Luna gets home one night to find her bratty step-sister Lizzy, who has a smug grin on her face. Lizzy has discovered Luna's diary, and that she's been doing sexy things for one of her professors! Now Luna finds herself in the clutches of her creepy step-sister, else Lizzy rat her out to their parents! Embarrassment leads to humiliation, and then to an order she never thought she'd hear, even from her creepy step-sister!