Returning home to her in-laws' house with her husband, married woman "Riri" finds herself alone when her husband rushes back due to work troubles, leaving her in the quiet intimacy of her in-laws' home. Her lustful father-in-law, unable to resist, pulls her into his arms and begins to desire her. The stillness of the night at the in-laws' house marks the beginning of their affair. Excited by her father-in-law's insatiable stamina, she continues to be thrust into even in the morning. Driven to orgasm after orgasm, she's overwhelmed by pleasure, yet torn by guilt and the thrill of betrayal. Ultimately, she chooses to accept both the pleasure and the forbidden affair.