Lonely on vacation, a nerdy step-sister discovers her brother's hidden charms. She tentatively strokes his massive cock, her eyes widening in surprise and anticipation. Their parents are away, and the hotel balcony offers a thrilling, forbidden stage. She eagerly mounts him, her big tits bouncing as she rides his big dick in cowgirl, her tight pussy stretching to accommodate his size. He pounds her hard, and her moans echo through the night, intermingling with the distant hum of the city.