Okay, i am gonna be really honest here.
The game is really good with a decent story ^^
The art is also pleasing :)
But...
I wish you offer us more option and maybe you could use variable more.
Also i really wish we could choose who get to have our v card rather than the uncle forcing us. Afterall it should be okay since in the beginning of chapter 4 we already resolved our determination.
You should let us to be able to focus on only 1 person or be as poly/free as possible. I personally wish to only focus on the brother and give my all to him :D
So despite the hotness of the situation with the uncle, its really making me feel displeasure. Hope you can see my advice and it can be of some help :)