[Aw, how sweet of her to acknowledge that he's probably just going to sit on his ass! Maybe it's a sign of the actual urgency of the matter that He doesn't take her up on it.]

A tempting offer, but I think I'll tag along this time. Your particular flair for showmanship deserves an appreciative peanut gallery.

[He'd like to know who is causing it, too...anyone capable of messing with timelines like this has always been an incredibly risky prospect. He's tentatively started to trust that Frisk is going to leave well enough alone, but if someone else is suddenly doing it...

If he had a real stomach, it would probably turn. His left eye flickers blue for a few moments, and then stops.]

...I'd hate to miss out.