In a cramped French apartment, a brother and sister, bored and horny, find solace in each other's company. The brother, a burly, tattooed lad, strokes his thick cock in the bathroom while his sister, a petite brunette, fingers her wet pussy on the couch. Caught in the act, they argue heatedly, but their tempers soon cool, replaced by a mutual, unspoken desire. Naked, they explore each other's bodies, the sister marveling at her brother's massive cock. As they're about to seal their forbidden love, a knock at the door forces them apart, leaving their taboo lust unsated.