Three Days Without Her Parents, Nagi Yasaka Trained Her Adolescent Sister, Who Attends An Idol Training School, To Become A Nipple Cumming And Big Dick Crazy Before She Could Sell.

Nagi spent her days devoted to training at a talent school, aiming to become an idol. One day, her parents said they would be away from home for a few days, leaving her alone with her older brother, Yuzuru. Yuzuru is an otaku who looks at his sister Nagi with special feelings beyond that of siblings, secretly filming upskirt shots without her noticing and licking the rim of juice bottles she drank from, engaging in perverted acts and treating her as a sexual object. Taking advantage of their parents' absence, Yuzuru's perverted behavior escalates... He uses nipple development and a big dick appeal to corrupt his sister, turning her into his personal onahole idol.