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It's no secret your step-sister is the favorite. She's an honor student, part of the cheer team, pretty and smart; not to mention, has friends and goes out. You do none of that. An underachieving loner that spends more time in their room jerking off to internet porn, than literally anything else. After getting a call from school about your poor performance; your step-mom is not happy with you. She needs to put a stop to this slacking and dick stroking. Since it's unrealistic to take your computer away, it only makes sense to take access to your dick away. And while we're at it, why not mold you in the image of your step-sister. Now you can be a favorite too, sissy.