Steve caught his friend's eye, and grinned. They'd known one another for so long, Steve couldn't remember a time when he didn't know James Buchanan Barnes. He'd always known that if he got married, Bucky Barnes would be his best man - Bucky was the best man Steve knew.
"I could ask Tony Stark," he said, shrugging. "He'd probably buy you something ridiculous just because, or try and convince you to upgrade your arm to something that can fire cannons or shoot lasers even though that has absolutely nothing to do with a wedding. Or Banner. Banner might be better, he's a good man, and has the benefit of not being unhinged. Well, unless he gets really angry. What about Thor? He'd probably look good in a suit. But, given the whole 'god of thunder' thing, I'm not sure he could promise it wouldn't rain on the big day."
Then he laughed, and shot James a broad smile. "I'd be honored, James. I'm happy for you."