One day, Shihori goes to wake up her son who overslept, only to discover him sleeping with his cock exposed. She quietly covers him with a towel and leaves the room, but notices her own pussy has become wet. That night, she tries to initiate intimacy with her husband for the first time in a while, but he turns her down, claiming exhaustion. The next day, frustrated and sexually unfulfilled, Shihori attempts to work out to relieve tension. When it doesn't help, she asks her son to assist her. As he supports her while she exercises on a balance ball, she begins swaying her hips provocatively. Watching his mother's movements, the son grows increasingly aroused and starts making advances toward her…