It is NOT any of the ones where the two halves stay apart and they all have threesome fun, or the one where the "weaker" half ends up with Angel and the "stronger" with Spike. Hope someone can remember where it is. In any case, thanks!
p.s. To you who write chapter fics, I could really use some advice: I have a detailed outline for a huge plotty monster of an AU s/x fic, but every time I try to begin, I dead-end after a page because I get too bogged down in the details. Is there anything that helps you get past that? Never really written more than one-shots before, so I'm quite lost. D: