He really needs to step away. They're too close, somehow, and something really isn't right here...beyond the obvious. He has a strong feeling that Natasha is probably going to kill him for this if and when her memories return. Not that he's sure what, if anything, he's done wrong - she seems far more relaxed now than she had when she first came into the workshop - but he can't quite shake the feeling that this is going to in some way get him stabbed again.

"Yeah, but surgery's always less fun when you're awake for it," he responds lightly. But for all the easy tone he's more tense now than ever, uncomfortable with her hands on him in a way he can't even pin down. It's clearly not about the scars any more. He can't work out what it is about, but whatever it is, he's not sure he's okay with it.