Ok, need a little help. Looking for a fic where Xan's back from Africa, been ostracized by the Scoobies, and Spike finds him. Xaner's trying to die. It turns out Xan found a watcher and slayer (in Africa) torturing little kids. Xan killed the children because they were dying and too far from help, and that's why the Scoobies cut him off. It takes Spike a while to piece together the story. I think they were somewhere in eastern US, but I'm not sure about that. Ring any bells?
Found by stinky_horowitz. Sins, by Tisienne Blue. http://www.angelfire.com/planet/tistoo/arvs/sins.html