Yukari Orihara appears, embracing the sweet, mature scent of her honeyed armpit hair. Fujio, ever since witnessing his mother's lush, seductive body and the alluring expanse of her armpit hair as a child, has struggled to suppress his forbidden desire for her, responding with rebellious behavior. Instead of pushing her son away, the mother chooses to attract young men, indulging in pleasure with them. Learning of his mother's actions, Fujio realizes she has been harboring feelings for him all along, leaving his emotions deeply shaken. Drawn helplessly into her seduction, he is lured into mutual masturbation. Then, witnessing his mother bind and dominate a friend, he is captivated—eventually led into a perverted threesome filled with armpit hair, involving his mother and his best friend. This intense, intimate connection and the mother's overwhelming allure profoundly unsettle the son's heart.