1. Spike and Xander think they're lovers during Tabula Rosa episode.
2. Spike is so in love with Xander that he eventually gets a Xander-Bot (instead of a Buffy Bot)
3. Xander and Willow are the Big Bad in Sunnydale. Spike's human (William) and he's part of the Scooby Crew instead of Xander. Xander takes an interest to Spike.
I hope there's fics relating to these scenarios. Lol I keep having these flashes of material thrown to me when I least suspect it.