Five stories off the top of my head that make me happy. This will be a start, anyway.
Clem/Spike from
deborahmm A Friend in Need for first time sex ficathon on DS. Clem has a little problem with being a virgin. Can Spike help out a bud?
twilightofmagic's Wesley/Giles
Voices in the Night Giles is haunted by how he deserted his old lover Wesley before Wesley's death. Can he make contact with Wesley's restless spirit?
incasink's Honor. whore!Spike/Angel
Honor Angel is a samurai assassin. Spike is a whore, living with Ethan. Fireworks!
authoressnebula's LOST. S/X h/C dark!fic.
LostSomething happened to Xander. He's broken, branded and lost. Can Spike find out who hurt him and help Xander find himself again?
fanbot's Unbreakable. Up every Wednesday for lucky readers. S/X.
Unbreakable Xander is found a gladiator slave and rescued by Spike. Spike's gentle friendship is helping the haunted warrior heal. A very slow moving tender romance.