Vampire Riley Challenge

So, in Season 5 Riley gets all insecure about not being needed, or manly-enough or something dumb and decides the way to deal with feeling that way is to go to a suck-house on a regular basis and let vamps bite him. Which, by the way, is like the Buffyverse version of cheating and developing a drug habit at the same time. Just saying.

Anyway, the challenge, should you choose to accept it, is to write a story where one of Riley's visits to the vampire-babes goes terribly wrong and he's turned into a vampire.

From there the rest is up to you. But, of course, Buffy and Spike have to team up to defeat the evil Riley.

Bonus points if Riley and Harmony team-up.