Living in her brother-in-law's house, Yuna's relationship with her husband gradually deteriorates. As her brother-in-law uses her as material for his novel by repeatedly having sex with her, Yuna sinks deeper into depravity. Pushed to the brink, she experiences extreme situations like being filled with cum until she involuntarily urinates. External forces further drive her to the edge, such as when a delivery man forcefully thrusts his cock into her. Despite knowing she should resist, she finds herself aroused by these acts. Ultimately, she ends up having sex with her brother-in-law right in front of her husband. For her, the worst possible circumstances bring the greatest pleasure. This is the true nature of a married woman who has fallen into corruption.