Hidden behind the worn velvet curtain, the siblings' secret tryst begins. The sister, a nymphomaniac in training, begs her brother to defile her, to make her his whore. He resists, but her tongue, tracing his ear, her breath hot on his neck, breaks his resolve. He spins her around, bending her over, and enters her roughly, her tight pussy stretching to accommodate his thick cock. She screams in ecstasy, her fingers clawing at the ancient stone wall as he pounds into her, their bodies slapping together in a symphony of sin. When they finish, spent and satisfied, they collapse into each other's arms, their secret safe, their love unconsummated, their desire for each other burning brighter than ever.