Her husband is a serious, studious type. Shiori didn't really like her brother-in-law because he was rough and sweaty. However, when she heard that he was coming to stay from the countryside, she couldn't say no and her mood was down. She asked her husband to have sex for the first time in a while, but he said he was tired, and she was getting frustrated. On the day her brother-in-law came over, she was put off by his country-like appearance as usual, but Shiori noticed something strange about her brother-in-law. It was a bulging, clearly large penis. Shiori had been sexually frustrated recently, and when she saw her brother-in-law's penis, something hot welled up inside her. Shiori fantasized. Her brother-in-law's penis pushed Shiori's mouth open and hardened in the midst of her breathlessness. She knelt before her brother-in-law, carefully licking him, wanting him to insert it. Before she knew it, she was playing with her private parts with her own fingers and reaching orgasm...