Threads of Heat

Summer in Hyogo was suffocating. The air stuck to you like a second skin, but inside the gym it was worse—thick with shock and confusion and a kind of heat that had nothing to do with the temperature.

Atsumu Miya walked onto the court in a crop top that stopped just below his chest, a black pleated mini skirt that swished with every step, and sheer fishnets riding up to his thighs. A few leather wristbands. Winged eyeliner that made his amber eyes look sharp, almost feral. He’d dyed the tips of his hair silvery blue, and that smirk of his was turned up to max.

The rest of the team froze mid-stretch. A volleyball hit the floor, bounced once, rolled away.

“Miya… what the hell are you wearing?” Suna’s voice was flat, but his eyebrows were climbing.

“Practice clothes,” Atsumu said, twirling a ball on his finger. “Got a problem?”

Kita cleared his throat. “As long as it doesn’t interfere with drills, it’s fine. But be careful with the skirt—don’t want it catching on anything.”

Atsumu just winked. “I’ll be careful, Captain.”

Osamu stood at the far end of the court, a towel over his shoulder. He hadn’t moved since his brother made his entrance. Mouth a thin line. Jaw tight. Heat crept up the back of his neck, settled in his chest. He hated it. Hated the way his eyes followed the fishnets, the way they clung to Atsumu’s calves. The skirt swayed. The crop top rode up every time Atsumu reached for a pass—a flash of pale skin, the sharp line of his hip bone.

Osamu forced himself to look away, grabbed a water bottle, took a long drink. It didn’t help. The knot in his gut stayed.

Practice was a disaster. For Osamu, anyway. He couldn’t focus. Every time Atsumu dove, the skirt flared—black spandex underneath. When he jumped, the crop top lifted, and Osamu’s eyes snagged on the curve of his waist, the swell of his chest. Atsumu had always been lean, but lately he’d filled out in ways that made Osamu’s brain short-circuit.

“Oi, Samu, you gonna stand there ogling or are you gonna set me the ball?”

Osamu’s head snapped up. “I wasn’t ogling.”

“Sure you weren’t.” Atsumu’s grin was sharp, knowing. He tossed the ball back. “Keep your eyes on the prize, yeah?”

The rest of the team exchanged glances. Suna snorted. Kita said nothing.

By the end of practice, Osamu was wound so tight he thought he’d snap. He showered quick, avoided looking at Atsumu’s discarded clothes in the locker room, went straight home. Told himself he’d read a manga, eat some onigiri, go to bed. Normal. Routine. Safe.

But that night, his subconscious betrayed him.

---

The dream hit him like a wave. Vivid. Drowning. They were alone in the gym, lights dimmed to dusky gold, Atsumu still in that outfit. He leaned against the wall, fishnets glinting, and crooked a finger.

“Come here, Samu.”

Osamu’s feet moved on their own. He pinned Atsumu against the lockers, hands sliding up the fishnets, heat of skin through mesh. Atsumu’s breath hitched, head fell back, throat exposed. Osamu pressed his mouth there—salt, sweat. Atsumu moaned, low and broken, and it went straight to Osamu’s groin.

“Is this what you wanted?” Osamu heard himself growl. “Dressing like this, making me fucking crazy?”

Atsumu’s laugh was breathless. “Maybe. Did it work?”

Osamu answered by yanking the skirt up, pressing his thigh between Atsumu’s legs, kissing him so hard their teeth clashed. Atsumu’s hands fisted in his hair, and they moved together—desperate, clumsy, all gasps and slick heat—until—

Osamu woke with a jolt. Heart pounding. Boxers damp, skin flushed. He lay in the dark, staring at the ceiling, breath ragged. The clock read 2:47 AM.

He pressed the heels of his hands against his eyes and groaned.

Shit.

---

The next few days were torture. Slow, agonizing.

Atsumu swapped the practice outfit for his Inarizaki uniform. But those shorts? Same pair from first year, always a little tight. Now they rode up constantly, hugging his ass like it was intentional. And the jersey, loose as it was, clung to his chest when he sweated, showing off his nipples.

Osamu tried not to look. Failed.

During a break, Suna sidled up. “You know, if you’re gonna stare at your twin’s ass, you could at least be subtle about it.”

Osamu’s face went hot. “I’m not staring.”

“You’ve been staring for three days straight. It’s impressive, honestly.”

“Shut up, Suna.”

Suna shrugged. “Not my business. Just saying, everyone’s noticed. Even Kita.”

Osamu wanted to sink into the floor. He kept his eyes fixed on the ball for the rest of practice, but it was no use. His gaze kept drifting, pulled by an invisible thread. Every time Atsumu caught him looking, he’d flash a grin that was all teeth and mischief.

The breaking point came Thursday night.

Practice ran late—just the two of them, working on sets and spikes. Atsumu suggested a convenience store run. He was still in his uniform, shorts riding up as he walked. Osamu followed a few steps behind, hands shoved in his pockets, knuckles white.

The 7-Eleven was nearly empty, sterile under fluorescent lights. Atsumu grabbed a Calpis and menthol gum, leaned against the counter while Osamu paid. Atsumu’s eyes on him—steady, hot.

“You’ve been quiet all week,” Atsumu said as they stepped outside. The night air was cooler, barely. Cicadas screamed.

“Nothin’ to say.”

“Bullshit.” Atsumu fell into step beside him, close enough that their shoulders brushed. “You’ve been lookin’ at me different, Samu. I ain’t blind.”

Osamu’s stride faltered. “I dunno what you’re talkin’ about.”

“Oh, you know.” Atsumu’s voice dropped, teasing. “The way you stare at my legs in those fishnets. The way your eyes go all dark when I bend over for the ball. You think I haven’t seen?”

Osamu stopped walking. The bag of snacks swung at his side. He turned to face his twin. Streetlight caught the sharp angles of Atsumu’s face, the gloss on his lips, the challenge in his eyes.

“What do you want me to say?” Osamu’s voice came out rough, strained. “That you look good? That I can’t stop thinkin’ about—” He cut himself off, jaw clenching.

“About what?” Atsumu stepped closer. The scent of cheap body spray and sweat filled the narrow space. “Say it.”

“About touchin’ you,” Osamu snapped, the words tearing out. “About kissin’ you. About bendin’ you over the damn lockers and—fuck.” He ran a hand through his hair. “You happy now? You got what you wanted?”

Atsumu’s smile was slow, predatory. “Not yet.”

“You’re a menace.”

“I’m your twin.” Atsumu tilted his head, gaze never leaving Osamu’s. “And you’re terrified of how much you want this. Stop thinkin’. Stop fightin’ it. Just… act.”

The air crackled. Osamu’s hands trembled. He wanted to grab Atsumu, push him against the nearest wall, do all the things that had been playing on a loop in his head for days. But the weight—twins, brothers, blood—held him frozen.

Atsumu saw it. His smile softened, just a fraction. He reached out and pressed a finger to the center of Osamu’s chest, right over his racing heart.

“I’m right here, Samu. Always have been. You ain’t gonna break me.”

Osamu caught his wrist, grip tight. “You don’t know what you’re askin’ for.”

“Don’t I?” Atsumu’s voice was barely a whisper. “I know exactly what I want. The question is, are you brave enough to take it?”

---

The answer came two nights later.

It had been building. An unbearable pressure behind Osamu’s ribs. He’d barely slept. Every time he closed his eyes: Atsumu in fishnets, in skirt, in uniform, in that dream. The image burned.

They’d stayed late again, practicing serves until Kita had to kick them out. The rest of the team had already left. The gym was dark except for a single overhead light. Air smelled of sweat and rubber.

Atsumu was at the lockers, stuffing his gear into his bag. He’d changed into a loose tank top and the same mini skirt—because of course he had. Osamu watched from the doorway, breath coming in short, shallow bursts.

“You gonna stand there all night?” Atsumu asked without turning.

Osamu’s feet moved. He crossed the locker room in four long strides, and before Atsumu could react, he had him pinned against the lockers—one hand gripping his shoulder, the other braced against the cold metal.

Atsumu’s eyes went wide for half a second, then flared hot.

“Finally.”

Osamu kissed him. Rough. Desperate. All teeth and tongue and muffled groans. Atsumu’s hands fisted in his shirt, pulling him closer. Osamu’s thigh slid between his legs, pressing up into the heat. Atsumu made a sound—choked, needy—and Osamu swallowed it.

They broke apart only long enough to breathe, foreheads pressed together, ragged gasps.

“Locker room’s got cameras,” Atsumu managed, voice wrecked.

“Don’t care.”

“We should—gym mats. Darker.”

Osamu grabbed his wrist and pulled him out of the locker room, through the gym, to the storage closet where extra mats were kept. Atsumu fumbled for the light, but Osamu batted his hand away.

“No lights.”

“Fine.”

They stumbled into the small space. The door clicked shut. A sliver of light from the gym leaked under the door, just enough to see outlines. Osamu pushed Atsumu down onto a pile of folded mats. The skirt rode up, exposing fishnets and black briefs underneath.

Osamu’s mouth went dry.

“You have no idea,” he said, low and rough, “what you do to me.”

“Show me,” Atsumu whispered. No teasing now—just raw, open want.

Osamu dropped to his knees.

---

Afterward, they lay tangled on the mats. Fishnets torn in places. Skirt bunched around Atsumu’s waist. Both slick and breathless. Quiet except for the hum of the AC and a vending machine buzzing somewhere.

Osamu’s arm was wrapped around Atsumu’s waist, face buried in the crook of his neck. He could feel his brother’s heartbeat, still racing, matching his own.

“Well,” Atsumu said, voice hoarse but satisfied. “That was worth the wait.”

Osamu huffed a laugh. “Shut up.”

“Make me.”

They lay there for a long moment. Not guilt exactly. More like awe. Something fragile that might shatter if they spoke too loud.

Atsumu shifted, turned to face him. Eyes glinted in the dim light. “So. What now?”

Osamu was quiet for a beat. Then he tightened his arm, pulled Atsumu closer, pressed a kiss to his forehead.

“We keep it secret. But we don’t pretend it didn’t happen.”

“Sounds fair.” Atsumu traced a lazy pattern on Osamu’s chest. “Samu?”

“Mm?”

“I knew you’d come around.”

Osamu snorted. “You’re insufferable.”

“You love it.”

Osamu didn’t answer. He just buried his face in Atsumu’s hair, breathed in the familiar scent—sweat and shampoo and something indefinably home—and let himself have this.

The gym was quiet. The night stretched on. And for the first time in days, the knot in Osamu’s chest finally eased, unraveling into something warm and terrifying and real.