In the throes of masturbation, the sister finds her brother watching, his cock hard. She invites him to join, and soon they're both naked, her wet fingers teasing her clit as he strokes his thick cock. She sucks him off, then climbs onto his lap, riding him until he cums deep inside her. But they're not done yet; they missionary and doggy style, her pussy dripping with his cum until she's filled to the brim.