The Worst (and Best) Non-Date But Kind of Date Ever

Fray, Erin, and Harth come back from the future to warn the Scoobies of an upcoming apocalypse. They're not sure they much believe that Harth can be trusted, though. Dawn agrees to babysit Harth while pretty much everyone else goes to get the ingredients needed for a spell that proves that he has a soul. And while they talk about fate and themselves, they fall for each other. AU.