[Through his slowly simmering anger and disbelief (because, this, this is why he never wanted you to get involved in the war, this is why he'd never have gone home, honorable discharge or not, because he can't leave you alone or you'll do something spectacularly stupid like this, and he can't even dwell on the thought what would have happened if no one'd found you, what if--), he notes the returning tension, and it's obvious there's something, something big, that Steve's not telling him... but he'll trust his word and won't ask more.]
[Instead, he whistles.] A demigod? Hell, Steve, what kind of a future d'you live in? Secret agencies and heroes... that's straight out of a comic book, you gotta know that.
[The remark about Iron Man gets a snort and a shake of his head as response, though.] So something's still the same. Stark Jr.'s got the modesty from his dad, it seems.