In the sweltering heat of Phoenix, Arizona, Michelle and her stepbrother find themselves home alone and bored. They each retreat to their rooms, Michelle teasingly stripping down to her panties and fingering her wet pussy while her brother, overheating, decides to take a shower. Catching Michelle in the act, they argue, but later, their lust takes over. Naked and erect, Michelle takes in her stepbrother's huge cock as he jerks off, her own desires growing. They're about to act on their mutual longing when someone unexpectedly arrives, forcing them to stop.