The elevator to Stark Tower's penthouse played smooth jazz.
I straightened my tie, checked my reflection in the polished steel doors, and tried not to think about how this qualified as enemy territory. Tony Stark's home. Tony Stark's party. Tony Stark's carefully curated guest list of heroes and allies.
And me. The weapons dealer turned defense contractor turned... whatever I was now.
"Sir," AEGIS murmured through my hidden earpiece. "Vital signs elevated. Recommendation: deep breathing exercises."
"I'm fine."
"Your cortisol levels suggest otherwise."
"Then my cortisol levels are liars."
The doors opened onto organized chaos.
Stark Tower's penthouse was all glass and steel and money—floor-to-ceiling windows overlooking Manhattan, modern art that probably cost more than my first factory, and enough open space to land a Quinjet. Music played from hidden speakers. Caterers circulated with expensive food. And scattered throughout, the people who'd saved the world.
Tony Stark held court near the bar, gesturing animatedly while telling some story. Pepper Potts stood beside him, elegant in a blue dress, laughing at something he'd said. Steve Rogers looked uncomfortable in civilian clothes, nursing what was probably apple juice. Bruce Banner examined the skyline with the careful distance of someone managing anger. Thor towered over everyone, already drunk and cheerful. Clint Barton watched from shadows. Natasha...
Natasha stood near the windows wearing a black dress that made my brain malfunction temporarily. She caught my eye, held it for a heartbeat, then looked away like we were strangers.
Right. Public appearances. Professional distance. Nobody needed to know about whatever we were becoming.
"Hammer!" Tony's voice cut through conversations. "Fashionably late. I respect that."
I walked over, accepting a drink from a passing server. "Stark. Thanks for the invitation."
"Pepper insisted. Said excluding you would be 'politically awkward' after you saved two thousand civilians during the invasion." He studied me over his whiskey. "Also, I was curious."
"About?"
"Whether you'd actually show. Whether you'd be the same corporate snake I remember from weapons conferences, or the guy who deployed power armor and enhanced operatives to hold defensive positions while the Avengers handled the big threats."
"Turns out I can be both."
"Multitasking. I appreciate that." Tony clinked his glass against mine. "Welcome to the party. Try not to steal any corporate secrets."
"Wouldn't dream of it."
"Liar."
"Takes one to know one."
He grinned. "Oh, I like you better than expected. Come on—let me introduce you to people who might actually matter."
Steve Rogers shook my hand with the grip of someone who could crush steel.
"Mr. Hammer. Captain America." His voice was polite but cool. "I've heard about your company's work."
"All good things, I hope."
"Mixed things. Your technology helped during the invasion. But your history as a weapons manufacturer..." He trailed off diplomatically.
"Concerns you. Understandable." I met his eyes. "I can't change the past. Original Hammer Industries sold weapons to anyone with money. But I can control the present—and right now, my weapons only go to vetted clients after extensive background checks."
"That's an improvement."
"It's bare minimum ethics. But it's a start."
Steve nodded slowly. "Fair enough. Your people fought well during the battle. That counts for something."
He moved away to talk with Natasha, leaving me with Bruce Banner.
"Dr. Banner." I offered my hand carefully. "I've followed your gamma radiation research. Brilliant work, even with the... complications."
Bruce adjusted his glasses. "You mean the giant green rage monster?"
"I mean the breakthrough in gamma absorption that nobody else has replicated. The Hulk's just an unfortunate side effect."
He almost smiled. "Most people focus on the side effect."
"Most people are idiots." I sipped my drink. "I've been developing arc reactor alternatives. Different energy signatures, lower radiation profiles. If you're interested, I'd be happy to share research notes."
"Why?"
"Because you're the smartest physicist on the planet, and I'm trying to solve problems that require smarter minds than mine. Collaboration benefits everyone."
Bruce studied me carefully. "Stark said you're not what he expected."
"Is that good or bad?"
"Still deciding."
Thor appeared beside us like a friendly avalanche. "Hammer! I have heard tales of your prowess in battle! Fighting alongside mortals and holding the line while gods brought thunder! Truly worthy!"
He clapped me on the shoulder. I managed not to stagger.
"Thanks, Thor. You made quite an impression yourself."
"Yes! Lightning and glory!" He grinned. "Though I must return to Asgard soon. My brother's crimes require resolution, and the Bifrost's destruction complicates travel. But I shall return to Midgard! This realm has proven most entertaining!"
"We're glad to have you."
"And I am glad to be had! Come—let us drink to victory and fallen warriors!" He dragged me toward the bar before I could protest.
Natasha caught my eye from across the room. Her expression was carefully neutral, but I saw the concern underneath. Don't get too close. Don't reveal too much.
Message received.
Tony found me two hours later.
"Alright, enough socializing. Real talk." He gestured toward a door. "Workshop. Now."
I followed him through pristine corridors to a space that looked like organized chaos—half-finished projects scattered across workbenches, holographic displays showing armor schematics, JARVIS monitoring everything with patient efficiency.
"Welcome to where actual work happens." Tony pulled up designs. "Your Prometheus armor. Derivative but competent. Heavy assault focus instead of my aerial superiority. Interesting choice."
"Different tactical niche. You're the fast-response hero. I built for holding positions and protecting civilians."
"Which worked during the invasion. Your people held defensive lines while we handled the main threats." He zoomed in on armor details. "Arc reactor alternative using graviton particles. Clever. Less efficient than mine but easier to mass-produce."
"That was the goal. Your technology is brilliant but not scalable. I needed something fifty engineers could build instead of one genius."
"Flattery will get you everywhere." Tony pulled up another display. "Chitauri technology. What've you learned?"
"Energy weapons use exotic particles we're still analyzing. Structural materials are biomechanical composites. Their power sources generate more heat than expected—thermal management was probably limiting factor on weapon development."
"My analysis too. Think we can reverse-engineer?"
"With time. And cross-referencing our findings." I pulled up my tablet, shared files. "My metallurgy team's been breaking down armor samples. Yours?"
"JARVIS has been running simulations. Share our conclusions?"
"Sure. Professional courtesy between competitors."
Tony grinned. "I like that we're calling it competition instead of you trying to copy me."
"I stopped copying you two years ago. More profitable to innovate in different directions."
"Finally learned that lesson. Good." He sobered slightly. "You fought well during the invasion. Positioned your forces perfectly. Almost like you knew exactly where they'd be needed before portals opened."
There it was. The same question Coulson asked. The same suspicion Fury carried.
"Pattern recognition. Strategic positioning. Probability modeling."
"Bullshit." But Tony said it without heat. "I'm a genius too, Hammer. I see patterns most people miss. And your positioning was too perfect. Either you're precognitive, you had intelligence nobody else possessed, or you're the luckiest bastard alive."
"Does it matter? We won. Casualties were lower than projected. You got to play hero while I held the boring defensive positions."
"It matters if you know things that could help prevent future disasters."
I thought carefully about my next words. "Watch out for biological enhancement projects. Extremis-style regeneration serums. They tend to go catastrophically wrong when people skip safety protocols."
Tony's eyes sharpened. "Specific threat?"
"General pattern. Military contracts for enhanced soldiers usually end badly. Just... if you hear about anything like that, triple-check the science before anyone gets hurt."
"Noted." He pulled up new displays. "What else?"
"AI safety protocols. If you ever build something smarter than JARVIS, spend extra time on ethics programming. Superintelligent systems need hard limits or they start solving problems in ways humans wouldn't approve."
"You sound paranoid."
"I sound prepared. There's a difference."
Tony was quiet for a moment. Then: "JARVIS, log those warnings. Priority notation."
"Logged, sir," the AI responded.
"Thanks for the tips. Even if they sound like science fiction paranoia." Tony studied me. "You're not the joke I thought you were. You're not me—too cautious, too focused on defense instead of innovation—but you're competent. That's rare."
"High praise coming from Tony Stark."
"Don't let it go to your head." He smiled. "Now get out of my workshop. Party's still going, and Pepper will kill me if I abandon hosting duties for too long."
I found Natasha on the balcony twenty minutes later.
She stood alone, looking out at Manhattan's glittering skyline. The party noise was muted out here, replaced by wind and distant traffic.
"Hey," I said quietly.
"Hey." She didn't turn. "You survived the gauntlet."
"Steve's suspicious but polite. Bruce is cautiously interested. Thor thinks I'm worthy. Clint's probably running background checks as we speak."
"He is. I helped him compile the file."
"Should I be worried?"
"Depends what you're hiding."
"Everything."
She almost smiled. "At least you're honest about being dishonest."
We stood together in comfortable silence. Below, the city sprawled—still scarred from invasion but rebuilding fast. Always rebuilding. That's what humans did—survived despite everything trying to end them.
"Tony respects you now," Natasha said eventually. "That's dangerous."
"How so?"
"Because respect means attention. Attention means scrutiny. And you can't afford scrutiny when you're hiding whatever future knowledge you possess."
"I'm careful."
"You're reckless with a veneer of planning." She turned to face me. "Planting seeds about Extremis and AI safety with Stark? That's not subtle."
"It's necessary. If he ignores the warnings and disasters happen anyway, at least I tried. If he listens and prevents them, even better."
"And if he realizes you know too much?"
"Then I deal with that when it happens."
Natasha shook her head. "You're going to get yourself killed."
"Probably. But not tonight." I moved closer, careful to maintain professional distance where cameras might see. "How are you? After Loki, after everything?"
"Managing. Therapy helps. So does work." Her voice was steady. "And knowing someone sees me as more than just an asset."
"Always."
"Complications noted," she said softly. "Proceed cautiously."
"That's my line."
"I'm stealing it."
We stayed on the balcony until the party wound down, two people carrying too many secrets, watching a city that refused to quit.
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