Other side of the paddock

My body twisted and changed. My rear grew and grew and sprouted fur. My torso thinned out in some places and begun to expand in others. In moments, I was a healthily proportioned female centaur. "I'm sorry Jon!" Karyn shouted, in her deep male voice, as she mounted me. "There's nothing I can do!" This was hardly an ideal situation. I needed to try and stop this as quickly as possible, but I couldn't think of any way to change the interpretation of Karyn's wish. There had to be some way, or we could be stuck as fucking centaurs forever! "Karyn! Can you fight it?" I asked, in hope. "No, it's no good, I have to do it, the wish is enforcing it! Can you make another wish to stop this!?" I had a thought and decided to risk making a wish. "Okay. I wish..."