Buffy is resurrected, and boy howdy is she pissed.  She keeps it to herself, but watches with resentment as the scoobs have no problem shrugging the slayer duties back onto her shoulders along with Dawn's care and the financials.  After hearing from Dawn how Spike cared for her during the summer, and witnessing his continued concern for his girls' wellbeing, Buffy forms a plan.  She goes to a local worlock/wizard/witch and gets 3 matching rings, (any worn object really) that have a seriously advanced cloaking spell.  She goes to the solicitor that handled her mother's will and sets up secret accounts, transfers the rest of her meager funds and contacts a agent to sell the house and the contents.  She does all this without speaking to anyone.  Once its ready she goes to Dawn and tells her to pack one small bag, mostly with mementos she can't leave behind, like the family photo album.  Dawn is not whiney.  All she wants is to be with her sister, and trusts her completely.  She suspects whats going on and fully supports it, being mad at the Scooby's behavior herself.  She packs and follows Buffy to Spike's crypt.  Buffy asks Spike to take them away, it never once occurring to her that he could say no.  It never once occurs to him to say anything other than yes.  He gets a bag together, cleans out the Desoto and they head out.

They stop over in Las Vegas for a while.  Spike takes their seed money and manages to work his way up the ranks from a small time poker games to a huge tournament (demon friendly of course!) where he cleans up.  Meanwhile the girls are having a ball, shopping (money provided by Spike's winnings) dancing and generally having a good time.

Together they set up house and live quite happily together.  Can be anywhere, even outside the country.  Or maybe they travel for a year.  Slow build up to Spuffy.  Spike is definitely man of the house.  Buffy may chose to slay, up to author.  Scoobs finds them.  Maybe Angel asks the oracles to reveal their location.  Up to author if Spuffy returns to Sunnydale or stay where they are, but scoobs and Angel are unsuccessful in breaking them up.