In a closet, siblings huddle, their breath misting in the cold. Michelle's eyes meet her brother's, a silent understanding passing between them. She guides his hand to her thigh, her heart pounding. He tentatively touches her, his fingers tracing the edge of her panties. Their bodies tense, then relax into a rhythm, their breaths syncing. Guilt flickers in their minds, but desire wins out. They strip, their bodies trembling with need. Michelle lowers herself onto him, gasping as he fills her. They move together, their moans muffled, until they collapse, sated and ashamed, their secret forever theirs.