Tsubaki had spent the night with her husband for the first time in a while, but her desire remained unfulfilled. Her husband, exhausted, couldn't go a second round. The next morning, Tsubaki went to wake her son. As he rolled over in bed, her eyes fell upon his crotch and she let out a sigh. That evening, while her son was bathing, Tsubaki sniffed his underwear. Tempted by the scent and imagining him aroused, she began masturbating in fantasy. One day, while pleasuring herself in the kitchen, her son accidentally walked in. He was already hard, and Tsubaki reached out her hand...