"I mean, I could." He gives the thing a little shake. It, uh...buzzes a little bit, and that's a bit unnerving. Or it would be, if he hadn't seen a dozen weirder things by now.

"It might be the sorta thing that makes rainbows appear," says Sans, neutrally. "Or it could be the kinda thing that opens a black hole wherever it lands. Probably best not to take risks where gift horses are concerned."

Assumin' "gift horse" is even the right term here. Gift wyvern might be more accurate in terms of how likely it is to inflict destruction.

"Who's your buddy?" he says, inclining his skull in the direction of the little fox.