In the throes of teenage boredom, a brother and sister find themselves alone, their hormones raging. They start to masturbate, each thinking the other is out. The brother, overhearing his sister's moans, catches her in the act, her body flushed and glistening. They argue, but the tension is undeniable. Later, they confess their desires, naked and vulnerable. He strokes his thick cock, she touches her wet pussy, and they're inches away from fucking when their mother walks in, forcing them to halt their heated embrace.