Hi,
I've read this short story a while ago and can't remember the name. Angel became human and married Buffy. Spike is still vampire and white hat, does work for either counsil or Powers That Be. He visits Buffy when Angel is away and they have an affair, remeber that they sleep in the guest room not her bedroom and at one point Spike says that when he dusts Buffy should make a diamond out of his dust. It's very bittersweet but very beautiful.
Any suggestions?