"You... you've grown such a good dick?" My sister, who was originally a nymphomaniac but too busy to have sex, was at her limit with pent-up frustration. My dick, seen while she was masturbating, was an unexpected home run!? Her insatiable sexual desire, fitting for her amazing body, didn't care who she was with anymore! Whether it was morning or night, she would arbitrarily make my dick erect and ride it relentlessly! With her exquisite body being violated every day, I can't be satisfied with anyone but my sister anymore...