In the confines of their shared home, a brother and sister find themselves alone and horny. He strokes his cock, the sound of his hand moving up and down the shaft echoing in the silence. She watches, her breath hitching as she imagines that thick length inside her. Unable to resist, she starts rubbing herself, her fingers working her clit in time with his movements. Their eyes meet, the tension palpable. They're siblings, but the desire is undeniable.