In the dim light of the den, the brother's eyes gleam with forbidden desire as he watches his sister, her body ripe with youthful curves, bend over to adjust the volume on the stereo. He can't resist the primal urge that surges through him. He moves silently, a predator stalking its prey. He grabs her hips, grinding his erection against her ass. She freezes, then struggles, but he's too strong. He spins her around, his hand clamping over her mouth to stifle her protests. He undoes his pants, unleashing his throbbing cock. She's terrified, but her body betrays her, her pussy dripping with unwanted arousal. He forces her down to her knees, his cock slapping against her face. "Suck it, bitch," he growls. She hesitates, then opens her mouth, her eyes filled with tears and shame as she takes him in.