Seems the ghost storyline was rewritten
I think in the earlier version (a few years ago) the vampire scene with Julia wasn't optional. It happened whether or not you wanted it to. And I think the same thing would happen with Lucy. But the dev changed it at some point to what it currently is.
Why he kept the option for the vampire to still have sex with Julia at all is beyond me. It's technically not NTR, but I don't think most players enjoy it and it's a point of contention that could be easily avoidable.
she strangely enough becomes off limits personally no matter how much she clearly feels grateful to you and how much the family is hard on the swinging with you both.
You can still have sex with her alone. Just go to the living room without energy and fall asleep. It's in the achievements list.
Makes me curious how he will address the sister storyline given i doubt it will not end up with scenes there where your sister gets banged by the alpha.
Personally, I don't think this will happen. If it was a few years ago, yes, that would be one of the options. But the dev has since changed his stance (or the supporters made him change it, which amounts to the same thing) and we don't get scenes like that anymore. Just the kinda borderline ones like Ava/Lilith.
I think we'll just get different endings depending on if we're a vampire, werewolf or none. If we're on the werewolf path, the most likely scenario is that we will become the alpha. No real idea on the other two, but they'll probably revolve around killing or otherwise getting rid of the alpha, probably keeping Sylvia prisoner or otherwise available for the MC to have sex with.