God, this was weird. It was so weird. But when Steve came barreling back into the bathroom to reassure Tony that he'd be back? Well. Tony couldn't help but smile softly. Because of course Steve would say that; would make his intentions clear. Even when he didn't have to, because Tony was practically just a stranger to him and if he felt so inclined, he could stay gone -- make a new home at Bucky's place and how would Tony ever be able to argue against that?
"Okay," he said, nodding a little, not sure how to really even respond. "Okay. That's good. You go have fun. I'll see you later."