Tsubaki had sex with her husband for the first time in a while. She wanted to do it again, but her husband was too tired. The next day, Tsubaki went to wake up her son. As her son turned over in his sleep, she noticed his grown-up crotch and swallowed her saliva. That night, while her son was bathing, Tsubaki couldn't help but smell his underwear. She masturbated, imagining herself being aroused by her son's erection. One day, Tsubaki was masturbating in the kitchen when her son walked in and saw her. He was already hard. Tsubaki reached out to his cock...