Tony liked problems that fought back.
They made noise when you hit them wrong. They sparked, smoked, broke in ways you could see. Even failure felt honest that way—loud, physical, undeniable. You didn't have to wonder whether you'd done something wrong. The thing either worked or it didn't.
People were worse.
People smiled and said everything was fine while quietly rearranging the room so you weren't in it anymore. People called it balance when what they meant was don't make this harder than it has to be.
Tony had learned that early.
What he hadn't learned—what still irritated the hell out of him—was how Harry could see all of that and still choose to be quiet.
They were in Tony's room because of course they were. Tony's room was where things happened. Wires snaked across the floor. Half a device sat gutted on the desk, its casing cracked open like it had lost an argument. The air smelled faintly of hot plastic and ambition.
"This should work," Tony muttered, flipping a switch that absolutely should not have been flipped yet.
The device made a sad whining noise and died.
"Dammit."
He glanced over his shoulder automatically.
Harry was sitting on the floor with a book he wasn't really reading, eyes flicking between the schematic on the desk and the dead machine. Tony could always tell when Harry knew something. There was a look—barely there, like a pause in the air.
"You're doing that thing," Tony said.
Harry looked up. "What thing?"
Tony gestured vaguely. "The thinking thing. The one where you already know what's wrong and you're deciding whether to tell me."
Harry hesitated. That was answer enough.
Tony rolled his eyes. "Spit it out."
"The connector's backwards," Harry said quietly. "You're forcing it to compensate instead of letting it fail."
Tony stared at the device. Then at the connector. Then back at Harry.
"…Oh."
He flipped it, rerouted the wire, tried again. The machine hummed to life, smooth and steady.
Tony grinned despite himself. "See? Easy fix."
Harry waited. He always did.
"You could've said something earlier," Tony added.
Harry shrugged. "You were figuring it out."
Tony snorted. "Faster's better."
Harry didn't argue. That was the part Tony didn't get. If someone told him he'd wasted time, he'd push back. Defend the process. Argue that breaking things was part of learning.
Harry just… absorbed it.
Tony dropped into his chair and stared at the machine, the grin fading. "You do that a lot," he said.
"Do what?"
"Wait." Tony glanced at him. "You wait until you're sure something's actually going to break before you step in."
Harry closed the book. "I don't want to interfere."
"That's the point," Tony snapped. "Interfering is how you find the edges."
Harry met his gaze, calm and infuriating. "And falling off them is how people get hurt."
There it was again. That thing Harry did—turning a technical argument into a moral one without raising his voice.
Tony leaned back and scrubbed a hand over his face. "You think I don't know that?"
"I think you accept it," Harry said.
Tony laughed once, sharp. "Yeah. Because I can fix it. Or learn from it. Or blow it up again if I have to."
Harry looked away. "Not everyone gets that choice."
That stuck.
Later, they lay on the floor staring at the ceiling, the machine humming quietly between them. Tony talked, because that was what he did. Ideas tumbled out half‑formed, overlapping, skipping steps. Harry listened, filling in gaps Tony didn't even know he was leaving.
"You ever notice," Tony said suddenly, "that teachers freak out when you talk but laugh when I do?"
Harry didn't answer right away. "You're expected to be loud."
"And you're expected to be what," Tony demanded. "Furniture?"
Harry smiled faintly. "Easy."
Tony's jaw tightened. "That's not a compliment."
"It keeps things calm."
"Yeah," Tony said. "For who?"
Harry didn't answer.
That night, after Harry left, Tony sat alone with the quiet. He hated quiet. Quiet meant things had settled without actually being solved.
He thought about the way Harry waited. The way he absorbed pressure like it was his job. The way adults leaned toward him when things got complicated and then acted surprised when he got tired.
Tony kicked the chair back and stood, restless.
Harry wasn't weak. That wasn't it.
Harry was strong in a way that let everyone else stay lazy.
And if he wasn't careful, one day something was going to break that Harry couldn't put back together quietly.
Tony didn't know how to stop that.
He just knew he didn't like the idea of a world where the only reason things stayed standing was because his brother kept holding them up without complaining.