Basically I remember a VN game that at the time was in sort of unfinished stage, there were choices involved, but from what I remember about the story, you play as a guy and you have a sister. You also have a girlfriend, there are some things that happen in between points but basically additional friends and your sister are having a house party and at the end everyone is deciding who sleeps with who, and you can choose your girlfriend, some other friend or your sister, if you pick your sister, when she falls asleep, you can try to grope her or dry rub on her bottom, there was a meter that you could follow as to not wake her up, I don't remember much more but if anyone knows this game I'd appreciate to know what the name of it was.