Ever since you started dating your new cutesy college cheerleader girlfriend, your black-eyeliner-wearing, MCR-loving stepsister won't stop playing mean pranks on you! When you confront your spooky lil' tormentor, she finally admits her lifelong crush on you—and, as things start heating up between you two, this introverted gloomy gal is ready to experience a lot of *very naughty* firsts—as long as you promise to dump that stupid annoying cheerleader, and swear your sexual allegiance to stepsister and stepsister alone!