As brother and sister find themselves alone, the sister's curiosity gets the better of her. She approaches her brother, her eyes fixed on his crotch. Kneeling down, she gently pushes his cock out of his pants and into her mouth. She timidly licks and kisses the tip, her brother stiffening at her touch. She takes more of him in, feeling his length against her tongue. Her brother's breath hitches as she begins to suck, her inexperience evident but her enthusiasm unwavering.