"Of course I do," Steve says - doesn't quite snap, this time, though it's admittedly a little snappish. Frustrated. Because that's the answer to both of those questions. Statements. Whatever.

He wants the serum back. And he knows what he has to do to get it.

And he hates the whole damn thing. He hates himself for wanting it. He hates himself for considering it. And yet he is. He can't not. Because, "I'm weak."

It probably comes out sounding like he means it purely physically. But he doesn't.