The niece's eyes widen as she spots the glistening wetness on her aunt's fingers, the evidence of Sarah's arousal. The sight of her aunt's fingers, slick with Sarah's juices, pushing into her girlfriend's pussy sends a surge of heat between the niece's own legs. She can't help but imagine the sensation of those fingers inside her, the taste of Sarah's pussy on her aunt's lips. The room fills with the sounds of wet kissing, moaning, and the rhythmic slapping of flesh as the aunt and girlfriend engage in passionate, unbridled lovemaking, the niece's voyeuristic pleasure growing with each explicit detail.