As the siblings huddle together in the cramped closet, their bodies press against each other, the heat between them rising. The older sister's hand, trembling slightly, reaches out to trace the outline of her brother's cock through his pants. He's rock hard, his breath coming in short gasps. She can feel his heart pounding against her chest as she leans in, her lips brushing against his ear. "We shouldn't," she whispers, her voice barely audible. But her words are contradicted by her actions as she begins to stroke him through the fabric, feeling him grow even harder in her hand.