[He blinks in confusion at her, before growing a bit somber.

Yikes, Peter, look what you caused. Reddening a little, he says:]

I won't! I wouldn't.

[But it sounds suspiciously like a teenager who doesn't know what 'too hard' is, what limits might exactly be. It's not like he thinks he can go on forever like the little engine that could, but — he's really bad at telling how far in general is too far. Or that he's losing steam and still trying to careen down a track.

He smiles a little, placating and soft.]

It's okay, Wanda, I'll be fine. I'll make sure I get a little more sleep. And I won't let it cause any trouble for the civilians around me that I'm helping, either. Really. I'll make it work.

[He's just assuming that's the main thing, about heroing.

You gotta prioritize the safety of all the people first and foremost!]