Fan fiction writers use an existing fictional universe (film, novel, etc) to develop scenarios and characters in creative ways within the logic of the original universe. In this paper, I examine the representations of the erotics of pain in two fan-produced, so-called femslash texts describing romantic and sexual BDSM-oriented relationships between the two super powered slayers Buffy and Faith from Joss Whedon’s TV series Buffy the Vampire Slayer. I argue that the fan-produced graphic, hard-core descriptions of safe, sane and consensual BDSM involving Buffy and Faith are transgressive in that they break the rules of how sexualities can be represented in the prime-time TV series that the two female characters are borrowed from. Furthermore, they challenge stereotypical ideas about female sexual behaviour as ‘vanilla’. The potential for transgression may explain fan writers’ attraction to Buffy/Faith femslash centring on BDSM relations and the resulting depicted transgressions may account for and readers’ interest in these stories.