Reina, who had muscle pain from her part-time job two days ago, struggles to even stand or squat. Then, after using the toilet, she tries to pull up her panties that she had pulled down to her feet...but she can't reach them! Reina calls her son, knowing how embarrassing it will be, to help her. However, contrary to her expectations, her son's gaze is glued to the pussy he is seeing for the first time... The mother, who is obsessed with the pleasure of climaxing while standing, and her son, who feels sexual urges at his mother's lewd appearance, begin an extreme, agonizing, shameful intercourse!