MIDA-382 My teenage sister is attending an idol training school, and before she can become famous, I trained her to be a nipple-crazy, big-cock-crazy girl for three days while our parents were away. Nagi Yasaka

Nagi aims to become an idol and devotes her days to lessons at a training school. One day, her parents say they'll be away for a few days, leaving Nagi alone with her older brother Yuzuru. Yuzuru is an otaku and sees his younger sister Nagi with special feelings that are different from the usual relationship between siblings, and engages in perverted acts with her, such as secretly taking pictures of her upskirts without Nagi noticing and licking the rim of the juice she drinks, treating her as a sexual object. Taking advantage of their parents' absence, Yuzuru's perverted acts escalate... I'll seduce my little sister, an idol who is my very own flesh and b**, by developing her nipples and showing off my big cock.