Season 6: Xander loses his two best friends when Warren's bullet hits Buffy and then Willow, killing them both and leaving Tara in a coma. Xander is being held captive by Warren, Andrew and a newly joined (and vengeful) Anya.
Post Series: Xander is shacked up in the Hyperion along with the other Sunnydalers and is currently planning lessons for incoming Slayers. But a sudden phone call has just dubbed him Watcher of Cordy's cousin Nikki.
Season 3: AU right from the start, Xander tracks Buffy down in L.A. and stays by her side as she works through her feelings. In the midst of all of it...Buffy and Xander get closer and actually begin to fall in love while Buffy tries to avoid her Slayer duties but somehow they keep coming at her.
Season 6: Spun from an AU community, Warren and Xander confront their realfeelings about each other...one of Xander's being rage and Warren's being regret. But when a weird moment causes Xander to question himself awkwardness reigns as they try to decide to do anything about it.