I'm not looking for it to turn into a case of as soon as any woman gets fucked by Bobby she rolls over, falls in love with Bobby and is submissive or anything like that. I hate games where the hostile woman is suddenly tamed by the protagonist's cock (unless the hostility was all an act, which shouldn't be the case here). There could be a long, antagonistic relationship between Bobby and Liza for example long after he first has sex with her, with her hatred of Bobby growing even more over time even as her body itself is more forgiving of him. But he has blackmail info on her and perhaps other leverage of just shame. Liza can be the one that the player gets to temper their sexual energy on while other relationships do more of a slow build. It's mainly that Bobby does have leverage on Liza, and as a horny young guy and someone with supposedly few moral qualms, he should be trying to push things as much as he can. Maybe he pushes too far, but instead of a game over its scrambling to do damage control or assert dominance either over who he went too far with or with Anna so that she won't take action or even listen to whoever it was.
At this point I'd probably also limit the game over scenes because while they do offer some fun, they also ultimately take away from the build of tension and the "real" thing when it happens. I don't want to be in that "real" scene and getting a sense of deja vu because I've seem similar scenes with the same character before that weren't real. Its a delicate balance of building tension but bot blueballing the player, and also keeping the story somewhat realistic within the twisted confines of incest game logic. Rainces excelled at blueballing players. Zip is giving us other avenues for fun, although for me its the risk of making the real act less impactful. I'm only interested in so many dream/fantasy/sleepsex/game-over scenes before I want or need the real thing. What I'm really looking forward to is a scene where Bobby is taking one of the women when they are fully awake, its fully real, quite possibly not at all consensual, but comes at the right time in the story for that woman. For me, I think we could make an argument that this is Liza's time where Bobby can act and not have it be an immediate bad end, or he just needs to set the hooks a little more before he's ready to act in a more bold way. Then Liza's relationship continues concurrently with Bobby's attempts to seduce/corrupt/whatever the remaining women which could be a longer process. Although it still shouldn't be drawn out too far. If I were Zip I'd give this particular game his focus for a while, but then wrap it up and use his experience and his fans to pivot to the game he wants to do, where he can make the nipples as dark as he wants. If he does this current game right, he'll have quite the audience for his follow-up act where he doesn't have to be limited by another dev's history.
I'm not a fan of bad ends either, it takes you too far out of the story, but I do like altered consciousness scenes (Sleep, Drunk, Drugged, Hypno, Tricked etc), when you get to fully conscious scenes there really isn't any going back. You have to think of ways to escalate to keep it interesting and there aren't too many directions you can go from there.
I think for the most part the women of the household should be "sacred" in that you can't move too fast with them even with blackmail, they know the MC too well to put up with that shit, they'd either refuse to believe he'd act on the blackmail calling his bluff or straight up kick his ass (a'la badends).
Instead I think the best way forward would be the attack their close friends and get "caught" by them, planting the seed of what the MC is capable off, that he actually does act on his threats.
For example, Imagine Liza's BFF gets caught in a compromising situation by Bobby, who blackmails her into more and more deviant acts, eventually when she is in full slave mode, Liza catches them (seeing her BFF sucking of her brother), she confronts her and discovers that she didn't have any choice... Bobby takes advantage of the situation by fucking the BFF in front of Liza forcing her into a situation where she can't leave without selling out her friend... Now that the ice is broken Liza is now primed for her own blackmail arc starting small with things she can justify as "supporting her friend" rather than "submitting to her brother", slowing phasing out the friend until there is no doubt she is her brother's slave.
For the Mom, I'd simply take her down a Lush path, turning her into an alcoholic sex doll, abdicating power gradually to Bobby (the new provider for the house).
For Lucy I'd like to take control of the Cheer team first, (with Lucy eager to join/please them), trying to get them to accept her, use them to "dare" her into doing stuff Bobby can take advantage off firstly without her knowledge (7 minutes in heaven with a Masked stranger type stuff), then more and more conscious dares once she is sufficiently slutty.
But like I said at the start I'd save most of their conscious content for late game, bring on the friends (maybe an Aunt or two) for immediate "real" scenes, people who don't know Bobby well enough to be certain of his limits and who aren't close enough to the other main characters to confide in them until it is too late (secrets and insecurities are key).
JM2C
