Hidden in the shadows, the sister's breath hitches as she watches her brother stroke his stiff, uncut cock. She can't resist the urge to touch herself, her fingers finding their way to her wet pussy. She rubs herself, her moans barely audible as she brings herself closer to the edge. Her brother, noticing her, beckons her closer. She approaches, tentatively at first, then eagerly as she takes his cock into her mouth, sucking him deeply before straddling him, her pussy sliding down onto his shaft. She grinds against him, their bodies moving in sync as they both race towards their climax.