A stormy night, siblings huddle close for warmth. "Sorte," she whispers, her eyes reflecting the lightning. He understands the unspoken invitation, his heart pounding. They share a bed, their bodies pressed together, her breath hot on his neck. She guides his hand under her nightgown, his fingers tracing her wet slit. He's hard, she's ready. Their lips meet, tongues entwined, as they cross the forbidden line.