I know there are probably a fair few stories out there where Buffy is dating Riley and ends up leaving him for Spike because he's just too vanilla.
This one that I'm looking for has a scene where Buffy has to go take care of herself in the bathroom after sleeping with Riley once he falls asleep - because he just can't satisfy her. Spike somehow finds out about this (I'm not sure if he is in the house for some reason and walks in on her? maybe he just hears about it) and then it turns Spuffy and they end up together.
Sidenote: there may have been a blue toy involved that she leaves in the bathroom by accident and Joyce finds...however this may be me just confusing two stories together.
Anyone? | 
