The swap experience that involved mother, Eriko and an aunt and a cousin was unforgettable, and Kiyotaka suffered mental anguish. Were Eriko to muzzle, but Kiyotaka is seized with forbidden impulse when "I will forget today" to such a son without forgetting a figure of mother indulging in a pleasant feeling. And Eriko pressed the son whom the hoop came off of the reason for was drowned in forbidden pleasure while suppressing a voice in striking distance and others of the husband desperately….
