The tower falls in a clatter of wooden blocks, and Bucky laughs and keeps laughing, and she laughs too, her heart feeling so full it ought to burst any second.

It doesn't, though, just keeps growing, filling her chest and head with warmth and delight. Steve's got his hands up, grinning too. "It wasn't me," he protests, and laughs. "Does that mean I win?"

"Yeah," she tells him. "But now you go against me. Better bring your A-game, Rogers."