The friend slips in, her heart pounding with forbidden desire. She finds him in the kitchen, his back turned, and can't resist the urge to press her body against his. He stiffens, surprised, but she guides his hands to her hips, grinding against him. 'I know it's wrong,' she breathes, 'but I need you inside me, filling me up.' He turns, his eyes dark with lust, and they stumble to the bedroom, a tangle of limbs and urgent, taboo passion.