Moving Day with My Best Friend's Forbidden Sister

I’m pressed against the wall of the nightclub’s back hallway, the bass thumping through the plaster like a second heartbeat, and Lila’s mouth is on mine. Her lips are fierce, hungry, tasting of cheap vodka and cranberry, her tongue darting with a sharpness that cuts through the haze of the last three hours. My hands grip her hips, fingers digging into the denim of her shorts, pulling her closer even though I know I shouldn’t. She’s my best friend Nate’s little sister—not by blood, thank God, just by circumstance, step-siblings since they were kids—but still forbidden, still a line I swore I’d never cross again. Yet here we are, moving day turning into this reckless spiral, her body arching into mine like we never stopped knowing each other.

“Goddamn, Jace,” she breathes against my jaw, her voice rough with want, a little slurred from the drinks we shared while unpacking her new apartment. “You’re still the worst idea I’ve ever had.” Her hands slide up my chest, nails scraping lightly through my T-shirt, and I can feel the smirk in her words even if I can’t see it in the dim, flickering light of this grimy corridor.

I pull back just enough to look at her, my breath ragged. Her eyes are glinting, dark and dangerous, daring me to stop. I don’t. I can’t. “Then why’re you still kissing me?” I mutter, my voice low, gravelly, as I tilt her chin up and claim her mouth again. It’s not gentle. It’s years of pent-up frustration, memories of stolen nights when we were barely out of high school, sneaking around behind Nate’s back. Her body remembers too—her hips roll against mine with a rhythm that’s too familiar, too practiced.

She laughs into the kiss, a sharp, breathy sound that slices through the noise of the club beyond us. “Because I’m stupid when I’m drunk. And you’re still hot when I’m stupid.” Her fingers twist into my hair, tugging hard enough to sting, and I groan, the sound swallowed by the pounding music. We shouldn’t be here. We should be back at her place, sorting through boxes, eating takeout, pretending the past doesn’t exist. But after hours of lifting furniture, sweating through the August heat, we ended up at this dive bar to “celebrate,” and now the past is all over us, sticky and inescapable.

I spin her around, pinning her back to the wall, my thigh sliding between hers. She gasps, a quick, sharp intake of air, and I feel the heat of her through the thin fabric of her clothes. “You’re gonna get us caught,” I warn, even as my hands roam lower, skimming the curve of her ass, pulling her tighter against me. The hallway smells of stale beer and cigarette smoke, but all I can focus on is the scent of her—sweat and something sweet, like the vanilla lotion she’s always worn.

“Let ‘em see,” she taunts, her voice dripping with defiance. Her leg hooks around my waist, drawing me in, and I’m half-lost already, the friction of her body against mine igniting something feral. But I know better. Nate’s not here—he’s working a late shift—but this town is small, and word travels fast. I pull back, chest heaving, and glare at her. “We can’t. Not here.”

Her smirk falters, just for a second, and then she’s grabbing my hand, dragging me toward the back exit. “Then come on, coward. My place is ten minutes away.” Her tone is all challenge, her stride purposeful even with the slight wobble of too many drinks. I follow because I’m weak, because the memory of her skin under my hands is louder than any sense of right or wrong.

Her new apartment is still a mess of cardboard and half-unpacked junk, the air thick with the smell of fresh paint. The moment the door slams shut behind us, she’s on me again, her fingers fumbling with the hem of my shirt as she backs me toward the couch. “You remember how this goes, don’t you?” she murmurs, her voice softer now, almost teasing, but there’s a hunger beneath it that makes my stomach twist. I do remember. Too well. The way she shudders when I touch her just right, the sounds she makes when she’s close. It’s all burned into me.

“Shut up,” I growl, yanking her shirt over her head, exposing the black lace of her bra. Her skin is flushed, a sheen of sweat from the heat of the day still lingering, and I drag my mouth down her neck, tasting the salt of her. She tilts her head back, giving me access, her breath coming in short, uneven bursts. “You always talked too much,” I add, my hands working at the button of her shorts, sliding them down her thighs until they pool at her feet.

“And you always needed pointers,” she shoots back, but her voice cracks as I drop to my knees, pulling her closer by the hips. Her underwear is damp already, and the sight of it—the evidence of how much she wants this—sends a jolt through me, sharp and undeniable. I look up at her, meeting her gaze, and there’s something raw there, something that strips away the bravado. “Show me, then,” I say, my tone daring her as much as she’s dared me. “Teach me what I forgot.”

Her lips part, a flicker of surprise crossing her face, but then she’s smirking again, one hand threading through my hair. “Pay attention, Jace. I’m not repeating myself.” Her voice is firm now, commanding, and I feel a strange thrill at letting her take the lead. She guides my head closer, and I don’t resist, pressing my mouth against the fabric of her panties, breathing her in before hooking my fingers under the waistband and tugging them down. She’s bare beneath, and the sight of her, glistening and ready, makes my throat go dry.

I start slow, dragging my tongue along her inner thigh, teasing the edge of where she wants me most. She hisses, her grip tightening in my hair. “Don’t play games,” she snaps, but there’s a tremor in her words, a plea beneath the order. I comply, flattening my tongue against her, tasting the sharp, musky heat of her arousal. Her hips jerk, a small, involuntary movement, and I grin against her skin before diving deeper, circling the sensitive bud at her center with deliberate, firm strokes.

“Fuck, yes,” she gasps, her voice breaking, and I feel her thighs tremble under my hands. I keep going, learning her again, following the cues of her body—the way her breath stutters when I suck gently, the way she pushes against me when I flick my tongue just so. She’s teaching me without words now, her reactions a map I’m eager to follow. I slide a finger inside her, then two, curling them in a rhythm that matches my mouth, and her moans grow louder, echoing off the bare walls of the apartment.

“Jace—don’t stop,” she chokes out, her voice raw, and I don’t. I can’t. I’m lost in the taste of her, the feel of her tightening around my fingers, the way her whole body seems to pulse with need. When she comes, it’s with a cry that’s almost a sob, her knees buckling as she clings to my shoulders. I hold her steady, drawing out the aftershocks with slow, gentle laps until she pushes me away, oversensitive and breathless.

I stand, wiping my mouth with the back of my hand, and she’s staring at me, chest heaving, eyes glassy. “Not bad, student,” she manages, a weak attempt at humor, but her voice is too shaky to pull it off. I chuckle, low and rough, and then I’m kissing her again, letting her taste herself on my lips. Her hands are on my belt now, fumbling in her haste, and I help her, shoving my jeans and boxers down just enough to free myself.

The couch is right behind us, still covered in plastic from the move, and I push her down onto it, the material crinkling under her weight. She laughs—a real, unexpected burst of sound—and it catches me off guard. “Romantic,” she teases, wrinkling her nose at the plastic, and for a moment, we’re just us, two idiots who’ve known each other too long, fumbling through something messy and real. I grin, shaking my head, and then I’m over her, bracing my weight on my forearms as I settle between her thighs.

“Shut up,” I mutter again, but there’s no heat in it, just a desperate need to feel her. She wraps her legs around me, pulling me closer, and I don’t hesitate, pushing into her with a single, hard thrust. She gasps, her nails digging into my back, and I still for a moment, letting her adjust, feeling the tight, slick heat of her surrounding me. It’s like coming home, a memory made flesh, and I have to grit my teeth to keep control.

“Move,” she orders, her voice sharp again, and I obey, setting a rough, steady pace. The plastic squeaks under us with every thrust, an absurd counterpoint to the sounds of our breathing, the slap of skin against skin. I angle my hips, hitting deeper, and her eyes flutter shut, her mouth falling open in a silent moan. I watch her, mesmerized, as the tension builds again, her body arching beneath me, meeting every movement with equal force.

It’s fast and messy, driven by too much history and not enough sense, but it’s perfect in its imperfection. I feel the edge approaching, a tight, burning knot in my gut, and I slow just enough to draw it out, to savor the way she clenches around me. “Lila,” I rasp, her name a warning, a question, and she nods, her eyes locking with mine.

“Do it,” she whispers, and that’s all it takes. I let go, the release sharp and overwhelming, spilling into her as she shudders beneath me, her own climax hitting in tandem. We’re a tangle of limbs and ragged breaths, the world narrowing to the heat of her body, the stickiness of sweat and sex, the faint crinkle of the plastic beneath us.

When it’s over, I collapse beside her, the couch too small for both of us, but we make it work, her head resting on my chest. The apartment is quiet now, the distant thrum of the city outside the only sound. I stroke her hair absently, feeling the weight of what we’ve done settle over me. It’s not just a mistake—it’s a pattern, a cycle we can’t seem to break.

“You’re staying, right?” she mumbles, half-asleep already, her voice soft and vulnerable in a way I haven’t heard in years. I don’t answer right away, because I know I shouldn’t. I know Nate would kill me if he found out, know this can’t go anywhere, not really. But I also know I can’t leave her tonight, not when she’s curled into me like this, trusting in a way she hasn’t been since we were kids.

“Yeah,” I finally say, my voice quiet. “I’m staying.”

What she doesn’t know—what I’ll never tell her—is that I’ve been in love with her since the first time we crossed this line, all those years ago. I’ve tried to move on, dated other people, buried it deep, but it’s always there, a quiet ache I can’t shake. As she drifts off, her breathing evening out, I stare at the ceiling, knowing I’m in too deep again, knowing I’ll probably ruin us both. But for now, in the dark of her half-unpacked apartment, I let myself pretend it’s enough.