Soft Changes

The Miya house runs on a rhythm—early-morning fights over the last onigiri, their mom sighing soft and tired before they even get loud. But this morning, something’s off. Atsumu wakes up before his alarm with a dull ache in his chest, like he slept on a rock. He rolls onto his back and it sharpens—tender, swollen, makes him suck in air.

He sits up, tugs at his sleep shirt collar. Tighter than usual. Frowning, he shuffles to the bathroom, half-asleep, and stops in front of the mirror. His reflection stares back, grumpy and sleep-tousled. But something’s different. Under his thin T-shirt, his chest has changed—soft, round where there was nothing before. He pokes at it experimentally. Winces.

"The hell?" he mutters, pressing both palms flat over the lumps. They feel like bruises that haven't formed yet.

He doesn't want to think about it. He yanks on a looser shirt, hopes the extra fabric hides whatever's happening. It doesn't. He thumps down the stairs. Osamu's already in the kitchen, leaning against the counter with a cup of tea, those sharp eyes catching everything.

"You're walkin' weird," Osamu says. Not a question. "An' your shirt's all bunched up."

"Shut up," Atsumu snaps, grabbing a rice ball from the plate their mom left out.

Osamu's gaze flickers to Atsumu's chest, then away. A faint smirk. "Did you grow boobs or somethin'?"

Atsumu's face flushes hot. "Shut your mouth, Osamu!"

Their mom appears from the pantry, wiping her hands on her apron. She takes one look at Atsumu—the hunched shoulders, the way he keeps trying to cross his arms without touching his chest—and her expression softens with immediate understanding. She steps between them, voice calm but firm.

"Osamu, that's enough. Eat your breakfast."

Osamu raises an eyebrow but doesn't argue. Their mom has this superpower she honed over seventeen years of twin tornadoes: shutting down a fight without raising her voice. Atsumu still glares at Osamu, but his shoulders sag when she turns to him and says quietly, "Come see me after you've eaten. We'll talk."

He doesn't want to talk. He wants to pretend it isn't happening. But he nods, shoves the rice ball into his mouth so he won't have to answer.

---

Six months later, the universe decides the chest thing was just a preview. Atsumu wakes up with a cramp in his lower abdomen like a tiny demon using his insides as a punching bag. He stumbles to the bathroom, groggy, irritable, and finds blood. Not from a cut. Blood coming from somewhere it never came from before.

He freezes. Panic claws up his throat. He's a seventeen-year-old boy—or, well, he thought he was a boy. Just a boy with some weird hormone imbalance that gave him mild gynecomastia. His mom explained it, offered to take him to a doctor, but he was too embarrassed. She bought him a compression vest. He wore it under his volleyball jersey. Things settled into an awkward normal.

But this? Not normal.

"Mom?" His voice cracks. He cracks.

She finds him sitting on the edge of the bathtub, shaking. She kneels in front of him, hands cool and steady on his knees. "It's okay, Atsumu. It's going to be okay."

She explains it simply, gently. His body developed female reproductive organs internally—ovaries, a uterus. The chest growth is breast tissue. The bleeding is a menstrual period. He's intersex. That's a big word, she says, but it doesn't change who he is. Just means his body's a little different, and they'll figure out how to handle it together.

She hands him a pad, shows him how to use it. He feels like he's moving through water, everything muffled and distant. He wants to scream. He wants to disappear.

Osamu's waiting outside the bathroom door when he finally comes out. He heard some of it—the muffled conversation, their mom's soft voice—and his smirk is gone, replaced by something careful and uncertain. He doesn't say anything. Just looks at Atsumu, then the floor, then back.

"You okay?" he asks, voice low.

Atsumu's first instinct is to lash out. No, I'm not okay, I'm bleeding from somewhere I shouldn't be, I'm a freak—but the words lodge in his throat. He just shakes his head once, and Osamu nods.

That afternoon, when Atsumu curls up on the couch with a hot water bottle, Osamu comes back from the convenience store with a bag of chocolate. Not a bar. A whole bag of individually wrapped pieces, the kind Atsumu likes. He dumps them on the coffee table without a word.

"What's this for?" Atsumu mutters.

Osamu shrugs. "Don't know. Thought you might want it."

He doesn't say anything about the bleeding. Doesn't ask questions. Just brings chocolate every day for the next week. It becomes their unspoken ritual. Atsumu never thanks him, but he always eats the chocolate. And Osamu never stops bringing it.

---

Present day. The living room's a battlefield, and the remote's the prize.

"I was watchin' that!" Atsumu yells, diving across the couch to snatch the remote from Osamu's hand. Osamu holds it high, his longer arms giving him an unfair advantage.

"You were watchin' a commercial," Osamu says flatly. "I'm changin' it."

"Don't you dare! The match is about to start!"

"It's a replay, you already saw it."

"I don't care! Gimme!"

Suna Rintarou sits in the armchair, scrolling through his phone with the detached air of someone who long ago stopped intervening in Miya twin squabbles. He glances up once, then back down. "You two are unbearable."

"Stay out of it, Suna," they say in unison.

The remote dangles from Osamu's fingertips as he leans back, smug. Atsumu growls. He's shorter by a centimeter, but faster, more agile. He can win this. He launches off the couch, plants one knee beside Osamu's thigh, and reaches up, fingers brushing the plastic.

Osamu leans further back, tilting the remote away. "Not even close."

"You—!" Atsumu scrambles, climbs onto Osamu's lap for better leverage, his weight pressing down. Osamu grunts but doesn't push him off. They're used to this kind of tussle. Atsumu grabs Osamu's wrist, pries his fingers open, and finally snatches the remote with a triumphant crow.

"Ha! Who's the loser now?"

Suna looks up again, deadpan. "You're literally sitting on him."

Atsumu grins, victorious, and starts to climb off. But as he shifts, he feels a strange, wet sensation against his inner thigh. His grin falters. He freezes, still half-sprawled across Osamu's lap.

Osamu's smirk fades too. He feels it—the dampness seeping through his joggers. He looks down. A dark, spreading stain blooms across the light gray fabric where Atsumu was sitting.

Atsumu's face goes white. Then red. "Oh no. Oh no, no, no—"

He scrambles off so fast he nearly falls, landing on the floor with a thud. Suna raises an eyebrow but says nothing, gaze flicking between them. Atsumu presses his hands over his own pants, feels the telltale warmth. He bled through. He bled through on Osamu's lap, in front of Suna, in front of—

"I'm sorry," he chokes out, voice cracking. "I'm—I didn't think—it shouldn't have been this heavy today, I took my meds, I swear I—"

"Hey." Osamu's voice cuts through the ramble, calm and steady. He stands up, looks at the stain on his joggers, then at Atsumu. "It's fine. It's just blood. I'll change."

But Atsumu's still apologizing, embarrassment burning in his eyes. Suna quietly excuses himself to the kitchen, giving them space.

Osamu walks past Atsumu toward the stairs, then stops. He turns back, expression shifting from casual to sharper. "How much did you bleed through?"

Atsumu blinks. "What?"

"You said it shouldn't be this heavy. How heavy is it?"

Atsumu opens his mouth, closes it. The truth is he's been bleeding heavily for three days—heavier than usual, cramps that have him doubling over during practice. He hid it, as always, wore dark shorts, took extra painkillers. But the look on Osamu's face tells him hiding isn't going to work anymore.

"It's fine," Atsumu says weakly.

"It's not fine." Osamu's voice is quiet, but there's an edge. "You're bleedin' through pads in, what, an hour? That's not normal, Atsumu."

"How do you know how long I—?"

"I notice things." Osamu crosses his arms. "You've been pale for a week. You skipped dinner twice. You keep takin' ibuprofen like it's candy. Don't think I don't see it."

Atsumu's throat tightens. He looks away, at the floor, at the stain on the rug he'll have to scrub later. "It's nothin'."

"Bullshit." Osamu steps closer, voice dropping. "You need to see a doctor. A real doctor, not just the sports clinic."

"I'm fine."

"You're not, and you know it. So stop bein' stubborn and let me help."

The words hang in the air. Atsumu's eyes burn, but he refuses to cry. He spent the past year and a half pretending everything's normal, pretending his body isn't a constant, painful surprise. He thought he could handle it alone. But Osamu—annoying, teasing, twin Osamu—is looking at him with something that makes his chest ache even more than the cramps.

"Fine," Atsumu whispers. "Fine. I'll go."

---

The doctor's office smells like antiseptic and paper. Atsumu sits on the examination table, legs dangling, while Osamu leans against the wall, arms crossed. He insisted on coming, and Atsumu was too tired to argue.

Diagnosis comes after an ultrasound, after blood tests, after a long, careful conversation about symptoms. Endometriosis. The tissue that's supposed to line the uterus is growing outside it, causing chronic pain, heavy bleeding, cramps like a knife twisting. Explains everything—the breakthrough bleeding, the debilitating pain, the fatigue dragging him down for months.

The doctor is kind. She explains treatment options: hormonal therapy, pain management, maybe surgery down the line. She emphasizes it's manageable, he's not alone, many people with endometriosis live full, active lives.

Atsumu nods through it all, hands clenched in his lap. He feels hollow. The word endometriosis is another label he didn't ask for, another way his body betrayed him.

Osamu doesn't say much during the consultation. Just listens, jaw tight. When they leave, walking through quiet evening streets, he finally speaks.

"Okay. So. What do you need?"

Atsumu laughs, brittle. "I don't know. A new body?"

"Can't help you with that." Osamu shoves his hands in his pockets. "But I can make sure you eat proper meals and take your meds and stop bein' a dumbass who tries to practice through the pain."

"I'm not a dumbass."

"You literally collapsed in the locker room last month. I had to carry you to the nurse."

"That was one time."

"It was three times."

Atsumu falls silent. They walk a few more steps, streetlights flickering on. Then Osamu bumps his shoulder against Atsumu's—light, familiar.

"You're stuck with me, you know," Osamu says, voice low. "We're twins. That means I get to annoy you forever. But it also means I'm not lettin' you go through this alone."

Atsumu's throat tightens again. He stares straight ahead, blinks rapidly. "You're gonna be so annoying about this. Bringin' me tea and remindin' me to take my pills like some kinda nursemaid."

"Shut up. I'll be the best nursemaid you've ever had."

"I hate you."

"Love you too."

They walk the rest of the way home in comfortable silence. When they get there, Suna's already on the couch, eating chips and watching TV. He looks up as they enter.

"Well?" he asks.

"Endometriosis," Atsumu says flatly.

Suna nods, like that makes sense. "My cousin has that. She says heat packs and chocolate help."

Osamu snorts. "See? Even Suna knows."

Atsumu throws a pillow at him. Osamu catches it, grinning, and tosses it back. For a moment, the tension breaks, and it's just them again—two idiots throwing pillows, with Suna rolling his eyes in the background.

Later that night, after Suna's gone home and their mom brought them a late dinner, Atsumu sits on the couch with a heating pad pressed to his stomach. Osamu sits beside him, scrolling through his phone. TV's playing some random drama neither of them is watching.

"Hey, Osamu."

"Mm?"

Atsumu hesitates. "Thanks. For, uh… for makin' me go. And for not bein' weird about it."

Osamu doesn't look up from his phone. "You'd do the same for me."

"Of course I would. I'm the better twin."

"Sure you are."

Atsumu elbows him. Osamu elbows back. But when Atsumu leans his head against Osamu's shoulder, Osamu doesn't push him away. Just lets him stay there, warm and solid, a steady presence in a body that's never quite felt like home.

And maybe that's enough. Maybe they don't need to fix everything. Maybe they just need to face it together—with bad TV, stolen remotes, and the quiet understanding that no matter what, they have each other.

The chocolate on the coffee table is from Osamu. Atsumu reaches out and grabs a piece, unwraps it slowly. Dark, his favorite. He pops it into his mouth, lets the sweetness melt away the last of the day's bitterness.

"You're not so bad," Atsumu mumbles around the chocolate.

"Don't get sappy."

"I'm not gettin' sappy. I'm statin' a fact."

Osamu's lips twitch. He doesn't say anything, but he doesn't have to. The silence is comfortable, full of years of shared history and the unspoken promise that they'll keep sharing it.

Atsumu closes his eyes, feeling the heat from the pad seeping into his cramped muscles. It hurts. It'll probably always hurt, at least sometimes. But for the first time in a long while, he doesn't feel like he's carrying it alone.

And that makes all the difference.