In a moment of confusion, the brother's cock finds itself not in the warm, welcoming pussy he'd intended, but in the tight, unyielding grip of his sister's virgin ass. He hesitates, but her feverish response spurs him on, and he begins to pound her relentlessly. She claws at the sheets, her face a mask of ecstasy and disbelief as he stretches her untouched hole, filling her with a pleasure she's never known. Their bodies slap together, a symphony of carnal desire, as he fucks her ass with wild abandon.