Hrmmm... IDK, I feel like a harem is possible, but it doesn't feel to me like every girl can be in the harem. Gena and Sofia in particular don't strike me at the type open to sharing. I don't think we know enough about Abby to say. I can see Stacy going either way: since she cheated before (despite what she says), she might accept polyamory as "fair's fair"; but also, since she cheated before, she might just use the other girls as an excuse to go elsewhere again (which I think is far more likely). If a relationship ever develops with Mallorie, cat-eared cutie, Natalie, Ivanka, or Tatianna, that could change things as well.