Buffy leaves with Spike and Dawn, Willow finds out after gone.

This is irritating me because I know I should know which fic this is. Right at the very end Buffy leaves with Spike and Dawn. Willow the next morning finds out they have gone, sees footage of them leaving or something like that. I think Dawn might have stayed outside a spell or made sure she was able to reinvite Spike so they could go but I'm not sure of that.

Not much I know but the leaving part is hopefully distinct enough. Help.

No fear, found it...

Half Way to Anywhere by immram