Tony never knocked.
He burst into rooms the way weather did—sudden, unapologetic, already halfway through whatever he was thinking before anyone else had a chance to prepare.
Harry learned this early. It made Tony predictable in a way that was oddly comforting.
The door to Harry's room flew open one afternoon, slamming lightly against the wall.
"Hey," Tony said. "Move."
Harry looked up from the book in his lap. "Move where?"
"My room," Tony said, as if this explained everything. "I need the desk. And your floor's cleaner."
Harry considered pointing out that Tony's room also had a desk, and that the state of the floor was a choice rather than a condition.
He closed his book instead.
"Okay."
Tony paused, just long enough to squint at him. "You're weirdly agreeable today."
Harry shrugged, already standing. "You said you needed it."
"That's not the point," Tony said. "You're supposed to argue a little. It makes it fun."
Harry didn't know how to explain that he'd been practicing not arguing. That the habit had followed him home from school and settled into his bones.
He picked up his book and stepped aside. Tony swept past him, already dragging cables and halfassembled components into the space Harry had just vacated.
For a moment, Harry watched from the doorway.
Tony sprawled across the floor, muttering to himself, pulling things apart with the kind of careless confidence that came from never worrying whether something could be put back together later.
Harry felt the familiar tug—the urge to organize, to align, to prevent the small disasters Tony left behind.
He stayed where he was.
—
Growing up with Tony meant growing up in his wake.
Teachers compared them even when they tried not to. Relatives laughed about it openly.
"One's a genius," they'd say, nodding at Tony. "The other's… very thoughtful."
Harry learned to smile at that. Thoughtful sounded harmless.
Tony didn't seem to notice the comparisons at all.
If he did, he didn't care.
Tony failed loudly and succeeded louder. He broke things, fixed others, abandoned projects halfway through and picked them up again weeks later without shame. When adults scolded him, he argued back. When they praised him, he soaked it up and moved on.
Harry watched, fascinated.
Tony never made himself smaller.
—
That evening, Tony sat crosslegged on Harry's floor, surrounded by parts, frustration etched into the set of his shoulders.
"This doesn't make sense," he said, jabbing at a schematic. "It should work."
Harry hovered nearby, pretending to read while his eyes tracked the problem automatically.
It wasn't complicated. One connection was misaligned, forcing the current to compensate elsewhere.
Harry saw it instantly.
He hesitated.
At school, he'd learned what happened when he spoke too quickly. How attention sharpened. How things tilted.
Tony wasn't school.
Still, the pause stretched.
Tony noticed.
"What?" he said, not looking up. "You're doing that thing."
Harry stiffened. "What thing?"
"That face," Tony said. "The one where you know something and you're deciding whether to tell me."
Harry's mouth opened, then closed again.
Tony looked up finally, eyes bright and curious rather than annoyed.
"Well?" he prompted.
Harry swallowed. "The connector's backwards."
Tony blinked. Then he leaned closer, frowning.
"…Huh."
He flipped the piece, reassembled it, and the device hummed to life immediately.
Tony stared at it for a second, then grinned.
"See?" he said triumphantly. "Easy fix."
Harry waited.
"You could've said something earlier," Tony added, glancing at him sideways.
Harry shrugged. "You were figuring it out."
Tony snorted. "Yeah, but faster's better."
Harry didn't answer.
Tony studied him for a moment longer, head tilted slightly, as if reassessing something he'd always taken for granted.
"You know," Tony said slowly, "you don't have to wait for permission with me."
Harry's fingers tightened around the spine of his book.
"I wasn't waiting," he said.
Tony raised an eyebrow. "You sure?"
Harry wasn't.
—
Later, they lay on the floor, staring at the ceiling while the machine whirred quietly between them.
Tony talked about his ideas—too fast, too many, skipping steps Harry mentally filled in without effort. Harry listened, asked questions when they mattered, let the rest pass.
It was easy in a way nothing else was.
With Tony, Harry didn't have to perform smallness. Tony's presence was large enough to absorb him without distortion.
That scared him, a little.
"School sucks," Tony said suddenly.
Harry turned his head. "It does?"
"Yeah," Tony said. "People are idiots."
Harry hesitated. "Not all of them."
Tony waved a hand. "Enough of them. You having trouble?"
Harry stared at the ceiling. The question was casual, but the space it opened felt dangerous.
"Not trouble," he said carefully. "Just… noise."
Tony considered that. "You could tell them to shut up."
Harry almost laughed. The idea felt absurd and liberating all at once.
"That would make things worse," he said.
Tony rolled onto his side, propping his head on one hand. "For them, maybe."
Harry met his gaze.
Tony wasn't mocking him. He wasn't challenging him either. He was just… offering a different angle.
"You don't have to be like me," Tony added, softer. "But you also don't have to disappear."
The words landed harder than Harry expected.
For a moment, he couldn't speak.
—
Down the hall, Maria watched them through the open doorway, unseen.
She didn't interrupt. She rarely did when Tony was talking and Harry was listening. She recognized the shape of that exchange—the way Harry leaned slightly toward his brother, the way Tony unconsciously made space for him without being asked.
It wasn't balance.
It was orbit.
When Harry finally stood to leave, Maria stepped back into the kitchen, pretending she'd been busy all along.
"Dinner in ten," she called.
"Got it," Tony replied automatically.
Harry paused beside her a moment later.
She glanced at him, smiling. "Good day?"
Harry thought of the classroom. The silence. The way his words had stayed trapped behind his teeth.
Then he thought of Tony, sprawled on the floor, saying faster's better without meaning louder's better.
"Yes," Harry said, surprising himself. "Better."
Maria squeezed his shoulder as he passed.
—
That night, lying in bed, Harry replayed Tony's words.
You don't have to disappear.
He didn't know how not to yet. But he understood something important now.
Being easy was one way to survive.
But it wasn't the only one.
And as long as Tony existed—loud, brilliant, unapologetically present—Harry would always have a reference point for what it looked like to take up space without asking first.
The thought didn't resolve his conflict.
It did something quieter.
It gave it direction.