This one is a human AU; Xander is a carpenter hired by Spike (I think) to build or rebuild his club and/or tattoo parlor? I specifically remember Xander wearing glasses in this one. He also keeps trying to convice himself that Spike isn't gay and won't be interested in him, until Spike propositions him near the end. I know I found it on someone's website, not on Spanderfiles, and I also know that it's not Weekend Project by Jenny. Sorry this isn't much to go on!