I don't remember the name but the story goes like this. I'm guess a brother and his sister gets into a fight. The brother goes into his room and plays a game. It seems to be a hentai game sucked into the game as the main character. The character he meets are people he know sin the real world (especially the person he is trying to save resembles his sister. I remember he gets forced (meaning force to have sex) by the queen somewhere near the end. When he finally escapes the game world he has sex with his sister. (or I think its his sister.)
