Argh!

I've been trying very hard to find this story for you, because I seriously just read it myself not that long ago and knew immediately the fic you want (well, aside from the title and author...). I know it wasn't Like Warm Champagne. This was a small part in a larger story in which Spike and Buffy had already gotten together. I'm 90% sure I read it on this site, but I've tried every search term/phrase I can possibly think to try so maybe it was posted elsewhere. I will keep trying; I just wish I could remember more about the rest of the story!