It's just a tiresome experience man. I eventually got to the point where you advance to the point where you declare love to Diana but after that it said I need to advance even more. Its a real chore and also saying that you may have to be tied to one person in a full house of women in a porn game just sucks. I really think before you make another update that you write some plot out and think where you really want to go with the game.
The grind is ridiculous. I saw a BJ scene with Sara and a HJ with Thalia, and whilst both animations are well done, you totally kill the flow in getting there. As for the other sister, I did all the gym stuff but gave up. I won't be playing this again as its just a waste of time, but you really need to look into what makes RPGM games suck, and a majority of the time its the grind that kills the flow.