That would ruin the game. Eric is nasty, controversial, but he is the key element that made BB so popular. In few scenarios Eric and Max should live under the same roof, the friends path is a good foundation for that.
I could see that being an interesting game but I don't know that I would ever play it.
Direct competition with the MC throws me off when I want to identify with the MC.
I would like to see a game where the son is corrupting the mother and that's the story we follow. But the sister and father are also in the house and subtle clues indicate something is going on with them as well, we just never see direct evidence of it.
I've got it all in my head. Mom and son have to stay home because of Covid while Dad and daughter work at the hospital and are away all day. Mom and son get closer and start fucking and hiding it and at the same time Dad and daughter start acting more and more suspicious.
One scene in my mind is the Mom and son trying to spend the night together without Dad and sister finding out. Mom, Dad and son are watching TV and sister is in her room. Mom says she's going to take a bath and son is going to bed. We see Mom in the tub and hear someone walking and a door open/close.
Mom checks the living room and kitchen with no sign of Dad so she assumes he is in their bedroom. Mom goes to her sons room and plans to tell Dad in the morning that she read a book after the bath and fell asleep on the couch. But next morning Dad proactively apologizes for not coming to bed last night.
We know he wasn't in the kitchen, living room, bathroom or sons room. He obviously didn't go into their room or he would have known Mom wasn't there. Only doors left are daughters room and front door. If he went for a late walk and slept on the couch then he wouldn't know that Mom never went to bed either. So was it the front door, or did he sleep with their daughter while she slept with their son?
The whole game would be like that and it would never be concrete that the Dad was fucking the daughter but a lot of circumstantial evidence.