Bag of Bones by Shadowlass, which I liked a lot. Great characterization of Spike. Also, the narrative got into the various POV of the characters--Anya and Giles in particular. Good stuff! Even if there was no sexay sex.
I switched to Bag of Bones because I was having trouble making out Pet's blue letters on a black background. Even when I resized everything so they were HUGE BLUE LETTERS.
Fan fic authors should have pity on those of us with middle-aged eyes.