In the choking darkness of their closet hideaway, the siblings' religious upbringing gives way to carnal curiosity. The brother, his cock throbbing with unspent desire, guides his sister's trembling hand to it, her fingers wrapping around his shaft with hesitant exploration. The sister, her pussy aching with unfamiliar longing, straddles him, her wetness coating his cock as she rubs herself against it. Their bodies move in a dance as old as time, their moans stifled by the darkness and the knowledge of their sin. As they come together, their bodies slick with sweat and their hearts pounding with shame and ecstasy, they know they've crossed a line from which there's no return.