Renan, the younger brother, can't resist the allure of his sister Marilia's curves. One sultry night, he sneaks into her room, his heart pounding with forbidden lust. Marilia, awakened by his presence, feels a thrill run through her as she realizes his intent. She spreads her legs, inviting him in. Renan dives in, his tongue flicking and probing, tasting her sweet nectar. Marilia grinds against him, her pleasure mounting, before she flips him onto his back, straddling him, and impaling herself on his hard cock, riding him until they both cry out in release.