River Song x Thirteenth Doctor x PlusâSize Black!Reader
Youâre halfway back to your room when you hear itâ
A low, ragged ohhhh that makes you freeze midâstep, socks squeaking slightly on the TARDIS floor.
Your highâhazed brain kicks in slowly:
âŚis that⌠the Doctor?
You tiptoe down the curved corridor, oversized shirt brushing your thighs. The faint weed smell still clings to you, sweet and earthy. Youâd been outside on the TARDIS steps ten minutes ago, looking at stars and trying to talk her into just one hit.
âTime Lords donât get lung damage, Doc! Câmon. Itâs relaxing!â
Sheâd laughed, cheeks pink, hands waving wildly. âI relax loads! Iâm very relaxed!â (She is never relaxed.)
But the noise againâbroken, desperateâpulls you closer. A door ahead is cracked open, golden lamplight spilling out.
You lean in, heartbeat in your ears.
âŚand immediately clap a hand over your mouth.
Inside, Riverâs curls bounce with each thrust of her hips, the shimmer of a black strap harness catching the light. Sheâs got the Doctorâyour Doctor, with that blonde hair falling in her face and her rainbow shirt rumpledâbent over a padded bench. Coat tossed aside, trousers halfway down, her thighs shaking as she claws at the bench, gasping out little halfâchoked noises.
âRiverââ 13âs voice breaks on the name, high and trembling.
âOh, you sound divine,â River purrs, hips rolling deeper, slower, drawing out another whimper. âThatâs it, love, take it. You always take me so well.â
Your knees almost buckle. You shouldnât be watching. You shouldnât. But youâre rooted to the spot, heat pooling low in your belly.
Then Riverâs head lifts. Those dangerous eyes find you instantly through the cracked door.
And her smile blooms wicked.
She doesnât stop. She tightens her grip on the Doctorâs hip, leans down close to her ear, and loud enough for you to hear murmurs,
âIf they could see you now, my darling⌠the brilliant Doctor, gasping like this while I ruin you.â
The Doctor sobs out a breath, face hidden in the crook of her arm. âRâRiverâdonâtââ
River tuts, slow and deliberate in her thrusts, and locks eyes with you again.
âTheyâve been wandering this ship in those little shorts⌠do you know how badly weâve both wanted to feel them between us? Imagine it, Doctorâimagine them right here, tasting you while Iââ She punctuates with a sharp thrust that makes 13 yelp.
You feel your entire body go molten, one hand braced on the doorframe to keep upright. Your mind is a mess of holy shit holy shit holy shit.
Riverâs grin widens. She keeps her eyes on you as she murmurs to her wife, âYouâd like that, wouldnât you? Letting them see how pretty you look when you come apart?â
The Doctor makes a sound thatâs somewhere between a sob and a laugh, legs trembling. âYâyesâ ohhh, starsââ
And you canât look away.
Not when Riverâs rhythm quickens, her voice dropping to a growl.
Not when 13âs moans turn frantic, when she shakes apart in Riverâs hands, gasping, boneless.
Youâre still pressed against the wall when River slows, soothing, brushing hair from 13âs flushed face.
âYouâre perfect, my love,â she whispers to her.
And then, just before she closes the door fully, River glances back at you. The smile she gives you is lethal. A promise.
Later, youâre sitting crossâlegged on your bed, staring at your ceiling, brain spinning so fast itâs almost funny. Your cheeks hurt from grinning. Your whole body is warm.
The door opens with a soft creak.
River slides in, curls damp now, still glowing with that postâsin radiance. She leans on the doorframe, arms crossed, lips curved.
âYou stayed longer than I thought you would,â she says, amused.
You choke. âIâ I didnât meanâ I was justââ
âOh, sweetheart.â She crosses the room, crouching in front of you. Her fingers rest lightly on your bare knee. Her voice drops low, conspiratorial. âYou know weâve been trying to flirt with you for weeks, donât you?â
Your breath hitches. âI thought⌠I mean, youâre marriedââ
âMm.â River hums, eyes glinting. âMarried, yes. Closed? Not even slightly.â Her thumb strokes over your knee, sending sparks straight through you. âAnd after tonight? Oh, darling⌠sheâs going to think about you every time she touches herself.â
Your mouth goes dry. âShe⌠knows I saw?â
Riverâs grin turns wolfish. âNot yet.â She winks. âBut Iâll tell her.â
Your jaw drops. âRiver!â
âShe deserves to know how lovely you looked standing there,â River says, standing smoothly, brushing her curls back. âBesides⌠itâll give her something to think about. Something to look forward to.â
You stare up at her, flustered and aching, as she heads back toward the door. She pauses in the doorway, glancing over her shoulder.
âWear those little shorts again tomorrow,â she says with a smirk. âAnd maybe bring that blunt of yours. Weâll convince her yet.â
The door shuts softly, and you collapse back on your bed, burying your face in your hands, giggling helplessly.