Mother's back was stiff and aching from daily housework and lack of exercise. While relaxing at home to ease the pain, she noticed her son returning home. In her son's eyes, the large black flesh mound visible from her back sparked an unusual fascination. As he offered to massage her, his hands reached out, gradually spreading warmth across her lower back. Though initially surprised and resistant, as her son's hands began sliding toward her crotch, her body overpowered reason, growing intensely aroused.