Sideways'verse. One year after the end of Sideways, Buffy hits her head and loses her memory. And she can't make sense out of her life at all. Also, she's a bit mystified about her relationship with Spike.

Alternate reality. Buffy starts as a normal college girl. But her life is slowly turned upside down beginning with the day she’s unexpectedly in danger. Hired by chance to protect her is Spike, a vampire with a reputation for doing business with anyone for enough money. She’s less than thrilled, but finds herself drawn to him even as she realizes he’s more than he seems. But humans aren’t the only ones after her, and when she’s called as the Slayer, her whole world changes. Things with Spike, who she’s discovered some realities about, are no longer as simple as they seemed. But being sent to the Hellmouth and realizing the high death rate of her calling, Buffy hires Spike as backup with the only thing she has left—Slayer blood. Winner of 20 awards!

The rest of Spike and Buffy’s first night together. Takes place between chapters 17 and 18. Smut with a helping of plot. (If you haven’t read Sideways, this will still mostly make sense. Just know vampire Spike and human Buffy.)