"hmph." Not a surprising answer, honestly. Mettaton can never tell what's going on in that numb-skull of Sans' and he's still not sure how he knows the skeleton knows more about things than he lets on (he needs to not drink that much. It cannot be good for him), but knows an actor when he sees one. And he knows Sans is nothing if not filled with secrets.

Tired all the time, indeed, Papyrus.

But oh god, that's awful. He knew he saw sparks and smoke, but FRIED?! "of course i didn't! this is my vacation!!!" Exhausted, needy whine. "can't you... get something? if you can break into my penthouse, you can break into alphys' lab!"