[Papyrus jokingly gestures at the wings to shoo, but doesn't otherwise mind the proximity. He's a little bit overheated, and his fans are running hot, and Sans has already shown a tendency to lean in towards sources of warmth these days. Probably he'll find his brother leaning against him, sooner or later... That offer, though, that's what really surprises him.]

Volunteering to reset a puzzle...? Who are you and what have you done with my brother? [There's no accusation to it, he laughs as he speaks. He isn't quite taking the offer seriously, yet.] Don't tell me, you've got some terrible pun to explain why this is different!