I'm pretty sure it was Spander, because, honestly, it's not like I read anything else.
In it, Xander was completely blind and like, a superhero. He hid it from Buffy and Willow, but he actually goes out in a suit at night and beats up baddies. And of course, runs into a certain vampire.
Either I just never finished it, or it was never finished. Hopefully the former, for the latter fills me with dispair.