Rin, a mother who is disciplined in Spartan education, wants to raise her son, Yoshiyuki, to be an excellent lawyer like her deceased husband. However, while Yoshiyuki's grades did not improve at all and stress accumulated, Rin himself became frustrated and was unbearably absorbed in masturbation. Rin is impatient when his son's friend Kenta sees such a situation. However, the carnal desire that was suppressed by reason to his strong cock that erected finally explodes. And while scolding him, he began to play with the standing meat stick ...