Miu has been married for five years, and every summer, she and her husband return to his rural family home for a visit. She has always harbored a deep dislike for her father-in-law, viewing him as a crude and lecherous man who makes her feel incredibly uncomfortable. Despite her attempts to keep her distance, the tension in the house reaches a breaking point during a quiet night when her father-in-law slips into the couple's bedroom while her husband is asleep. He approaches Miu with a predatory intent, initiating a forbidden encounter that catches her completely off guard.
As he begins to focus his attention on her, Miu finds herself caught in a physical struggle between her moral reservations and her body's overwhelming reaction. Despite her initial desire to resist his advances, her senses are quickly overtaken by his experienced and persistent touch. The sensation of his tongue against her body proves to be far more intense than anything she has experienced with her husband, leading her to a series of explosive climaxes she never expected. This illicit encounter shatters her inhibitions, leaving her confused yet physically satisfied by the raw, taboo attention she received in the dark.
Following this life-altering night, the dynamic between them changes permanently. After fulfilling her duties with her husband, Miu finds herself unable to forget the overwhelming pleasure her father-in-law provided. Driven by a newfound, insatiable craving that her husband cannot satisfy, she begins to seek him out on her own terms. This intense story explores the boundaries of desire and the darker side of family secrets, documenting how one woman’s resentment transforms into a desperate, secret addiction for the forbidden intimacy she discovered behind closed doors.