My serious, club-dedicated little sister retired from her club—and now her sex drive is through the roof! Instead of exercising, she’s using me for “cock training”! After retiring from the club she was so devoted to, she’s got so much excess energy and sexual desire that she’s drowning in daily masturbation to relieve her stress! But since masturbation alone isn’t enough to satisfy her sexual urges, she takes it out on me, pushing herself to orgasm over and over again!