In the dim light of the attic, siblings Michelle and James find themselves alone, their parents away. Boredom turns to curiosity, and they begin to explore each other's bodies, Michelle tentatively touching James' hardening cock as he strokes her dampening panties. They hesitate, knowing the wrongness of their acts, but the pleasure is too intense to stop. Michelle guides James' cock inside her, gasping as he fills her. They move together, their bodies slick with sweat, until they both climax, panting and guilty, but yearning for more.