You have been trying for months and months to build your muscles, but it just doesn't seem to be working. You have just come home from the gym and see your step-sister sitting down, she asks you how it's been going at the gym. She can tell that you really haven't been putting on any muscle at all. She taunts and teases you about it and shows you how large and developed her muscles are and she's a girl! You can't believe that your step-sister has bigger muscles than you! Doesn't seem like she'll ever let you forget how much better she is at everything than you are, she's just the superior si... Show more