In the dimly lit room, the siblings move to the rhythm of sensual music. She's face down, ass up, his strong hands gliding over her slick skin, making her pussy throb. He can't help but slip a finger inside her, feeling her tightness. She gasps, pushing back against him, encouraging him. He replaces his finger with his throbbing cock, fucking her hard and deep, their bodies slapping together, her cries of pleasure drowned out by the music.