Tony wouldn't want Bucky's loyalty to ever stray from Steve -- everyone needed a best friend like that, after all. Tony had --well. Tony had had Rhodey back home, and he was pretty sure that if he needed that now, Nebula might be the first place he might look. It was good. To have someone who always had your back even when you were being an absolute asshat. Which Steve did have the tendency do to. Tony loved him because of and despite that, mind.
"It does make sense," Tony said, leaning back in his chair and planting his feet against the floor solidly in order to twist the chair back and forth, fidgety but not in a nervous way, just in a too much energy sort of way. "The first one was built to be a weapon, the prosthetic aspect of it was secondary at best. This one --" he gestured to the arm, "this one was built with the intent to help. That it's stupidly sturdy is more an added benefit. It's good work, honestly. Shuri's clever." She might have been as clever as Tony but for the fact that he had years of experience and emotional not-interested-in-internet-memes maturity on her.
"That's what a good build ought to do," he went on, because --yeah. That's what his suit was like. More of him, not just something he wore. "Anyway," he said, leaning forward again and gesturing a little vaguely for Bucky to spin around a little to make his arm more accessible. "Lose the shirt, huh?"