Carlos, the doting brother, watches in awe as Fran, his stepsister, struts around in a dress that leaves little to the imagination. He can't help but stroke his big, hard cock, imagining her riding it. Fran catches him and, with a wicked grin, hikes up her dress and slides down onto his cock. She grinds her hips, her tight pussy stretching to accommodate his size, as they both lose themselves in their taboo pleasure.