Frustration over the stagnant married life grew, and Reiko (Reiko Sawamura) ended up having a relationship with her son. If discovered, the family would collapse in an instant. This secret must be kept for life... She made up her mind, but as her husband entered the bath, Reiko felt her crotch growing hot and flushed. While her husband was bathing. It was a blank 15 minutes where she could be alone with her son without being discovered. Now was the time... When she turned around, her son was also staring at Reiko with an excited look.