He searches his eyes, but it’s less because he’s trying to ferret out lies and more because he’s working up the nerve to do what he means to do. He’s never been a vampire, never talked to one that he’s aware of. He doesn’t know the rules, only knows what the movies say about them. But the bloodlust seems to be universal and he knows that if that’s the case, he’s going to be tempting fate in the most dangerous of ways. But although he’s a vampire, he’s still Tony Stark, and pushing back against limitations and common sense is what he does.

Licking his lips, trying to ignore the little voice in the back of his head that asks where the saliva’s coming from, he leans forward to kiss Bruce’s throat. It’s only what Bruce has just done to him, but it’s also in some ways a test, both of himself and what he has become and of Bruce’s conviction.