Karen, the older sibling, has always been the responsible one, but tonight, she's driven by an insatiable hunger. She seductively strips for her brother, her large breasts heaving with anticipation. She climbs onto the bed, her wetness dripping onto the sheets. "I've been taking care of you for years," she whispers, "now it's time for you to take care of me." She grabs his throbbing cock, guiding it towards her eager pussy. "Don't be shy, cuzinho. You're a man now. Treat me like one."