Ryuta, my older brother, is a semi-recluse, and he had built a sexual relationship with his younger sister, Nenne, a female student. Nenne knew it was wrong, but she couldn't refuse Ryuta, who was kind to her, and although she hasn't had intercourse for many years, she continues to have oral sex. One day, Kameda, Ryuta's friend from his student days, comes to visit. Kameda sets his sights on Nenne's big breasts, threatens him with his relationship with Ryuta, and plots to pin Nenne down...
Auroa Project
