Oh, don't underestimate how much Bruce wants to escape. He feels -- not trapped, but the bubble of personal space he's used to having, to carefully crafting both for his sake and for everyone else's, is nonexistent, and he feels the pressure of Tony pushing in on him. It isn't wholly unpleasant, which is of course, the problem. He isn't doing it on purpose, but he's leaning away from Tony, back into the seat cushions, trying to regain some space.

The hard part about this is that Bruce wants to believe Tony. Why wouldn't he want to believe him? Why wouldn't he want to stop living like he is a time bomb? Why wouldn't he want... Tony? Not that he thinks that's what Tony's offering, but it's not like he's sure of that, either.

He shakes his head, dropping his eyes to the side, away from Tony. "It... happens to other people. Generally I don't think about it. Just saves trouble, in the long run."