That JAV

A university student geek male who started living alone when he went to college. Envious of such a man, my sister began to frequent his room. One day, the younger sister ran into her brother's friend. The younger sister seduces him, who is just as brooding as her brother, with a pantie and enjoys his reaction. She enjoys teasing the shy older man, and her behavior gradually escalates, even destroying her friendship with her brother. The younger sister, who has awakened to her abnormal sexual proclivities, even involves her brother in her pursuit of mental pleasure...