Tony hadn't expected that, that Steve would want him to have some of it for himself, to try and make something with - which was .... kind of amazing really, you didn't need a lot of Vibranium to do incredible things with so this was a chance for something special, maybe something he hadn't been able to achieve before now. "Really?" He asked just to be sure that Steve meant it - though he knew Steve wasn't really the sort to tease, at least not about something like this.
And as for the selfish thing Steve wanted, well Tony thought maybe Steve probably deserved something just for him. So he looked with interest at the sketches that Steve had drawn out for him frowning for a moment as he took it in, it had been on the tip of his tongue to tell Steve that this was the sort of thing you could get at any hardware store and making one out of vibranium kind of seemed like a bit of a waste. But then the rest of what Steve said clicked for him.
"Oh." He said it softly with the kind of realization that this was something special, beyond special really, it was something big. Important question, Tony didn't need to ask who Steve was talking about, he knew and he had to take a moment just to let that settle on him. It was - well it was more than he was ready for of course, but old Tony? Well he wasn't an idiot, he saw the way those two looked at each other, he saw the kind of partnership they had.
"Ye-Yeah." He said after a moment nodding, "Yeah, of course, I mean, god of course he's gonna love it." Tony said shaking his head, because there was no way Tony wouldn't, it was an impossibility. "This is - this is big Steve. You really want me to do it?"