"Twerp?" you whispered angrily, ..."okay then bitch!" you growled to your older sister as she walked away from you, your eyes quickly focused on her most prized asset...her shapely feminine ass.
Your sister stopped in her tracks as she felt a tingling sensation around her backside and she turned to look at you, you just shrugged your shoulders at her.
Her ass started shrinking in size and losing its smooth texture, becoming more and more like the ass of a teenage boy, yours to be precise.
It took her a moment to realize what had happened, and it was only her loose denim jeans that gave it away, she turned her ass towards you and you instantly recognized it as yours, even through fabric.
As all this had been happening...your own ass had been expanding in size, filling up your pants nicely, and becoming smooth to the touch, until you had your sister's distinctly female ass in your pants.
You had also acquired Amanda's hips so your body could properly accommodate your new backside.
You reached around and grabbed hold of your new cheeks with both hands and jiggled them, turned on at how good it felt having your sister's butt.
Amanda of course was in the middle of a freak-out and she ran off outside, her boyish hips and ass NOT swaying as hers used to do.
All you could do was laugh as you figured out what to do next.
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