Tony looked uncomfortable. It was not an expression that suited him, yet it was clear on his face. It was a careful balance, promoting adoration, appearing to expect it, and yet being disturbed by it when it came. He took compliments very well, playing the flippant, enjoying the attention, but at the same time they didn't seem to absorb into him. He felt the same after hearing them as he did before.
This was somehow worse. It wasn't a compliment. It was a confirmation of faith. Somehow the sure knowledge that Steve was absolutely right didn't help. Tony wouldn't even hesitate if Steve asked him for a pint of blood. Not for a second. He would do it for Pepper, Steve, Bruce, probably even Natasha, damn her. He didn't know the man knew it. He obviously thought better of him for it, and that didn't seem right, either. Tony was not a good person. He thought that was common knowledge. He thought Steve being the best example of humanity would be too.
Thrown, Tony turned away, forgetting to answer, and he headed out the door. He would go work in his lab. There was a lot to do. He would give these people anything of himself that they wanted; but not his tech. His blood couldn't kill anybody, but the tech could, had, and did. Better to be more careful with it than himself.