The sister, her pussy aching with need, can't help but admire her brother's massive cock. She's seen it before, of course, but today, it's different. Today, she can't stop thinking about how it would feel inside her, stretching her, filling her. As they stand there, their eyes locked, she makes her decision. She drops to her knees, her hands trembling as she unbuckles his pants. His cock springs free, thick and hard, and she wastes no time, wrapping her lips around it, her tongue swirling as she takes him deep into her throat. He groans, his hands tangling in her hair as she begins to suck, her hunger insatiable.