This fic has been bugging me for awhile and I can't remember who wrote it or the title. What I do remember about the story. Spike and Xander go on a killing spree and Xander explains to everyone why. One line in the story has Spike telling everyone that Xander is his and Xander telling Spike he belongs to Jesse that Spike is just borrowing his body or something to that effect. If someone could help me locate it I would be grateful for it. This story shows a very dark side of Xander.