A sorority of sorceresses
Before you ask, no, I never watched American horror Story 3 (which was witches but point still stands)
College campus has a Sorority with a big secret: all of its members are practicers of dark magic. From initiation to graduation, these girls learn to harness the dark arts for their own benefit.
What sort of misadventures can they get up to?
1. Following a new girl a sister she goes through hazing and participated in increasingly sensual rituals.
2. "Virgin sacrifices" beings they've made a pact with are displeased and demand sacrifice...though not of blood. Queue the girls stalking anyone they think is a virgin and trying to get them to have sex with them.
3. A witch comes to campus and sets about twisting their rituals around to try and clean things up...who will win.
4. An attempted curse backfires when the girls transform a rival into a werewolf. Now they have a very horny wolfgirl running around who won't rest until the moon goes down and all of them are fucked .
What other things could happen at the Sorority?