Shiori is living at her parents' home in the countryside, spending her days without stimulation. She was interested in erotic things and was suffering from information and videos on the internet. One day, her sister and her husband were coming home for the first time in a while, and her house was already buzzing with activity. That night, after a meal with her family, Shiori ends up seeing her drunk sister's husband's cock. Even though she didn't even have an erection, she was shocked by how big it was. After that, Shiori's head is already filled with her stepbrother's cock, and she finally sneaks into the room where her sister and her husband are sleeping.