When their parents leave for the weekend, two stepsiblings, both horny and bored, find themselves drawn to each other like magnets. She starts masturbating in her room, only to have him catch her in the act. Instead of being scandalized, he joins her, and they spend the weekend exploring each other's bodies, from hot make-out sessions to intense fucking. Their secret tryst is only interrupted when their parents return, leaving them to wonder if they've just crossed an unforgivable line.