Your step-mom was always jealous of the girls around you... she got furious every time you brought a girl home... Deep down that you, her own step-son, desired other girls instead of her increased her insecurities... insecurities as a step-mother, insecurities as a woman... That's why, the day she caught you with that girl after she arrived home from the business triip, she WENT CRAZY! Sad and dissapointed her mind played tricks on her... so she decided to go to the old sorcerer who years ago had promised her that he could make her body look much better... That's how your step-mother came back to your room... happy after taking the old sorcerer's potion since her boobs and ass immediately grew! but not everything was rosy... After a minutes the spell went wrong! and your step-mother's body began to grow uncontrollably... 10 feet, 20 feet, 40 feet! Now, giant, angry and VERY POWERFUL, your giant step-mommy blames you for this whole mess! and rest assured you're going to pay for it... especially when you let her down after she made you show her your tiny dick...