him,

    Forcing me to scoot back a step.

    “Ah, shit… What are you doing?”

    “What do you mean? …I’m the one who should be doing this, why are you?”

    “……”

    “Just sit quietly and watch TV. Or go to your room. …Stop trying to get in the way.”

    It is Unnie’s place to do this. Right.

    Telling me to watch TV. Right.

    And yeah, I was just trying to get in their way… …Fair.

    Maybe it’s because I’m not shameless enough yet.

    As I faltered, averting my gaze, Unnie—her arms wrapped around Woojin’s neck—leaned in and whispered loud enough for me to hear:

    “Woojin-ah. Do you like… blowjobs?”

    “……”

    In a soft, affectionate voice.

    Saying she could do that for him anytime.

    “Why didn’t you tell me? …It’s not like it’s hard. Well, last time I did it, you seemed… to like it.”

    It’s not just you, Jiyeon.

    Unnie’s done it too.

    “Before bed tonight… After everything’s done, I’ll do it one last time. That… cleanup blowjob… …Okay?”

    Foreheads pressed together, creating their own little space.

    Close enough to feel each other’s breath.

    Whispering.

    Loud enough for me to hear.

    “So, before I get all dirty with your cum… …Let’s keep kissing?”

    Holding each other tightly,

    They resumed their sloppy, wet kisses.

    “Mmm… chh… Hhuh…”

    …Somehow,

    It didn’t feel like acting anymore.

    More like…

    Genuine disgust.

    “……”

    Beside the two of them, locked in their embrace,

    I climbed onto the couch, kneeling to meet his eye level,

    And shoved my face right next to their glistening lips, wet from all that saliva.

    “Hey—what, what are you—?!”

    “What does it look like?… Something similar to Unnie.”

    “We’re not even dating, and you’re trying to kiss—”

    “Then save the kisses for your girlfriend, Unnie. I’ll just do… this.”

    …Would “mistress” be the right word?

    Something fitting for my position—

    One-sided seduction.

    “……”

    While Woojin was kissing Unnie,

    I pressed my lips to his unclaimed cheek.

    Nibbled his ear.

    Trailed down,

    Licking his skin teasingly,

    Down to his masculine shoulders,

    His arms,

    The back of his hand,

    Leaving my marks before Unnie could.

    Finally reaching the very end—

    His fingers.

    “…I like you.”

    “……”

    “I like you. I like you…”

    Choosing the words Unnie would hate the most,

    Lick, lick.

    The tips of his fingers.

    The spaces between.

    Even his palm.

    Diligently coating them with my saliva.

    …Before Unnie, like a territorial pup, could mark him with her scent.

    I’d do it first.

    Me.

    “Hey, Jiyeon…! He’s my boyfriend…?”

    “I know. I just like him… …Why? Are you scared Woojin might switch to me over something this small?”

    “…That’s not it.”

    “Sure seems like it.”

    “I said it’s not!”

    Just a little poke, and she exploded with the exact reaction I expected, glaring at me.

    Then, as if I weren’t even there—

    No, wait.

    More like making sure I was watching,

    Unnie resumed her sweet, intimate contact with Woojin.

    Alternating between watching her and Woojin’s occasional glances at me,

    I carefully

    Set a trap.

    For me.

    …And probably for Woojin too.

    “Then how far are you confident, Unnie?”

    “…Huh?”

    A trap.

    “You just said something this small doesn’t scare you.”

    Smirk.

    It’s been so long since I’ve made this expression that I almost forgot how,

    But for some reason, it came out naturally now.

    Rolling the tip of Woojin’s finger with my tongue, I continued.

    “…How about this? Feel anything?”

    “…Not really.”

    He definitely looked like he felt something.

    But his pride wouldn’t let him admit it.

    I exhaled a quiet laugh and leaned closer to Woojin’s cheek.

    “How about this?”

    “……”

    “Hey. That tickles… Stop.”

    Maybe because I was nibbling his ear this time,

    His reaction was a little stronger.

    But so far, it was just his eyebrows twitching cutely.

    …Disappointing. If Unnie exploded, it’d be game over, so I couldn’t push that far, but…

    I wanted a slightly riskier reaction.

    Not sex. Not yet.

    “Risky” is an understatement—the moment I brought it up, Unnie would slap me so hard I’d faceplant into the couch.

    Which would leave things like…

    Foreplay.

    …Or,

    Kissing.

    “…H-Hey, wait…!”

    The moment the thought crossed my mind,

    I—

    Wedging my head between Unnie’s unamused stare and Woojin,

    Swiftly.

    “……”

    …For the first time,

    Right in front of Unnie,

    I kissed her boyfriend.

    Less a kiss, more a peck.

    No swapping saliva, no shared breath.

    After pulling away,

    Unnie shoved me off the couch.

    “Pfft… …What? Scared of a little kiss?”

    “You… you…”

    …Well, I was satisfied.

    Watching Unnie, her ears and cheeks burning red,

    Stammering like a broken record.

    “…Ah, Unnie… Guess you’re not confident with the dirty stuff, huh…?”

    “…Says who?”

    “Kissing… …Sex, stuff like that.”

    “I finished a whole condom before you even—!”

    “Yeah, but I came outside without one, remember?”

    “……”

    …Pfft. …I won, didn’t I? Unnie.

    “…You. Stay right there.”

    Watching Unnie suddenly head to her room—probably to grab something—

    “…Caught you? You came on my uniform?”

    “Yep. I planned it from the start? …To piss Unnie off.”

    “…You crazy bitch.”

    Twitch, twitch.

    I could have let myself finish happily, but…

    Well.

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