How to please everyone and how to make the game actually stand out:
- Introduce Eric NOT as the waste of a man who is on the run from the mob, instead... bring him as MC's cool Uncle who lives nearby and offers a job to the MC. Who initially is not into the whole perversion thing, but somewhere along the lines between teaching the MC what to do to please a woman he likes (unbeknown to Eric that person being the MC's Mom or sis) to teaching by showing (with his aunt or older sister, eventually leading to his mom), everything got messed up, blame it on the aunt. - this way the player can have the opportunity to accept or not Eric as part of the MC's show. OR keep him as simply voyeur family member and have the aunt be the rotten tomato in the perversion basket.
- This also means, Eric will act as a brother to the mom and aunt and not as lecherous criminal on the run. This also makes it a Big Brother inception sort of scenario... A big brother corrupted into perversion by the big brother of the parent. If that isn't a twist, I don't know what is.
- Introduce the aunt in the later half of the game as the troublemaker sister who brings over your cousin (male/female/futa, let the community decide or go bananas with all three paths) - she arrives after the MC started his perversion path, she's the one that refines and pushes the boundaries.
- have the MC get corrupted by the Uncle (Eric) or the older sister or both into being more perverted with the family.
- turn the whole plot into a story of how the MC is trying to either get into a nearby collage or start his own business (teacher and students paths, colleagues paths) while trying to lay as many women as possible.
- Possible jobs: Uncle's business, Aunt's partner/manager, His own man, various jobs... each a possible new character to add.
- Training: MC can study at the library (get to know the hot library worker there), at school (catch the attention of the hot dean), or at home (get help from his mom). MC can train by running in the park (jogging with family later, could even use it as a means to strengthen their bonds). MC is trained by Eric.
- Past story - forget the original BB story of the character, mom got left in the woods and all that, we don't need drama and traumas at that level. Normal family doing normal stuff till the aunt fled from home and the uncle went to the army. Mom wins the lottery and she has no money problem but still feels the need to find a meaning to her life, a career she never had.
- If you really want to get them to stay inside for a while and have a logic behind it, blast them with this story: A dangerous chemical spill happened in the area, residents are advised to stay inside, for a while (patch 0.6 or something when you get the city down). (chemical may induce aphrodisiac sensations to those susceptible). Don't do COVID or other pandemics, we don't want to remember that.
There you go. Nice and simple. NTR becomes optional. Alpha competition becomes optional. You give the choice to the player and as a dev open up the possibility to explore on this theme as many possible branches as you want. Step by step.
Edit: Oh, and I forgot, but good luck with the project, stay positive!