If Sans were aware this was more than just a weird fantasy he'd probably be a little less inclined to just humour this guys questions. But right now, he's mostly just fascinated with prodding the situation to see where it goes. See what the guy says to him admitting to all the strange stuff that's been in his head.

They seem pro weird stuff. Does that make them a friend? He isn't sure.

"How do you figure?" he says, raising a skeletal brow. "To me, it mostly seems like time wizarding comes with a lot of baggage. But maybe that's just part of the mystique."