In the dim closet light, the siblings' bodies press together, hearts pounding. Michelle's breath hitches as she feels her brother's throbbing erection against her thigh. She tentatively reaches down, guiding him inside her. He gasps, fingers digging into her hips. They move tentatively at first, then with growing urgency, their bodies slick with sweat and desire. The closet fills with their stifled moans, the creaking of the door, and the rhythmic slap of flesh against flesh.