[Muffet greets him with a friendly smile, already standing off to the side of the pool when he arrives. She gestures cheerfully at the area around them, indicating the peaceful-looking land and houses in various states of repair.]

Welcome to the islets. If you're not worried about making your way from here, I'll take my leave for now- but if you ever care to speak to me, my house is over that way.

[Honestly, the fact that it's the one with half of the roof replaced with a giant spiderweb is probably all the clue he'll need to guess which one is hers.]