A skinny, cute teen sister walks in on her stepbrother mid-wank, his cock rock-hard and ready. She playfully teases him, calling him out on his 'little' secret. He challenges her to help him out, and she eagerly takes up the dare, slipping her small hand around his thick shaft. She jerks him off, her tiny fingers struggling to fit around his girth, before leaning in to lick the precum beading at his tip. Just as they're getting into it, they hear footsteps approaching. Caught in the act, they quickly try to cover up, but the evidence is clear. Flustered, she looks at her brother, his cock still hard and glistening with her saliva, and whispers, 'We're not done yet.'