I've gotta say, I agree with Opalescent. Some, or even many, hierarchically-structured relationships may have problematic elements, but I don't think the word "cult" helps us untangle what those might be. I would save that polarizing label for the occasional situation that may actually deserve it.
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.