Beautiful mother Rena Ozaki struggles with daily housework. Today, her son uses an electric massager on her again. It seems this playful trend has caught on among the boys, and their innocent pranks show no sign of stopping. Though confused by his actions, the mother can no longer suppress her emotions, becoming wet as her inner turmoil deepens—leading mother and son into a forbidden relationship. This story captures the delicate emotional entanglement hidden within ordinary family life.