In a tight, dimly lit closet, a brother and sister succumb to their hidden desires. He's rock hard, his cock straining against his boxers, as she grinds against him, her panties soaked. They're both shaking with anticipation, their hearts pounding. She reaches out, tentatively touching his cock, feeling its heat and hardness. He groans, then she's on her knees, taking him into her mouth, tasting his salty pre-cum. He grabs her hair, thrusting deeper, his balls tightening as he nears climax. She looks up at him, her eyes filled with lust and fear, ready to swallow every drop of his forbidden milk.