I would probably have been into this if the dev had exercised some self-restraint with the story and theme. Getting dirt on one character at the start of the game would have been fine, two would have been excessive, but three destroys any suspension of disbelief. The MC is just immediately a perverted sociopath willing to destroy his relationship with his family members that he's known his entire life just to get his rocks off while paying only meaningless lip service to "love" for them. Some internal conflict would have been good. Or maybe he and his sister could hate each other for unrelated reasons, that could be enough to "sell" the aggressive sexual blackmail approach. I think the dev is capable of writing this better, but is way overeager to get to the good stuff, to the point of spoiling it.
You are absolutely correct in everything you said.
1. "Getting dirt on one character at the start of the game would have been fine, two would have been excessive, but three destroys any suspension of disbelief."
3 hell even 4 times of getting dirt on a character is a bit much. But it is what it is. But the theme is Blackmail and or by any means he can. As stated in the game description.
2. " The MC is just immediately a perverted sociopath".
This is true. He will either get worse or better with the women in his life based on the choices you make. Be a dick to them all the time, be overly dominant to them if you so choose too. It may not end well for you or others in the game. Show compassion and understanding when shit happens with the women in your life, and he may end up being a pretty nice guy in love with the women in his life. Again this is totally up to you. Even though this is V0.03b, It's really only the 2nd update of the game that will have a shit ton of content. So "Choose wisely my young patawand."
3. "Some internal conflict would have been good."
The story isn't over yet buddy. Just because he's eating his cake and having too at this moment, doesn't mean it will stay that way. Though it might, just depends on the future choices you make.
4. "I think the dev is capable of writing this better, but is way overeager to get to the good stuff, to the point of spoiling it.".
You hit the nail on the head with this. I've played over 500 games here in the last year or so I've been at this site. 95% of them it is a fucking grind just to even get a blowjob out of the main person of interest. Or you have to wait for the 5th or even 6th update to get any action at all. If this is your cup of tea, and like getting blue balled waiting for action, this isn't your game. This is an action-packed sex game. You're opening up a porn company.... There will be tons of sex, not waiting around. You're going to fuck them all and let GOD sort it out in the end. It's all about how you go about doing it.