it's not your son's premature leak. Asagiri Ikka (flower of the morning fog)

Ippa was not satisfied with her single husband's sex. One day, Tatsuya, Yumiko's son, appears under Ichika at a wellside meeting with the mother of the Takada family next to her. It was a surprise to Tatsuya who had transformed into an adult man without seeing it for a while, but Yumiko treated Tatsuya as always as children .... Ikka, feeling sorry for Tatsuya, accidentally looked at Tatsuya's masturbation and knew that the lower half of Tatsuya's body was also completely grown up.