Curiosity and boredom lead an Egyptian Christian sister and her stepbrother to explore each other's bodies. She catches him masturbating and he walks in on her fingering her wet pussy. They argue, but it only intensifies their lust. Naked, she takes in his thick, straight cock as he jerks off. She fantasizes about him fucking her, and just as they're about to act on it, someone enters, forcing them to abruptly end their erotic encounter.