I doubt Sienna will ever be a love interest in the game.
And she seems to have a good relationship with her boyfriend, dont see they ending their relationship any time soon.
And i dont read much into the attractive thing, after all her BF also finds Layla and Elena attractive iirc.
she doesn't need to be an LI for them to fuck.
like I said, her boyfriend also likes MC. they can try a MMF threesome, or her boyfriend could share.
You made me think something, considering how this dev usually works and the love for drama, is their parents relationship really perfect? And if we consider how much dev is hiding Alexis father identity, drama is coming..and dev is probably using the "incest" thing to hide the real problem.
no relationship is perfect. but it's presented as a very good relationship in the present. in the past, they had tons of drama for sure, like the fact that they had their first child very young and had to deal with that, or the fact that he has a very demanding career and was pretty much absent from home all the time (hence the dogs), and he had to choose between his career and his family...
I am convinced that Alexis and Layla are not blood related sisters, Either way, they didn't go to the same schools growing up. This makes me think Layla's dad is Santi, and Alexis is Adriana's daughter with a different man before Santi. But of course, it's all misdirection and half-truths to keep everyone off balance. It's damn good writing either way.
Alexis and Layla having different fathers doesn't really matter.
but as long as Nyx wants to be funded by Patreon, MC cannot have the same father as any of the girl he can fuck. so there is no way Santi is anyone's father other than MC's.