Maiko's son loved butts. So much so that he even bought a butt masturbator. One day, Maiko was exercising on a balance ball to stay healthy. Seeing this, her son realized that his mother had the ideal big butt. One day, her son helped his mother with her exercise. "I need to give myself a massage after exercising," he said, rubbing his mother from her ankles down to her butt. His mother was puzzled, and he told her, "Butts are stiff," as he rubbed her crotch, and even inserted his hardened dick into her pussy...