Rob's sister, desperate for relief, turns her attention to her brother's ass. She positions him on all fours, admiring the view before spitting onto her fingers. She circles his hole, applying pressure, and he relaxes, allowing her entry. She pumps her fingers in and out, feeling his heat. Her other hand wraps around his cock, stroking it in sync with her thrusts. She uses him, her pleasure building, until she's panting, her fingers fucking him faster, her grip on his cock tightening. She comes undone, her brother's ass and cock serving their purpose.