Well, Tony really didn't look happy about fixing Bucky's arm, but he decided to not say anything about it. He figured if Stark really didn't want to do it, he wouldn't bother to. No one was really forcing him to do this, right? Whatever his reasons... he probably just had to ask a bit later.

"Alright, Stark." He was in his debt and it wasn't like he was against helping Tony in the first place. It didn't seem like a bad deal to him.

Steve stayed nearby, but he didn't take a seat. He was fine with standing up and watching over the both of them, he could do that much.