The stepbrother's massive cock tents his pants as he listens to his sister's muffled moans through the door. Pushing it open, he finds her on the bed, legs spread, a huge dildo in her hand. She's too lost in pleasure to notice him. He strokes his cock, watching her fuck herself, her tits bouncing, her pussy glistening. As she cums, he can't hold back, his cock pulsing, a thick stream of cum shooting out, coating her bedsheets, a silent testament to his forbidden desire.