___ The space heater in Nobara’s dorm dies in the middle of a freezing night, so she barges into Yuji’s room and claims his kotatsu – when the whole building loses power, they’re left in the dark under one blanket, shoulder to shoulder, trying not to freeze while a movie plays on his phone until the tension between them finally snaps and the bickering turns into something else.
___ The cold hit Nobara like a curse technique she couldn’t exorcise.
She stood in the doorway of Yuji’s room, arms crossed, teeth chattering hard enough to click.
Her own room was a block of ice.
The space heater had given up an hour ago, wheezing its last and plunging her into a darkness that felt personal.
“Your heater works?” she asked, already pushing past him.
Yuji blinked.
“Uh, yeah?
But—” “Good.
I’m staying.” She dropped onto the floor, shoving aside a manga stack.
The kotatsu sat in the middle of his room, its orange blanket pooling like a promise.
The heater hummed warm against her legs.
She didn’t ask permission.
She didn’t need to.
Yuji scratched the back of his head.
“You could’ve just asked, y’know.” “I just did.
Idiot.” He laughed—that easy, dumb laugh—and slid onto the other side of the kotatsu.
His knees brushed hers under the blanket.
She didn’t pull away.
The room was small.
Posters of action movies overlapped on the walls.
A half-eaten bag of chips lay open on his desk.
The heater clicked every few seconds, a tiny metronome counting the quiet.
“So,” he said, “what broke your heater?” “It didn’t break.
It died.
There’s a difference.” “Right.
And you’re here to steal my warmth.” “I’m here because you’re the only person in this dorm who remembers to pay the electric bill.” He grinned.
“That’s not true.
Gojo-sensei pays it.” “Gojo-sensei forgets.
I’ve seen the late notices.” Their voices settled into the familiar rhythm of argument that was never really an argument.
She complained about the draft in her room.
He offered her his hoodie.
She rolled her eyes but said yes.
The hoodie swallowed her.
It smelled like him—laundry detergent and something warm, maybe curry.
She tugged the sleeves over her hands and buried her nose in the collar.
“You look small in that,” he said.
“Shut up.” But she didn’t take it off.
The power died at nine-thirty.
No flicker.
No warning.
One moment the heater hummed, the next the room dropped into silence and deep cold.
The lights didn’t even sputter—they just went dark.
“What the hell?” Yuji’s voice came from the black.
Nobara’s phone screen lit up her face.
“Power’s out.
Probably the whole dorm.” “Great.
Just great.” Silence.
The heater had been keeping the room barely warm.
Now the cold crept in like a slow tide.
Nobara tucked her legs under the kotatsu blanket, pulling it tighter around her shoulders.
“Move closer,” she said.
“What?” “The blanket’s small.
If we sit apart, we both freeze.
Come here, dummy.” She heard him shuffle across the floor.
His warmth found her before his body did—a solid presence settling beside her, shoulder to shoulder.
He smelled more strongly now, that same clean scent.
They sat in the dark.
“This is kinda nice,” he said after a minute.
“What, freezing to death?” “No.
Just… sitting.
In the quiet.” She didn’t answer.
Her hand lay on the blanket between them.
His was close enough that she could feel the heat radiating off his knuckles.
The silence stretched.
“We should watch a movie,” he said.
“On my phone.” “The battery will die.” “So?
We’ll fall asleep anyway.” She snorted.
“What movie?” “I dunno.
Something dumb.
Die Hard?” “It’s not even Christmas.” “It’s always Christmas if you believe in Bruce Willis.” She laughed.
She didn’t mean to.
It came out sharp and surprised, and she felt his grin in the dark.
“Fine.
But you’re paying for the snacks next time.” “Deal.” He pulled out his phone, propped it against a stack of books, and pressed play.
The screen cast weak blue light across his face.
She watched his profile instead of the movie—the curve of his jaw, the way his brow furrowed at action scenes.
The heater stayed dead.
The cold pressed in.
At some point, she shifted closer.
Her thigh pressed against his.
He didn’t move away.
Neither did she.
The movie played on.
Explosions.
One-liners.
She wasn’t following the plot.
Her focus had narrowed to the point of contact between them—the line where his sleeve brushed her wrist, the warm exhalation of his breath.
“You’re not watching,” he said.
“Neither are you.” He turned his head.
Their faces were inches apart.
The phone screen glowed between them, catching the flecks of gold in his eyes.
“Then what are we doing?” he asked.
She didn’t answer with words.
Her hand shot out and grabbed the front of his shirt—the fabric bunched in her fist—and she yanked him forward.
Her mouth found his.
Hard.
Off-center at first, then corrected with a small shift.
He made a sound.
Surprise, maybe.
Then his hand came up to cradle her jaw, thumb brushing her cheek, and he kissed her back.
The phone fell.
The movie kept playing, muffled against the floor.
She broke the kiss to breathe.
“You’re not dense enough to miss that, right?” His laugh was breathless.
“I got it.
I got it.” “Good.” She kissed him again.
Slower this time.
Her fingers slid into his hair—shorter than hers, but soft—and she tugged gently.
He made a low noise in his throat, and she felt it vibrate through her own mouth.
They broke apart gasping, foreheads pressed together.
“Are you sure?” he asked.
His voice was rough.
His hand was still on her face, thumb tracing a line along her cheekbone.
She answered by pulling the hoodie over her head.
The air hit her skin, cold and sharp.
Then she grabbed his hand and guided it under the blanket.
His fingers found her waist.
Warm.
Calloused.
“Yeah,” she said.
“I’m sure.
Don’t make me wait, Itadori.” He moved.
The kotatsu blanket became their world.
The cold receded, replaced by heat that came from the inside.
His hands explored her—hesitant at first, then bolder as she arched into his touch.
She worked at the buttons of his flannel, pushing it off his shoulders.
Skin to skin, the cold didn’t stand a chance.
Her breath hitched when his mouth found her collarbone.
She dug her nails into his back, and he hissed against her skin.
“You’re so warm,” he murmured.
“You’re so talkative.” He laughed again, but it turned into a groan as her hand slid lower.
The blanket rustled.
The floor was hard beneath them, but she didn’t care.
She guided him, spoke with her body, and he followed—earnest, desperate, beautiful in his focus.
When he entered her, she gasped and bit down on his shoulder to muffle the sound.
He froze, waiting.
She nodded, and he moved.
The rhythm built slowly.
The kotatsu creaked.
Her legs wrapped around his waist, pulling him deeper.
He buried his face in her neck, breathing hard, and she clung to him like he was the only source of heat left in the world.
Which he was.
Time blurred.
Sensation sharpened.
She lost track of the movie, of the cold, of anything except the weight of him, the sound of their breath mingling, the way his hand found hers under the blanket and interlaced their fingers.
The climax came not like a wave—she hated that metaphor—but like a held breath suddenly released.
Her body tensed, then shattered.
She heard herself make a sound she’d never made before, and he followed a moment later, his grip on her hand tightening until it almost hurt.
Then stillness.
The room held its breath.
They lay tangled under the kotatsu, limbs heavy, skin damp.
The phone screen had gone dark, battery dead.
The cold was creeping back at the edges, but she didn’t feel it.
His hand was still in hers.
“Hey,” he whispered.
“Mm.” “That was… I mean, I didn’t…” “Shut up.” He snorted, but his arm tightened around her.
She nestled into the curve of his shoulder, her cheek against his chest, listening to his heartbeat slow.
The heater was still broken.
She didn’t care.
Her eyes closed.
His fingers traced lazy patterns on her back.
She was already half-asleep when she felt him press a kiss to the top of her head.
“Night, Nobara.” She didn’t answer.
She didn’t need to.
The cold had nothing on the warmth of his body pressed against hers, and she let herself drift off, tangled in his arms, knowing that tomorrow would come with explanations and teasing and probably a lot of blushing from him.
But tonight— His breath evened out.
His hand went slack.
She smiled into the dark and fell asleep.