Stark – Tony – looks over at him and smiles, and there's something so sweet in that smile that Steve feels sucker-punched, feels like he can't breathe, he can't think, because who knew that Tony Stark could smile like that, open and amused and affectionate? “Yeah?” Tony says, teasing, and Natasha cuffs the back of his head.

For maybe the first time he doesn't feel oversized – or he does, but suddenly something's clicked over and it turns him on, seeing and feeling the mass and strength of his body as he pounds Tony Stark against a wall in a basement.