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Kiyotaka couldn't forget the swap experience that involved his mother, Eriko, his aunt, and even his cousin. Eriko tells her son, "Let's forget about today," but Kiyotaka cannot forget the sight of his mother drowning in pleasure, and is driven by a forbidden impulse. And Eriko, who was pressed by her son who was out of reason, was drowning in forbidden pleasure while desperately suppressing her voice right next to her husband.