So here's the one part I can remember-
Xander had (I believe) been kidnapped or taken by Spike and Spike had one of his minions take Xander to the bathroom and "clean" him, aka, enema. Xander insists that he's really very clean but it all happens anyway. When Xander gets taken back to Spike, Spike asks how it all went and the minion tells him something like "as well as can be expected for the first time." Anyone who could find this fic would be my hero! And any other kidnapped!Xander fics would be welcomed as well.
Tons of thanks for any help!