Disclaimer: I do not own these characters or the storyline for most of this first part. Here on out it will be completely of my own writing and not that of those who put in the work to make Age of Ultron.
"Avengers time to work for a living" he flew to the core and almost everyone gathered around it, ready to tear apart any metal bot coming their way. "Romanoff. You and Banner better not be playing hide the zucchini"
"Relax, shellhead" she shouted over the comms, "not all of us can fly" she said as she ran down as many bots as possible with a massive truck. She stopped outside the building they were all in and sprinted inside. "What's the drill?"
He turned and pointed to the core, "this is the drill. If ultron gets a hand on the core, we lose." He turned to steve at his right and scanned him quickly for any injuries. He saw him being rocketed through the air onto a car, and he knew he was fine but his gut wrenched at the sight of it.
"I'm fine tony" steve said quietly, knowing full well what tony was thinking.
"Good." He answered and took his stance.
"Is that the best you can do!?" Thor shouted and ultron laughed as hundreds more of his bots came running towards them.
"You had to ask" steve sighed and gave Thor the side eye.
"This is the best i can do. This is exactly what I wanted. All of you against all of me. How can you possibly hope to stop me?"
Tony smiled, "well, like the old man said..." he turned to steve who smiled back, "together."
The hulk roared and their battle begun.It wasn't really difficult to win, as soon as Thor, tony and vision got a hold of ultron and basically melted him with all of that power, the rest of the robots ran like cowards.
"They're trying time leave the city!"
"We can't let them, not even one. Rhodey!"
"I'm on it!"
"We gotta move out. Even I can tell the air is getting thin. You guys get to the boats. I'll sweep for stragglers. Be right behind you."
"What about the core?" Clint asked.
"I'll protect it" Wanda said proudly, "it's my job" Clint nodded. After the three of them left Pietro darted through, "get the people on the boats." She demanded.
"I'm not going to leave you here." He said sternly.
"I can handle this. Come back for me when everyone else is off. Not before." He grunted. "You understand?"
He laughed, "you know, I'm 12 minutes older than you."
She chuckled. "Go."
Before Clint and nat got onto the boat, Natasha ran to the hulk to lullaby him back to banner and Clint off to a child stuck by a building.
Tony was drilling a hole through the base of the core, "steve! You on a carrier!?" He shouted through.
"Almost." He responded.
"Just, get you're ass on a boat."
"Got it."
"Thor I'm gonna need you back in that church."
"Got it" he responded.
"You know, if this works, we may not walk away" tony mumbled. He knew steve was going to be pissed after hearing that, but he wouldn't stop until everyone was safe.
"Maybe not." Thor answered.
"No, tony. Stop." Steve responded but tony ignored him. "Tony! Don't do anything stupid!"

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FanfictionSet after the battle in Sokovia. They won. Ultron was defeated. But one thing was missing, Steve. Lots of angst just like the rest of my works.