A curious teen step-sister, drawn to her older brother's towering frame and growing curiosity, can't help but notice his burgeoning manhood. As they're left alone in the house one sunny afternoon, she decides to act on her newfound desires. Slipping into his room, she finds him napping, his cock straining against his shorts. Gently, she pulls them down, revealing his throbbing member. She tentatively licks the tip, tasting his pre-cum, before taking him fully into her mouth. He awakens with a start, but seeing her eager expression, he gives in to their shared taboo.