Thayana Babyy hires a personal trainer because she wants to get in shape, but the trainer doesn't show up, so she asks her stepbrother for help. Dani is not very interested in helping her, but Thayana convinces him. She doesn't enjoy working out and finds all the exercises too much trouble, but she doesn't stop trying. When it's time to jump rope, Thayana's huge natural tits slip out of her sports bra and Dani sees her stepsister's appetizing tits. From that moment on, Dani feels uncomfortable with the situation and at the same time feels his cock getting hard, thinking about those huge tits. Thayana notices the bulge in Dani's pants, and decides to exercise the huge cock she guesses he has.