"Stop it!" Reiko scolds and calms him, but it doesn't reach her excited son. Reiko is carried away by the momentum and accepts the forbidden relationship. "Just once," she insists. But the mistake that was supposed to be a one-time thing turns out to be the entrance to a swamp she can't escape from. The moment her son's cock penetrates her, Reiko forgets she's a mother and returns to being a woman. She never imagined they would be so compatible... Reiko, who got a taste of her son, was unable to stop herself.