In a cramped Brazilian bedroom, a transexual sister and her brother-in-law engage in a heated, whispered debate. "I can't stop thinking about your cock," she admits, her hand already stroking his growing bulge. He resists at first, but her mouth, wet and hungry, silences his protests. She swallows him whole, her head bobbing eagerly, before turning around and presenting her ass. He slides in, groaning at her tightness, as she pushes back, fucking him with abandon until they both collapse, panting and spent, in a mess of sweat and cum.