Am trying to find stories where the scoobies learn the truth about William the bloody, and just where the name really came from. It has to be an important part of the story, not just something that's mentioned in one chapter and then almost completely forgotten later. Bonus for Giles and Xander awkwardness!

West of the Moon, East of the Sun by KnifeEdge
Every night it's the same dream: a dark room, a big bed, and a silent vampire I can't see... Set in an AU Season 5 with no Glory or Dawn B/S. Rating has gone up.
(I swear, I rec that fic for everything...)

Things Present, Things Past by Estepheia
Two timelines. Two Slayers. One problem! How does Buffy get back to her own time when she's sucked into the body of a Slayer in 1880? Can another Scooby who tries to rescue her survive the past? Plus, meet William and witness Spike's decision! **COMPLETE*