[Papyrus turns at his brother's name, taking in the not-quite-familiar face and unsuitable footwear, then nods with a frown.]
Yes, yes I am! Did he bring you here too??
[It's a big accusation to fling at a guy who doesn't even seem to be here, but he knows his brother. Sure, Papyrus hasn't figured out how to get his own magic working, so there's no real reason to assume Sans has - but if Sans had, he would surely keep it secret long enough to pull one good prank with it.]
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Yes, yes I am! Did he bring you here too??
[It's a big accusation to fling at a guy who doesn't even seem to be here, but he knows his brother. Sure, Papyrus hasn't figured out how to get his own magic working, so there's no real reason to assume Sans has - but if Sans had, he would surely keep it secret long enough to pull one good prank with it.]