Griff and his sister, locked in a power struggle, can't resist their taboo desires. She taunts him, "You're not man enough to make me cum." He silences her with a passionate kiss, then spins her around, hiking up her skirt. She gasps as he slams into her from behind, fucking her hard and fast. Their bodies slap together, sweat dripping as they chase their release. He grunts, pulling out to cum on her ass, leaving them both panting and spent.