Chapter Text
Ten years had a way of changing everything. People grew up, careers shifted, cities reshaped themselves around new skylines, dreams sharpened, and old wounds softened into scars that didn’t hurt until someone touched them again.
But some memories didn’t fade.
MIT’s hallways.
A prototype exploding like it was celebrating.
A dizzying spin in a lab.
A breath away from a kiss that never happened.
Graduation day—bright, loud, but somehow quiet where it mattered most.
A goodbye that didn’t sound like one, left hanging in the sterile air between you.
Tony Stark had always told himself he moved past it.
Past you.
Past that almost.
Past the sting of watching you walk away with your diploma and all the courage he couldn’t muster.
He never did.
And he learned that inconvenient truth the moment he stepped into Stark Industries’ R&D Division on a Wednesday morning that should have been perfectly unremarkable.
It wasn’t.
Because you were there.
The air outside the lab was cool, filtered with the faint hum of central air and the sterile scent of metal, solder, and faint ozone—the smell of innovation and very expensive mistakes. Tony walked at his usual brisk pace, his polished shoes clicking against the marble floor, the sound echoing between glass walls. His assistant kept up beside him, tapping through a tablet.
“Boss,” she said, efficient and clipped, “your new senior mechanical designer starts today. MIT graduate, cross-trained in energy systems, robotics, and—”
“Yeah, yeah,” Tony waved a dismissive hand. “Already read the file.”
He had not.
He never read HR files.
He skimmed them, pretended he didn’t, and fully intended to wing every interaction like he had since college.
He looked like he’d matured, at least on the outside. His suit was sharp and dark, the fabric smooth and expensive, the kind of tailoring that whispered power. The jacket framed his shoulders, the tie hung loosely in a way that looked intentional. A faint clean wood and smoke cologne clung to him, subtle but unmistakably Tony, as if confidence had a scent.
His hair was slightly shorter than it used to be, but still messy in front, still threatening to fall into his eyes. His jaw was sharper now, more defined, the shadows on his face deeper—an older, steadier version of the boy he once pretended to be.
But emotionally?
He was a complete disaster.
The frosted glass doors hissed open, releasing a faint change in lighting—bright, cool LEDs overhead mixing with the natural sunlight spilling through a high window. The lab was new: sleek metal tables, walls of holographic displays, the soft hum of machinery warming up, the crisp scent of circuitry. A few engineers murmured among themselves in the background, their voices blending with the mechanical heartbeat of the room.
Tony stepped inside first.
And froze.
Not on the outside—his expression stayed perfectly Stark: bored, mildly amused, borderline smug. But inside, he imploded.
Because you stood at the main workstation, sleeves rolled to your elbows, adjusting fine calibrations on a precision device he’d personally approved six months ago. The soft light hit your hair and made it shine differently from how it used to—styled, intentional, elegant. You carried yourself with a straighter posture, calmer movements, a quiet confidence ten years in the making.
But your eyes—
Your eyes were the same.
Sharp. Observant. Warm enough to ruin him all over again.
You looked thirty-two in the most unfairly beautiful way. Life had shaped you, softened edges in some places, carved new ones in others. You had depth now. Weight. A gravity he felt pull at him from across the room.
Tony’s heart flatlined, then kick-started so aggressively he was certain the people around him could hear it.
No. No. Absolutely not. This was fine. Totally fine. Completely—
You turned.
Your head lifted from the machine.
Your eyes met his.
You froze.
Your lips parted, breath catching in a way that echoed down his spine.
Tony panicked internally so violently he nearly tripped on nothing but oxygen. Externally, he leaned into his signature smirk, every muscle in his face performing a betrayal.
“Ah,” he said smoothly, “our new hire.”
His voice didn’t crack.
A miracle.
Inside, he was screaming into the void.
You had prepared yourself for a lot this morning—the sterile scent of new machines, the pressure of proving yourself, the buzz of whispers from the team already curious about the senior designer from MIT. You expected the cold bite of air conditioning, the gleam of metal, the hum of robotics platforms spooling up in the background.
You did not prepare for Tony Stark to walk into the lab wearing a black suit that fit him like sin, the soft overhead lights sliding over his shoulders and jaw like a spotlight.
He’d grown into his confidence. Into his intelligence. Into the physical presence of someone who no longer had to prove he was the smartest person in the room—because everyone already assumed he was.
Your heart jumped, traitorous and immediate. Ten years, and the reaction was the same—burning, sharp, impossible to ignore.
“Hello, Tony,” you said, aiming for steady.
You almost managed.
His smirk slipped a fraction. So tiny. But you’d taken classes with him. You’d worked on failing prototypes at three in the morning. You knew that micro expression like your own.
“Y/N,” he said softly, almost breathlessly. “Long time.”
“Ten years.”
He stiffened. Just a little.
He remembered the number.
Interesting.
You tried to look unaffected, but the longer you looked at him, the harder it became. He wasn’t the reckless prodigy anymore. He was composed. Grounded. More handsome in a way that suggested time had only ever planned to be kind to him.
Annoying.
Deeply annoying.
Meanwhile, Tony was losing his mind with every second you didn’t look away. He’d imagined this reunion before—in the shower, in board meetings, over coffee, anywhere his brain had a free moment to wander where it shouldn’t.
But never like this.
Never with you here in his lab.
Never looking at him like you still knew him.
“I see you’re all settled,” he managed, his voice dipping one note lower than he meant.
“Just familiarizing myself with the layout,” you said.
“Oh yes, of course,” he replied, waving vaguely at the equipment behind you. “Layout. Very… important. Classic lab thing.”
You stared at him.
He wanted to melt into the floor.
“So,” Tony tried again, reaching desperately for dignity, “HR tells me you requested placement in the advanced energy department. Ambitious.”
You frowned slightly. “I didn’t request this placement. They assigned me.”
Tony blinked. “…Really?”
“Yes.”
“Huh.”
“Is that a problem?”
“No,” Tony blurted too fast. “No problem. Zero problem. Negative problems. Problems don’t exist.”
You stared more.
He hated it.
He also loved it.
“Anyway,” he said, clearing his throat, “I hope you find everything up to your standards.”
You gave a tiny, almost teasing smile. “We’ll see.”
His entire cardiovascular system short-circuited.
He attempted to leave gracefully, which immediately failed when his foot snagged a cable on the floor. You inhaled a soft, sharp breath. His assistant stiffened beside him. Tony pretended nothing had happened.
The cable, however, judged him loudly.
“Tony?” you called gently.
He paused without turning.
“Good to see you again,” you said, voice lower now, sincerity woven between syllables.
He turned his head.
Just slightly.
Just enough.
The words hit him like a punch he never saw coming.
“…You too,” he said, barely more than a whisper.
Then he fled.
Internally panicking.
Externally trying and failing to walk like a normal human with functioning joints.
When he disappeared down the hall, you exhaled slowly, the cool air brushing your skin like a reminder that the room wasn’t supposed to feel suddenly too warm.
What were the odds?
What twist of fate placed you under him of all people?
Why here?
Why now?
Why when you’d worked so hard to move forward?
Your fingers trembled slightly as you reached for your tools again.
You weren’t over him.
Not even close.
Meanwhile, Tony made it three steps past the lab doors before bracing himself against the hallway wall. The cool surface pressed into his palm, grounding him only slightly.
“Sir?” his assistant asked. “Should I—?”
“Leave,” Tony said instantly.
She retreated like he’d detonated.
Tony dragged a shaking hand through his hair, muttering in disbelief, “Y/N's here. Y/N's actually… here.”
He inhaled sharply.
Held it.
Exhaled shakily.
“This is fine,” he told the hallway. “Totally fine. I am an adult. A mature, composed adult who does not panic over someone I haven’t seen in ten years.”
He paused.
Then whispered fiercely, “Why do they still look like that?”
An engineer walking by froze on the spot.
Tony pointed at them. “Not a word.”
The engineer vanished down the hallway at record speed.
Tony leaned back, staring at the ceiling as if it might offer instructions.
“Okay,” he whispered. “Deep breath, Stark. Deep breath. You can do this.”
He absolutely could not.