A Posterior Ensemble

Courtney and Kelsey are college professors at a state school in the greater Cincinnati area. They have been friends since childhood and were even in the same sorority during college. They make up the foundation of the special ensemble of women that share the same interests. Morgan and Fiona are students at the college where Kelsey and Courtney teach. The younger girls are charter members of the exclusive quartet.
The four women are linked together in other ways beside the college. Morgan lives with Courtney her professor and they share an open relationship. Fiona and Courtney have been lovers since they were in their teens, which continued even after Courtney got married. Courtney's marriage was short lived, and she had Morgan move in with her as soon as her divorce was final. Fiona also a student had been in a relationship with Morgan prior to Morgan's involvement with Courtney.
Even though they were lover's; Morgan and Courtney weren't ready to give up Kelsey and Fiona as lovers something both Morgan and Courtney agreed upon. So the quartet established a relationship structure where the four of them share each other interests, and their love. Not for everyone but it works for them.