Sin x Secret
Supergirl. Baby Danvers x Lena Luthor. Kara Danvers. Alex Danvers. Kelly Olsen. Nia Nal.
Word Count: 3.9k
âSo that's it?â Lena asks, voice low and uncertain, as if the answer might kill herâeven though sheâs the one who said it first. âWeâre⊠done?â
âYeah.â You canât believe the word comes out of your mouth. How can you and Lena be breaking up when you love her so much? âIâI think so.â
You just sit there, staring at each other from opposite ends of the couch. Silence settles between you, heavy and fragile like glass.
âThereâs just one tiny thing,â you say. Lena raises an eyebrow. âAlexâs engagement party tomorrow.â
âOh, fuck. I forgot about that.â
You both groan at the same time, and itâs almost funny. Almost comforting. Almost like nothing's changed. But it has. Everything has changed.
âLook,â Lena says, folding her hands tightly in her lap. âI donât want to lie to anyone, butââ
âTomorrow isnât about us,â you complete. âWeâre not going to ruin their party. We can tell them afterward.â
Lena nods, slow and reluctant. âRight. After.â
For a second, it feels like youâve agreed to more than just a secret. It feels like youâre promising not to fall apartâat least not where anyone can see.
She stands, smoothing her clothes even though sheâs in pajama shorts and one of your old hoodies. âWe should figure out how weâre going to play this.â
You force a weak smile. âYou mean how to fake being in love with you for an entire evening?â
Lena looks at you. Looks through you. âI donât think either of us has ever faked that part.â
Itâs a punch to the chest, the way she says it. Soft. Honest. Dangerous.
You look away. âOkay. So weâll do our part. Weâll smile, hold hands, take pictures, laugh at Karaâs dumb speech, slow dance if we have toâŠâ
"Kiss?âÂ
Itâs a simple question. An obvious one. But it knocks the air out of your lungs. Because yeah, youâd kiss Lena in a heartbeat. Youâd kiss her right now.
But what if you canât stop? What if her mouth ruins you all over again? What if it feels like home, and you have to walk away from it anyway?
âI donât know,â you admit, voice hoarse. âCan you?â
Lena doesnât answer right away. She just stands there in the doorway, hands clenched into the sleeves of your hoodieâhers now, you guess. Her eyes are glassy in the low light. You canât tell if itâs anger or heartbreak or both.
âIâll try,â she says finally. Then adds, quietly, âIf you can maybe not⊠um, do that thing.â
You blink. âWhat thing?â
Lenaâs cheeks flush red. She looks anywhere but at you. âYou know, the thing with the tongue andââ
âOh. Right. I wonât do the thing.â
You nod solemnly, like youâre making a vow. Even though you have no idea how not to kiss Lena with everything inside you. Thatâs the only way youâve ever known how. Like itâs the last time. Like sheâll vanish if you donât kiss her hard enough to keep her tethered.
She hugs herself. âThanks. Itâs just⊠I canâtââ
âI get it,â you cut in gently. âMe too.â
A beat.
Then Lena gives a small, crooked smile. âSo weâre fake-dating tomorrow, but without the tongue.â
âRight. Strictly PG-13.â You try to match her tone. Light. Casual. Like your chest isnât cracking open.
âAnd the day after the partyâŠâ she starts, but her voice wavers, and she lets it trail off.
âWeâll tell them.â
And just like that, the clock starts ticking on the last day you'll ever be hers, even if this time is just pretend.
You're late, which is not surprising to anyoneâthough they act like it is. You've tried being on time before, you swear, but time is a construct and it used to move completely differently on Krypton, so really, itâs not your fault. Besides, being able to cross the city in under a second has made you... a little lax with punctuality.
âYou're late,â is the first thing Lena says when she opens the door to her penthouse.
And it hits you like a slapânot her words, but her. The way she looks. Her hair woven into the prettiest braid, neat and effortless in that way only Lena can manage. The black dress fits her like a whispered promise, hugging every curve you know by memory nowâeach line of her body a path your hands used to trace in the dark. And then there's the slit in the front, plunging too low, revealing the soft line of her cleavage. Your eyes follow it without thinking, like a reflex. Like your body still hasnât caught up to the part where youâre not allowed to anymore. She looks like a sin dressed in silk. Like a secret you can't keep.
Your mouth goes dry. âAnd you look too good. Can you change?â
Lenaâs brow lifts. âWhat? No, I'm not gonna change. We're late!â
âFine,â you mutter, dragging your eyes away from her cleavage. âBut just so you know, you're making this a lot harder than it has to be.â
She laughs, light and unbothered. Like she didnât cry into your hoodie last night. Like she hasnât been sitting in your chest like a bruise ever since.
âLetâs just go, Y/N.â
By the time you walk into Alex and Kellyâs apartment, everyoneâs already gathered in the cozy living room. Balloons tied to chairs, silver and white streamers trailing from the ceiling. A homemade banner that says She said yes! hangs crooked above the fireplaceâKaraâs handiwork, probably.
Alex spots you first and lights up. âFinally! We were starting to think you two got distracted on the way here.â
You laugh too fast. âTraffic.â
âOh, thereâs traffic in the sky now?â Kelly teases, handing you both drinks with a wink. âIâm just impressed you two managed to get your hands off each other long enough to show up.â
You nearly choke. Lena just takes a sip of her wine, cool and unreadable.
You glance at her out of the corner of your eye, searching for somethingâconfirmation, a crack, anything. But she doesnât flinch. Sheâs always been better at pretending than you.
And thatâs the worst part: this used to be effortless. This used to be real.
Now, every second feels like you're trying to hold on to something that's already slipping through your fingers. And you can't even grieve it. Not here. Not tonight. Not when everyoneâs watching and expecting you to smile like nothingâs wrong.
So you smile. And you drink. And you try not to look at Lena too long, or remember what her laugh used to feel like when it was only for you.
But your heart is already screaming.
Thereâs music and dancing and laughter in the background. You hear itâsort of. It slips through the noise of your own mind, screaming at you to act normal. Just one more hour. Just one more moment. Just get through this.
Then comes the call for a group photo. Someone corrals everyone in front of the banner. Alex is glowing. Kelly is beaming. You try to stand behind Kara, butâ
Nia elbows you gently. âHere, switch with me so youâre next to Lena.â
âOh, itâs fine,â you start to protest, already backing away.
But sheâs already moving.
And suddenly Lena is beside you, her perfume subtle but devastating, her hand sliding around your waist with practiced easeâlike this is just another Saturday night, like nothing has changed.
You canât breathe.
âSmile, darling,â Lena murmurs beside you, the word slipping out too easily, too naturally.
And thatâs when your brain stops working altogether.
Because itâs not the nickname. Not the hand at your waist. Not even the practiced smile she gives for the camera.
Itâs the fact that, for one terrifying second, you almost forget youâre pretending.
You almost lean into her. You almost kiss her temple. Â You almost believe you didnât lose her.
And it guts you.Â
Later, youâre sitting alone on the loveseat, nursing your drink and trying not to look like youâre watching Lena. But, of course, you are. How could you not? Sheâs across the room, laughing at something Mâgann said, her fingers twirling the stem of her wine glass, legs crossed like a goddamn movie star.
Your heartâs in your throat where it has been all night. Itâs starting to feel like your ribs werenât designed to hold it in.
Kara plops down beside you, folding her legs beneath her and balancing a second cupcake in her hand. âHey,â she says, bumping your shoulder. âYou and Lena are acting weird today. Everything alright?â
You freeze.
You donât mean to look at Lena again, but your eyes betray you. One glance. Just one. And sheâs already looking. Smiling softly. Eyes flicking your way like she knows youâre watching her. Like she likes that you are.
Your heart nearly breaks your ribs this time.
âShe justâŠâ you start, words catching somewhere in your throat. What are you supposed to say? That youâre broken up? That youâre lying to everyone in this room?
You settle for the only truth you can handle.
âShe looks so hot.â
Kara blinks. âWhat?â
âIâm trying to stay away so I donât jump her bones right here in front of everyone.â
Thereâs a long, horrified beat.
âOh my Rao, Y/N!â Kara nearly drops her cupcake. âEw! Justâew, okay? TMI!â
She springs up from the couch like it burned her, wiping her hands on her dress like she needs to physically scrub the mental image away.
You canât help the grin tugging at your lips. âYou asked.â
âI was expecting, like, âWe had a fight,â not graphic horny sibling confessions!â
You shrug, cheeks hot. âItâs not my fault Lena decided to wear that dress. Look at her buââ
âNOPE,â Kara groans, clutching her head like sheâs been cursed. âIâm done. Iâm going to go talk to literally anyone else.â
She storms off in mock horror, cupcake still in hand.
You shake your head, trying to laugh it off, but the heat under your skin doesnât go anywhere.
Across the room, Lena catches your eye again. She quirks an eyebrowâteasing, knowing. Like she knows exactly what just happened. Like she knows exactly what that dress is doing to you.
And thenâshe moves.
Not toward you. Not yet.
But toward the music, toward the open space where a few others are swaying lazily in pairs. She doesnât say a word. Doesnât invite anyone to join her. Just starts moving like the music is something she owns.Â
You can't believe your eyes, you can't believe she is dancing. Because Lena doesnât like dancing. At least, not usually. Sheâll do it if sheâs drunk, or if you put on music in the morning and pull her close, swaying your hips together in lazy half-steps across the kitchen floor.
But this?
This is something else entirely.
She moves like a secret meant only for youâhips swaying slow and deliberate, head tilted just enough to let her braid slide over one shoulder. Her eyes flick toward you again, dark and dangerous and amused.
You donât mean to stare. Honestly, you try not to. But your eyes betray youâagainâand when hers find yours from across the room, she winks.
Your entire face goes hot.
Kara, who somehow always appears at the exact wrong time, leans in with a low, exasperated warning: âLena, please donât do that. Sheâs already having a really hard time with that dress. Letâs try to keep it in our pants, okay?â
Lena bursts into laughter like Karaâs just delivered the punchline of the year. She turns toward her, voice sweet like honey and just as dangerous, âOh, thatâs exactly where sheâs going.â
âWhy! Why are you two doing this to me today?â Kara groans, visibly scandalized. She takes a few bold strides toward you like sheâs about to stage an intervention. âHey, horndog! Can you and your girlfriend behave? No one here wants to see you staring at each other like that.â
You try to play it cool, coy, anything to hide the panic rising in your chest. âLike what?â
âLike the world is going to end if you canât touch each other.â
And itâs⊠too accurate.
Your breath catches. Your eyebrows lift, surprisedâshockedâthat she said exactly what youâre feeling, like she cracked open your chest and peeked inside. You blink, fast, but itâs no use. The tears come anyway. Hot and heavy. Because maybe the world is ending. Maybe it already did.
âShit,â Kara mutters, instantly worried. âShit. Sorry, Y/N. I didnât mean to yell.â She softens, crouching beside you like sheâs apologizing to a child. âPlease donât cry.â
You swallow, throat burning. You have to tell her. You canât keep lying, not to her. Sheâs your sister. Sheâd understand. She'd keep your secret for tonight, you're sure.
âKara, IâI gotta tell you something.â
But before you can get the words out, Lenaâs already beside you, like she felt you slipping.
âHey,â she says, soft and steady. âIt's okay.â She glances at Kara and gives a subtle nodâdismissal or protection, you donât know which. âI got her.â
Then her eyes are back on you. Warm. Calm. Still yours in a way that wrecks you.
âCome on, honey,â she whispers, reaching for your hand. âLetâs go clean your face.â
You let her pull you to your feet.
And you donât look back.
The bathroom is warm and quiet, and thankfully far from everyone. Lena shuts the door behind you with a soft click, and you donât say anything at firstâjust grip the edges of the sink, trying to breathe.
She dampens a towel, dabs gently under your eyes, her other hand cupping the back of your neck to steady you.
âYou okay?â she asks, voice low.
âNo,â you answer. Too fast. Too honest. âBut thanks for pretending I am.â
Lena offers a faint, tired smile. âItâs what weâre both doing tonight.â
You flinch. âRight. Guess I just wasnât as good at it.â
She shrugs, still impossibly calm, like sheâs not the one who sent your entire nervous system into overdrive five minutes ago. âYou werenât supposed to be good at it. Just play the part.â
âOh, I was supposed to play the part?â You scoff. âYouâve been swaying your ass around the living room like youâre trying to win a lap dance contest.â
Lena raises an eyebrow, unbothered. âI wore a dress. I danced.â
âYou winked at me.â
âYou stared.â
You push away from the sink. âOh, come on. You did it on purpose even though we had a deal.â
âI didnât even touch you, Y/N.â
You step closer, until thereâs barely space between you. Close enough to feel her breath. Close enough to fall. âYou know you donât have to. Just admit that you wore this dress for the sole reason of driving me insane.â
She meets your gazeâunflinching, infuriating, impossible. âMaybe I did.â
And thatâs it. Thatâs the moment.
You push her back against the wallânot rough, not gentle, just enoughâand youâre kissing her before you even think it through. You kiss her like youâre furious. Like youâre starving. Like this is the last thing keeping you alive.
And when your tongue brushes against hers and you do that thingâthe one you promised you wouldnât doâLena gasps into your mouth, like it knocks something loose inside her. But she doesnât stop you. She pulls you closer.
Itâs not gentle. Itâs not careful. Itâs not pretend.
Itâs hunger. Itâs grief. Itâs home.
Itâs everything youâve been trying to bury.
She tastes like red wine and regret, and the kiss feels like confessionâhot, reckless, holy. A sin youâd commit again. A sin you'd commit forever if it always led to her.
Your hands are in her hair, her fingers are tugging at your shirt like she canât bear to let go, and for a split second it feels like time is folding in on itselfâlike this isnât borrowed or fake or ending.
When you finally pull back, breathless and trembling, her lipstick is smudged, and your heart is thundering so hard it hurts.
Lena blinks, stunned. Her lips part like she wants to say something, but the words donât come.
âI wanna rip this goddamn dress off,â you whisper, and itâs not just lustâitâs desperation. Worship. Grief.
Her breath stutters. âDonât. Donât say things like that, if you're not gonna do it.â
But her voice is barely there. Sheâs flushed and on fire, her chest rising and falling too fast, her hands still curled in your shirt like sheâs afraid to let go.
You know exactly what youâre doing to her. You also know that sheâs doing it to you, too.
You look into her eyesâreally lookâand it nearly shatters you. Her pupils are blown wide, her gaze frantic, like sheâs seconds away from coming undone. Like sheâs begging you to give in first so she wonât have to.
And for a second, you almost do.
Because why does this feel like how the world ends and how it begins, all at once?
Why does it feel so rightâso yoursâbut also borrowed and sinful, like something you were never meant to hold this long?
She nods at you slowlyâlike permission. Like a plea. Like please donât stop, please keep going, please touch me.
And you understand. You know what sheâs asking for. What you could have, right now, if you just reached for it.
But you canât. Not when she isnât yours anymore. Not when her body remembers you, but her heart already said goodbye.
You take a step back. Barely an inch, but it feels like an ocean.
âLenaâŠâ you whisper, and your voice is wrecked. âWe said we wouldnât.â
Her eyes flutter shut. She nods again, this time with her jaw clenched tight like sheâs trying not to fall apart. âI know.â
You adjust her dress carefully, smoothing the fabric where your hands had bunched it. And she lets you.
Silence settles between you, thick and awful.
You just stand there, in the eye of the storm, hands still aching from not touching her, mouth still bruised from the kiss that wasnât supposed to happen.
âIâm gonnaââ You gesture vaguely to the door, already backing away. âI just⊠I need a minute.â
You donât wait for Lena to answer. You canât.
She looks wreckedâlip bitten raw, dress rumpled, chest still rising like she hasnât found her breath yetâand you know sheâll need time to pull herself together before walking back into that living room like nothing happened.
So you do what she doesnât have time to. You flee.
You make it back into the hallway with a drink in your hand and a practiced smile that you hope doesnât look like a bruise.
Kara shows up beside you not much later, âI donât wanna know what happened in there, I just wanna make sure youâre okay.â
You force a grin, bumping her shoulder. âRelax, Kara. You didnât break my heart just because you called me a horndog.â
She gives you a look, but thereâs relief in it.
You look down at your glass, trying to shake off the way your ribs still feel like theyâre cracking open. âBy the way,â you add, voice lighter than your chest feels, âI thought you said there would be cake?â
The party winds down slowly, like the end of a dream you donât want to wake from but canât stay in, either.
Lena doesnât say much when she comes back from the bathroom. Her lipstick is fixed, her expression unreadable. You donât look at her. Not at first.
You just stand beside her when the final toast is made, you hold her hand when Eliza pulls you both in for a hug, and when Alex thanks everyone for making the night so magical, you smile like your heart isnât dragging behind you in pieces.
You donât say anything until youâre alone again, walking Lena to her door, the city silent around you like it knows whatâs coming.
âThat kissââ she starts, unlocking the door slowly. âThat wasnât fair. To either of us.â
You nod. âIt was the wine. The dress. The whole romance-in-the-air thing.â
She swallows hard. âYeah. Just... a mistake.â
âRight.â You try to believe it. Try to make it sound like you mean it.
She doesnât ask you to come in. And you donât ask if she wants you to. Just a nod. A quiet goodnight. The slow closing of a door that feels way too familiar now.
The next morning, your phone buzzes.
Youâre still half-dreaming when you reach for it, fingers fumbling across the nightstand. Your body is heavy with exhaustion, with memory. The space beside you is cold. Of course it is.
The screen lights up.
Nia Nal sent a photo.
You tap it open without thinking. And then you stop breathing.
The picture is from last nightâsoftly lit, slightly blurred, but unmistakable. It's you and Lena.
Neither of you looking at the camera. Just⊠looking at each other.
You're halfway through a laugh, your smile crooked and helpless. She's watching you with the kind of expression that makes time stutterâlike youâre the only real thing in the room. Like you're gravity itself.
And underneath it, Niaâs caption reads:
Find someone who looks at you like you're their whole world đ« #relationshipgoals
Your heart twists. Violent and sudden.
You press a hand to your chest like that might steady it, but it doesnât. Because this isn't some cute picture. This is a mirror. A gut punch. A truth youâve been too afraid to say out loud.
What are we doing? Why are we pretending we can survive this apart?
Youâre already flying before you can stop yourselfâbarefoot, breathless, wind slicing at your skin. You donât care. Youâd fly straight into the sun if it meant seeing her again.
You land on the balcony just as she reaches for the handle.
The door flies open, and there she is. Hair unbrushed. Eyes rimmed with sleep and something deeper, something unraveling.
She stares at you like she isnât sure if youâre real.
âI was coming to you,â she says, and her voice is nothingâjust breath and want.
âI know,â you whisper.
And thatâs all it takes.
You crash into each other like gravity won. Like longing built too long inside your bones and finally broke free.
Her hands are in your hair, yours on her waist, your mouths finding each other in something too fierce to be gentle, too soft to be violent. The kiss is everything you didnât say. Everything you couldnât.
You taste grief and love and every second of pretending. You kiss her like youâre trying to memorize the shape of a future you nearly gave up.
She kisses you like sheâs trying to say sorry without words. Like donât let me go again.
You pull her closer. Like you're trying to tell her that it's going to work this time. We'll make it work.
You both shake, slightly, from the weight of it.
And when you finally break for air, foreheads pressed together, hearts slamming in sync, you whisper whatâs been sitting in your chest since you saw that photo, âI look at you like youâre my whole world because you are.â
Her breath hitches.
And then sheâs kissing you againâfiercer this time. More certain. Less fear.This time, itâs not the party. Itâs not the wine. Itâs not a sin, nor a secret. Itâs real. It's yours.
















