Satomi married a divorced man and started living with her stepchild, Ryuichi. One day, while Satomi was cleaning, she noticed Ryuichi playing with his smartphone in the living room. When she looked closely, she noticed that Ryuichi was fiddling with his bulging crotch. His huge penis, which was incomparable to her husband's, was not in a stable position, so he was fiddling with it to fix it. When Satomi found out, her body started to heat up...