Identify Against Brother

[gela56]

I am trying to remember the game where you return home and your father takes your allowance away and forces you to fight against your brother
in the game you are corrupting your mother and sisters and it has a plot twist where you figure out that your father pitted you against brother in the fight
and you try to stop your fathers corporation or something like that, you will remember instantly if you have played it the corporation made your mother and sisters mindless sluts

 

[Aldoril Sharpe]

This does sound like the thing I'm playing right now... if by "fight" you mean figuratively gaining ownership of Dad's Company.
Does it look like this? https://f95zone.to/threads/midnight-paradise-v1-0f-extra-lewdlab.25081/
If it is you just might have spoiled the ending for me, though It's a very slow game