Someone recced the fic BROWN PAPER PACKAGES by Alexandria. It's S/X and... well...the description is Xander learns a secret about Spike's past - Wackiness ensues Sexually explicit content Rated NC-17 It's a WIP, but there are 12 lovely chapters out there... and it doesn't leave off as a cliffhanger, for a change. Dunno when it was last updated. But I'm passing along the rec. Enjoy! I did. A lot.