"...yeah. Yeah. Everything's fine." He'll just. Quietly have a meltdown on his own later at some point, out of sight from Zemo and hopefully Oeznik although he doesn't know how Oeznik always knows where he is at all times, when to get him, how to talk to him. Or not talk, as the case might be. He's had a couple of conversations with Oeznik already where they haven't exchanged a single word. Maybe it's no less patronising to be given a barren Christmas tree to decorate than it is to be given a colouring book but Oeznik's always looked out for him in his own way. Especially when it became apparent that Zemo wasn't going to heed his advice...

"This place smells funny." He's eager to leave once Zemo has picked out the throw. If they come across snacks on the way out, Bucky will buy some caramel popcorn or he might be drawn to the more unorthodox moose jerky. Otherwise he will just slink back to the car and not-think about this whole... marriage thing.

He's still determined to see this through between them. Whatever 'this' is. He's just maybe overthinking two or three details in the fine print.