Takuto’s cock is so large that his wife keeps refusing sex, leaving him to masturbate to porn or fantasies about his mother-in-law, Mary. Dissatisfied with her own husband, Mary becomes fascinated by his enormous package. Whenever she gets the chance, she claims she is merely taking her daughter’s place and services his huge cock until he cums. Her uninhibited relief soon becomes part of Takuto’s daily life, and before long he cannot feel satisfied without her body.