The Cowgirl Calculus Dilemma

The bedroom was dim, shadows pooling in corners, the only light coming from a phone screen. Posters of volleyball players and bands covered the walls, edges peeling from the humidity. Suna Rintarou sprawled on his bed, one arm behind his head, phone in the other hand, scrolling with an expression that said he was bored and proud of it.

The door creaked open.

Suna didn’t bother looking up. He knew who it was—footsteps too careful, the pause at the door too dramatic.

Miya Atsumu leaned against the frame, one hand on the wood, the other pushing blond hair out of his face. His eyes were half-closed, lips curved into a smirk that was probably supposed to be sexy but mostly looked like he was trying too hard.

“Suna,” he said, voice all low and honeyed. “I’ve been thinkin’ about this all day. You, me, this bed. I’m gonna break it tonight. We ain’t gettin’ no sleep.”

Suna finally looked up. Blinked once. Snorted. Without a word, he grabbed the pillow next to him and chucked it at Atsumu’s face.

Atsumu caught it—barely. The pillow smacked into his hands with a soft thump, and he fumbled for a second before recovering. He tossed it aside with a dramatic flick and stalked toward the bed, steps full of purpose.

“Rude,” he muttered, but the smirk was back as he climbed onto the mattress. He hovered over Suna, one knee beside his hip, the other foot still on the floor. Suna’s phone clattered onto the sheets as Atsumu leaned in, kissing him hard and fast.

Suna kissed back, hands sliding up to cup Atsumu’s jaw. The kiss deepened, messy and urgent. Atsumu broke away just long enough to swing his leg over and straddle Suna’s waist, settling his weight down. Suna’s hands drifted lower, slipping under the hem of Atsumu’s skirt—a pleated thing way too short for someone his height, but he wore it like it was armor.

“I’m thinkin’,” Atsumu murmured against Suna’s lips, fingers working at Suna’s belt buckle, “maybe I should ride cowgirl style tonight. What d’ya say?”

Suna’s hands wandered higher, brushing bare skin. “I say you’ve been watching too many videos.”

“‘S not a crime to be prepared,” Atsumu shot back, tugging at the belt.

The door swung open, slammed against the wall with a bang.

Osamu stood there, a family-sized bag of chips clutched to his chest. He froze, eyes wide, mouth hanging open. The bag crinkled as his grip tightened.

Atsumu looked up. Suna didn’t move.

Three agonizing seconds of silence.

Then the bag slipped from Osamu’s fingers, hit the floor with a soft crunch, and he threw his hands in the air. “What the hell, Atsumu?!”

Atsumu winced. Suna, calm as ever, reached for the corner of his blanket and pulled it over both of them, tucking it under his chin like nothing was happening.

Osamu pointed a trembling finger at his twin. “You— I— Wha— What are you doin'?! In Suna’s room?! On top of him?!”

“It ain’t what it looks like,” Atsumu said, voice muffled as he buried his face in Suna’s chest.

“The hell it ain’t! I got eyes! I got ears! I heard the cowgirl comment!” Osamu’s face was turning the same shade as the volleyball in their old team photo. “We’ve been out of our parents’ house for thirty hours, Atsumu! Thirty hours! And you’re already— doin' this?!”

“I’m tryin’ to have a life,” Atsumu muttered into Suna’s shirt.

“A life? You’re tryin’ to fail your exams! You’ve got three tests next week, and you’re here— here— with Suna!” Osamu’s voice cracked. He bent down, snatched the bag off the floor, and shook it. “I bought these to share! I was gonna be nice! And you repay me with— with this?”

Suna tilted his head, a faint smirk. “The chips are still good. Probably didn’t break any.”

Osamu turned his glare on Suna. “Don’t you start. You’re not innocent in this!”

“Never claimed I was,” Suna said, flat as ever.

Atsumu groaned, shifting to look up at his brother. “Look, Samu, can we talk about this later? I’m kinda busy.”

“Busy? You’re busy? I’m about to call our parents, that’s how busy I am!” Osamu pulled out his phone, brandishing it like a weapon. “I’m tellin’ them you spent your first free night in a month makin’ out with your boyfriend instead of studyin’. See how fast they cancel your allowance.”

Atsumu shot upright, nearly kneeing Suna. “You wouldn’t.”

“Try me.”

They stared each other down, that old twin rivalry flaring up. Suna lay back, arms behind his head, watching like a cat at a mouse hole.

“Fine,” Atsumu snapped, sliding off the bed. He straightened his skirt, ran a hand through his messy hair. “Fine! You win! I’ll study. Happy?”

“Ecstatic,” Osamu said dryly. He gestured toward the small desk in the corner, littered with textbooks and loose papers. “Sit. Now. I’m gonna watch you until you finish at least two chapters.”

Atsumu stomped over, dropped into the chair, and yanked open a calculus textbook with more force than necessary. He muttered something about “worst twin ever” and “kill joy.”

Osamu ignored him, turning to Suna. “And you. Keep your hands to yourself for the rest of the night.”

“I make no promises,” Suna said, reaching over the side of the bed and grabbing a single chip from the dropped bag. He crunched it.

Osamu opened his mouth to argue, then sighed. He picked up the rest of the bag and tossed it onto Suna’s desk. “Fine. Eat the chips. But if I hear one more cowgirl reference, I’m calling Mom.”

“Cowgirl,” Atsumu muttered, hunched over a derivative problem. “Cowgirl,” he repeated, louder.

“I will call her right now.”

Atsumu went silent, pen scratching across the paper. Osamu crossed his arms and leaned against the doorframe, a sentinel of sibling authority. Suna stretched out on the bed, propped on one elbow, a quiet smile on his face.

The room settled into a new rhythm: the scratch of a pen, the crunch of chips, the low hum of a phone. And somewhere in the back of Atsumu’s mind, he was already plotting his escape the moment Osamu’s guard dropped.

But for now, he scribbled numbers and cursed his brother under his breath, while Suna watched, amused, and Osamu stood guard, ready to thwart any romantic distractions.