He's only able to come after she does, as if he had to see her face, take his own pleasure in thinking he had anything to do with Natasha's, thinking he had pleased her, just to get off fully.

As if this was all he was existing for. There's a part of Bucky deeply disturbed by that, but later, he'll understand it was the club. Later, when he inspects it more logically. Right now, his erection slowly goes down, and his body isn't as painfully warm.

He still tries to hold onto her, at least until she's ready to leave. As long as Natasha wants to stay, though, he's willing. The room seems to still be theirs.