Tony fully believes that Bruce doesn't want to leave. Or at least that he doesn't want to really leave. It's obvious that he's pulling away, trying to get space, but they've gotten close (Haven't they?); they've had a moment (sort of). And Tony isn't letting Bruce off the hook that easily. He doesn't let go. Instead, he brings his other hand around to rest on the front of the scientist's shirt, just under his heart so he can feel Tony's palm on him.

"Well, let's think about it. Just for now. Let's say there is no trouble. In theory. No one telling you what you had to do or expecting anything. What then?"

He's pushing, but he's not pushing. He's not holding Bruce there, but he's insisting. Gently testing his boundaries until the other man says no. And he hopes he doesn't say no. Tony keeps his eyes on Bruce's neck, speaking softly so he doesn't overdo the pressure.