The heavy velvet curtains cast an eerie glow over the grand, abandoned mansion. Siblings, hidden from the world, indulge in their secret, shameful passion. The sister, her innocence lost long ago, guides her brother's virgin cock into her eager, dripping cunt. The sound of their bodies slapping together fills the room, drowned out only by their labored breaths and stifled moans. They fuck like animals, their bodies slick with sweat and desire, until they collapse, spent and panting, in a tangle of limbs and discarded clothing. Their secret safe, they dress quickly, their hearts pounding with fear and exhilaration, already anticipating their next forbidden encounter.