Your son doesn't have short phimosis.

After several years of marriage, Nao began to feel dissatisfied with sex with her husband. One day, he comes across the mother of the Yamada family living next door scolding her son Yoshiyuki. Her son is forced to buy a futon door-to-door, and his mother, unable to control her anger, cruelly dismisses Yoshiyuki by calling him ``Shorty son!''. After that, Nao accidentally witnesses Yoshiyuki masturbating. Nao's cock, which had been criticized by her mother as "short", is actually quite impressive, and Nao can't help but go up to Yoshiyuki's room...