A beautiful wife fallen into pleasure, her vagina developed for orgasms with every palpation... Struggling with infertility, Hikari is encouraged by her mother-in-law to have her uterus checked by her father-in-law, an obstetrician-gynecologist. Reluctant because he is family, she tells herself it's just a medical procedure and the examination begins. With his persistent finger movements, obsessively rubbing her sensitive spots, her privates are soaking wet by the time it's over. Even though she knows it's wrong... she realizes she's becoming a prisoner of pleasure every time she receives her father-in-law's treatment. Before long, she grows bored of her husband, whose sexual appetite and cock are both weak, and finds herself craving only her father-in-law's meat... Trained into a lewd onahole who reaches climaxes so intense she wets herself... they spend their days making time for "examinations" and creampieing relentlessly. Will the child she conceives be her husband's, or...?