"My big dick was discovered by my sexually uninhibited sisters!" A popular doujinshi has already been made into a live-action film! My sister caught me masturbating with a masturbator. Apparently my dick is pretty big, so she spread it on social media and held a dick appreciation party. My dick swelled up as I was stared at by the three attractive girls: my sister Chiaki, who has an amazing body, Nagisa, who has sexy dark skin, and Yukiko, who looks pure. And then, to my surprise, I lost my virginity. From that day on, I started having harem sex every day, using my sisters as masturbators.