Shiori has no one to pay attention to her because her husband is constantly away on business. Even though she just remarried, her sexual frustration has reached its limit. Her stepson, Tatsuya, is casting passionate glances at Shiori. He says he's actually always loved her. However, no matter how sexually frustrated he is, father and son can't have sex. He tries to calm Tatsuya down, but in his excitement, he pushes Shiori down. His powerful thrusts don't stop even after Shiori has come, and he continues his thrusts until she loses her voice...