Clearly I left my brain in my other trousers....

Looking for a fic - Dresden Files/Buffy crossover. Charmingly written Dresden-perspective account of nightly somnambulant orgies; Xander's the only one who can see it. Established Spander; Dresden (and Bob) called in for help - hijinks ensue. Spike has a taste for god-awful rugs and lace doilies. 

... I read it last week, so remember it with irritating accuracy, but I suddenly can't remember the title or where I found it. 

To that end - if anyone else has seen different Dresden/Spander crossover (or any really GOOD Crossover, I'm not terribly picky and... that's how I fell into Buffy in the first place) I'd love to hear about it. 

Thank you in advance!