My own sister saw me masturbating in a younger sister erot*c game. My younger sister, who always has a straight face, then somehow decided to help me m*sturbate. …… She made my friends wank and even got the most beautiful girl in school to get involved. Can I ever get a girlfriend now that I can only get off with my younger sister? And why is my younger sister still watching me m*sturbate? A popular web-based work has been completely revised and new scenes have been added! *Main Storyline