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spin me right round (like a love equation)

Summary:

When a simple game of spin the bottle evolves into a crash course in probability, two rival lab partners discover their meticulously calculated friendship might be missing a critical variable. Between burnt popcorn, accidental trigonometry, and the unspoken rules of basement physics, they learn some experiments refuse to follow the scientific method.

background: rarijack, appledash, raripie, flutterdash

Notes:

๋࣭ ⭑ ⚝ hey there! another sciset fanfic alongside with other ships if you like :) but this fic is mainly about sciset so uh- please don't mind- lmao

Work Text:

The basement of Pinkie Pie’s house smelled like burnt popcorn and teenage desperation. Fairy lights drooped between exposed pipes, casting a honeyed glow over the circle of girls sitting cross-legged on the floor. At the center of their orbit sat an empty root beer bottle, its glass glinting with possibility.

“This is juvenile,” Sunset Shimmer declared, leaning back on her palms. Her leather jacket creaked in protest. “We’re seniors. Shouldn’t we be doing shots or something?”

Across the circle, Twilight Sparkle adjusted her glasses. “Statistically, spin the bottle has a 68% higher rate of—”

Rainbow Dash cut her off with a snort. “Save the nerd stats for class, Egghead. We’re here to play.” She spun the bottle hard enough to send it whirring across the concrete floor.

Sunset watched Twilight watch the bottle—how her throat moved when she swallowed, the nervous tap of her fingers against her knee. They’d been doing this dance since junior year: stolen glances in the science lab, elbows brushing while passing notes, that one time Twilight had fixed Sunset’s bike chain and left grease smudged on her cheek for hours.

The bottle slowed, landing with damning precision.

“Ooooh!” Pinkie Pie vibrated on Rarity’s shoulder. “Rarity and Applejack! Kissy kissy!

Applejack tipped her hat back with a grin. “C’mere, fashionista. Let’s give ‘em a show.”

Rarity rolled her eyes but leaned in. Their kiss was over before it began, all teeth and laughter. The girls whooped as they pulled apart, Pinkie Pie pounding the floor in approval.

“Pathetic,” Rainbow sniffed. “Where’s the passion? The flair?”

“Easy for you to say,” Rarity shot back. “Your last kiss was with a football on the field.”

The bottle spun again.

And again.

And again.

Kisses were traded like baseball cards—Rainbow Dash and Fluttershy (awkward nose bump), Pinkie and Rarity (dramatic dip that nearly toppled them both), Applejack and Rainbow (chaotic forehead bump).

Then the bottle landed where it had always been heading.

Sunset stared at the neck, pointing stubbornly at Twilight. The room’s chatter faded to white noise.

Twilight pushed her glasses up. “Oh. Um. Probability suggested this might—”

Less talking, more kissing!” Rainbow Dash crowed.

Sunset’s mouth went dry. They’d touched a hundred times—shoulders bumping in crowded hallways, hands brushing while sharing textbooks—but never like this. Never deliberate.

She crawled forward, the concrete biting her knees through her jeans. Twilight met her halfway, knees knocking together. Up close, Sunset could see the constellation of freckles across her nose, the way her pupils dilated behind her lenses.

“We don’t have to—” Twilight began.

Sunset kissed her.

It was supposed to be quick—a press of lips like all the others. But then Twilight made a small, desperate noise in the back of her throat, and Sunset’s hand found the warm slope of her neck, and suddenly they were kissing, really kissing, with teeth and tongue and twelve months of pent-up tension.

The room erupted.

Damn, Shimmer!”

“Somebody open a window!”

“I told you they were into each other!”

Sunset pulled back first, her lips slick and stinging. Twilight’s glasses sat crooked, her mouth red and slack. For once, she had nothing to say.

The bottle spun.

And spun.

And landed.

Again.

“Oh, you’ve got to be kidding me,” Sunset laughed, breathless, as the bottle pointed its accusing neck at Twilight once more.

This time, Twilight surged forward first. Her fingers tangled in Sunset’s hair, pulling just hard enough to make her gasp. The kiss turned filthy, all heat and hunger, Sunset’s back hitting the floor with a thud as Twilight climbed into her lap. Somewhere to their left, Fluttershy squeaked.

“Get a room!” Applejack yelled.

“We have rooms!” Pinkie chirped. “Eighteen upstairs! Well, seventeen now because the—”

Sunset broke away, chest heaving. Twilight’s shirt had ridden up, exposing a sliver of skin above her jeans that Sunset suddenly wanted to map with her tongue.

“Third spin’s the charm!” Rainbow Dash crowed, already reaching for the bottle.

Sunset caught Twilight’s wrist. “Run.”

They stumbled up the basement stairs in a tangle of limbs and laughter, the chants of “CHUG! CHUG! CHUG!” fading behind them. Their hands fumbling against each other’s wrists, hips, jawlines—anywhere they could find purchase. Sunset’s back hit the staircase wall as Twilight crowded into her space, their breaths mingling in the narrow dark.

Twilight—” Sunset gasped, laughter and adrenaline making her head spin.

“Shut up,” Twilight murmured, her voice low and unfamiliar, before crashing their lips together. This kiss wasn’t like the ones downstairs—no playful teasing, no audience to perform for. It was all teeth and hunger, Twilight’s fingers digging into Sunset’s hips hard enough to bruise, her hands slipped under her shirt, feeling the smooth skin of Sunset's stomach.

Sunset groaned, her head thunking against the wall. “Since when do you—ah—play dirty?”

Twilight didn’t answer. She bit down on Sunset’s lower lip instead, swallowing her gasp as she walked her backward up the stairs. Sunset tripped on the top step, catching herself on the banister, but Twilight didn’t slow—just spun her around and shoved her against the nearest bedroom door. The old wood groaned under their combined weight.

“Keys,” Twilight demanded against her neck, teeth scraping the sensitive skin below Sunset’s ear.

“My pocket,” Sunset choked out, hips jerking forward when Twilight’s knee slipped between hers.

Twilight’s hand dove into Sunset’s jeans, fingers skimming the curve of her backside before fishing out the keychain. The lock clicked. The door swung open. Sunset stumbled backward into the room, but Twilight caught her wrist and yanked her close again, kicking the door shut behind them.

Moonlight spilled through the blinds, painting stripes across Twilight’s flushed face. Her glasses were gone, lost somewhere between the basement and the staircase, and her eyes looked darker without them—wild and unfamiliar.

“You’ve been insufferable,” Twilight growled, backing Sunset against the wall beside the dresser. A framed photo of them at last year’s science fair clattered to the floor. “All those ‘accidental’ touches in the lab. ‘Oh, Twilight, can you check my calculations?’ ‘Twilight, my pen mysteriously fell under your desk—’”

Sunset’s laugh turned into a sharp gasp as Twilight pinned her wrists above her head. “You noticed, huh?”

“Noticed?” Twilight’s hips pressed forward, trapping Sunset against the wall. “You left hickies on my graphing calculator.”

“It was a love letter in permanent marker!”

Twilight kissed her silently.

This wasn’t the careful, methodical Twilight who color-coded her lab notes and triple-checked equations. This version bit and claimed and took, her hands mapping Sunset’s body like she was memorizing it for an exam. Sunset’s jacket hit the floor, followed by her shirt. Twilight’s teeth found the junction of her shoulder, sucking a bruise that would linger for days.

Twilight,” Sunset gasped, arching into the touch.

“What?” Twilight pulled back just enough to meet her gaze, lips swollen and glistening. “You started this game. Don’t tell me you’re tapping out now.”

Sunset’s knee hooked around Twilight’s thigh, flipping their positions. The wall rattled as Twilight’s back hit it. “Just making sure you’re committed to the experiment, Sparky.”

Twilight’s answering grin was feral. She fisted a hand in Sunset’s hair and dragged her close again.