Sorry it's not much to go on and I apologize if I mix fic descriptions. I've read An Unfriendly Wager and I feel like I may be getting the one I'm looking for, confused with that. Or maybe they are similar story lines.
In this one, I think they are in high school. There is some form of contest like a bid to win a date thing. Buffy is pushed to enter by a friend and Spike bids on her, then wins. He makes her be his slave for the duration of the time that he's 'won' her. I think she like cleans his room and makes him breakfast or something. I feel like I remember a scene where they end up having sex on his car? Outside or in the garage? |