[He nods at both of them, encouragingly. If he ignores the weirdness of talking to himself... well, it's really no different from talking to any child, is it? So he might as well treat it that way, until he could wrap his mind around this whole thing.

And he's not surprised Frisk knows about this. Chibi must have told them, of course.]

That's right, I'm a mushi-shi. Or... I was. It wasn't a bad life, really. I got to travel around and see some really amazing things, and also help a lot of people, after all.

[But it's a life he never wants to go back to, if he can help it.]