Trapped indoors, a brother and sister, bored and restless, find solace in each other's company, their eyes straying to the growing bulge in his pants and the dampening of her panties. She idly strokes her hairy mound, teasing him with glimpses of her fingers disappearing into her wet heat. He tentatively reaches out, brushing her nipple through her thin shirt, feeling it harden at his touch. They're on the edge, ready to dive into taboo waters, when a noise from downstairs jolts them back to reality.