Unable to suppress her craving for anal pleasure, she becomes consumed by overwhelming sensations and the fulfillment of her masochistic desires. Confused yet drawn to the stimulation, she finds herself unable to stop. Lured by her former homeroom teacher after reuniting, she follows him to his room despite her husband waiting at home. Overcome by guilt and the thrill of betrayal, her desire for anal penetration grows uncontrollable, pulling her deeper into forbidden pleasure. Under the teacher's hands, her anus is gradually trained and opened, her body transformed into something increasingly lewd. Lost in the ecstasy, she forgets everything about herself.