It is set somewhere in early season 4, Spike has just arrived, but I don't really remember anything about the Gem. Xander meets up with him, maybe during the Halloween ep? Anyway, they get it on for some reason, and makes a mess of Spike's duster, so Spike gives it to Xan to clean, and says he'll be back for it later and then hes leaving. Xan finds himself not wanting to wash it, maybe getting a job at the Dry Cleaners since he hangs around so much? I feel like it was a WIP, ending with Spike in the Initiative, but that is it.
Can anyone point me in the right direction for this fic?