The intro is nothing but spoilers!
you showed all the sex from the page here and not actual story. I have hopes for this game, but repackaging everything from here is pretty weird to me.
as for how i feel about the models, i don't really like how most of them have huge tits and long nipples. I would like some medium ones at least. Its either huge or none at all and its kinda jarring considering the varrying bodies around the huge tits and ass, like abs and mucsles. midsized ones would be niceas well. As for the NEET-flasher sister. she should be slightly chubby and not as skiny as her sister consdering the different lives they have. Or make her boobs smaller, as well as her frame. not 3 cups bigger than her sister. a lot of the hip to waist ratio is odd since everyone is thin or has a flat stomach, and no body fat to make it look reasonable.
also, if the MC is a grown up please make him taller even by a foot, he looks like a kid compared to all these larger women.
besides all of that, i love the path the game is on, and how silly it is, though i wish the dialog is a bit shorter, and NTR isn't a huge role since almost every game that has the same formula has it and its hard to find games that don't have it forced. I'm really excited for you and the game to grow.