There's still 2 "is this incest?" topics to go after this one, one is Iris wanting to eat out Erynn, the other is who is Gabi to Santiago?
That's not counting people wanting to have a go on "possible mom's GF" Brooke or Adriana... because these ones are just theoretical.
Iris is interested only because she feels the bond between sisters. once she knows they are actual sisters, she will drop her romantic pursuits instantly. I don't think there was any doubt about it. she just wants to be close to Erynn, basically
and finds her big sister to be perfect.
Gabi, we already know too because of Patreon. it really messes up the drama. but at least, we can enjoy how Nyx resolves the drama. the photo of the two in the bedroom is hard to explain, though, if she was married to someone else. people only have that for marriage or for family, and Santiago can't be either.
If Gabi is/was with Santiago the only way round it is if they were never actually married (same situation as Nikki and Cara, because Andres didn't marry their mom despite being in a relationship with her they don't count as stepsisters). I can't see Iris getting anywhere with Erynn, there's been no indication that Erynn would be interested in girls anyway so she'd just shoot Iris down anyway, if Erynn did have any bi-curious tendencies then there would have been a hint that she had experimented with Lexi in the past.
There's no link between Adriana and MC's mom romantically, I think if you go "mommy Brooke" route then she'd be off the table, I'm not sure that Brooke would be on the table for MC anyway but if she is it's only if you don't encourage her to pursue MC's mom.
Erynn and Lexi did experiment in the past. on the beach, MC asked if they kissed before. there was no reply, but a very explicit reaction shows that there was a least a kiss, maybe a little more.
yeah, I agree, Brooke could become available if MC pushes her towards Emily, and then she gets rejected because Emily cannot get involved with the staff or something like that.
Adriana and Emily were roommate, so there might have been some action when Emily came back drunk in the dorm. we only know of one story for now and we don't know if that was the whole story
the infrequency of Adriana's stays in the dorm would make it very unlikely though. but it would be funny. the future beach date could reveal interesting stuff