At some point there probably needs to be an Akebi-Erika “You know what sex is, right? And that two girls can have it?” conversation, because that certainly seems to be the long-term destination. (Smokin’-Hot Mom with the girls’-school-prince haircut might have some insight to share in this area.)
I have no basis for this, but I'm 100% sure that both of Akebi’s parents are raging bisexuals that saw a lot of action before settling down.