Mistress Cary came home unannounced. She caught her brother trying to jerk off, but he could not do it properly, and he kept slacking off. She watched him for a couple more minutes before she decided to help him. Her brother was at first afraid to see her, but she remained oblivious and began telling him what to do. Her brother could not believe that he was getting jerking off instructions from his sister, but soon he came vigorously.