He does the same to Bruce now, hesitant in a way he'd never be if Bruce were awake, more afraid of himself and his ability to break everything he touches in ways Bruce can't even comprehend than he is of Bruce or the Hulk or even the possible weirdness of getting caught watching Bruce sleep.

Ahhhhhhhhhh, TONY. My heart.

(also, Tony's tumblr would be the best thing in existence - all robots and embarrassing candids of other Avengers and occasionally rants about Hammer Tech and/or smackdowns of people and reblogs of Steve and Thor's hilarious attempts at PR)