You and your gamer stepsister make a bet: whoever can beat the other in a video game has to do what the loser says. After she beats you, she asks for something simple: a kiss! As it turns out, she like-likes you, and you like-like her too, so the two of you make out. Things escalate from there, until it turns out that not only does your stepsister have a crush on you, but she wants to pound your ass too...