Revenge & Penance.
Summery/Concept: Willow is still holding on to a vendetta towards Faith for her hurting Xander- she raped him, and Willow regards Xander Harris as her brother, so of course that bisexual/gay woman will desire to get back at the girl who raped her brother, Kennedy loves Willow, so she helps her get her revenge on Faith.
Warning: Basically Willow and Kennedy gang-rape Faith! And in the process of trying to get some payback; they take a trip to Hell.
- Part 1 of Revenge & Penance.