A mother's panties, which he normally watches casually while she is mopping the floor, suddenly catches a glimpse of her. A defenseless delta zone is revealed between her plump thighs, and a vertical line is clearly visible in the center. Thirty mothers, who are expecting something but are moistening the contents of their panties, make their pussy lines stand out. As a result, the son loses his senses and turns into a male, attacking his mother, while the mother turns into a female and accepts, and they devour each other for four hours.