In the privacy of their shared bedroom, the sisters' late-night curiosity leads them to their stepbrother's door. They find him sleeping, his cock tenting the sheets. Gently, they wake him, their voices hushed but eager. "We want to try something," they admit, their eyes locked onto his hardening cock. He agrees, and soon, they're exploring each other's bodies, their hands and mouths leaving trails of pleasure. The youngest sister guides her brother's thick cock to her ass, gasping as he penetrates her. The eldest watches, rubbing her own pussy, before taking her turn. Their anal initiation is intense, filled with moans, gasps, and the sound of flesh slapping against flesh.