As the hours pass, the cramped space becomes an oven of pent-up lust. Rob, her skinny frame shivering with anticipation, can't help but notice Matty's growing bulge. He catches her looking and grins wickedly, knowing she can't resist his free-use charm. With a swift motion, he pins her down, his massive cock already hard and ready. "You're mine now, Stepsis," he growls, pushing inside her with no preamble. Rob gasps, her tight pussy struggling to accommodate his size, but soon she's moaning in pleasure, her body betraying her as she grinds against him, eager for more of his thick cock. Their taboo fucking becomes a dance of dominance and submission, their bodies slick with sweat and spent fluids.