His parents were away, his brother had incest with his sister and invited the neighbor over to visit

Yudzuru is sent to a distant university to distance himself from his sister Natsu and the incestuous relationship they are having. In the end, they met again, and it was Natsu who proposed to him once again. Soon, things got pretty wild as Natsu's libido continued to increase.

His parents were away, his brother had incest with his sister and invited the neighbor over to visit