The serious son-in-law, 'Kouzuke,' has been attracted to his mother-in-law, 'Suzuka's,' huge breasts for a long time. One day, when he finally had the chance to be alone with Suzuka, he drugged her with sleeping pills and used her huge breasts to masturbate. However, he was caught right after ejaculation. Suzuka forgave Kouzuke as a momentary mistake, but Kouzuke could not control his twisted sexual desires due to Suzuka's kindness…
