This is terrific! I don't think this will ever be my favorite pairing, but you really made me see the attraction it holds for others... and I can assure you that's not an easy task! I mean yes, I could always see the chemistry there in the fourth season (you left out my favorite moment there, by the way. Giles tells Spike that his new crypt could use a woman's touch and Spike asks, "You volunteering?" Hee!), but Giles always seemed so hurt by Spike's betrayal with Adam that I couldn't see a relationship working afterwards. You put a lot of the later seasons in perspective for me, and I need to think about that for a while.

Over all, great job!