In the sultry heat of the afternoon, a curious 18-year-old girl finds herself alone and bored. Her hormones raging, she can't help but explore her own body, discovering the pleasure of her first self-induced orgasm. Meanwhile, her stepbrother, also 18, returns home, catching her in the act. Instead of shaming her, he's drawn to her, and they share a heated argument that quickly escalates into a passionate, taboo encounter.