Seiji, the stepson who got brutally dumped. Seiji tries to distract himself from his loneliness without a girlfriend through masturbation. Seeing this, his mother Saori feels sorry for him and makes a proposal. 'I can let you do it up until quasi-sex.' Seiji can't believe his ears, but he also can't refuse his mother's kindness, so he accepts the outrageous proposal. Every time they do quasi-sex, his lust swells as his crotch becomes slick… He starts moving his hips deliberately to rub against her clitoris!
