Jon looked out the window and saw Sarah, he pointed his index finger, glancing Karyn's way, he said, "Here goes. Give me that brain"
Jon heard Karyn start to say something, and then was cut off, suddenly Jon was in a different location altogether. He was in the street outside his house, looking around, he realized that he was now in Sarah's body, in the street! Looking down he could see her pale pink jogging clothes concealing a larger pair of breasts then he had with Zoe's body, concealed under the pink cotton fabric. Jon could feel his now long hair pulled up in a bun behind his head.
Looking back at his house, he saw Karyn arguing with someone at the front door of his house, the door flew open and out came Jon's former body. Jon heard part of the argument Karyn was having with what he assumed was Sarah.
"I don't know what you freaks were planning but if you come near me again I'm calling the cops!", Sarah yelled in Jon's voice storming down the front path to the house and down the street, looking indignant and dressed in Jon's clothes.
She huffed past Jon in her body, shoving him aside, "Get outta my way moron!" she growled. After a moment of muttering and watching Jon and Karyn carefully, Sarah turned around and resumed her jogging in Jon's body.
Karyn waved Jon over to the house, Jon jogged up to the front door, clearly aware of the soft jiggling of his DD cup breasts, Jon wondered if Karyn felt the same way when she moved around.
Arriving at the front door, Karyn asked, "Jon, what the hell happened? One second you were standing in the house, the next you were in the street and Sarah was in the house", Karyn said.
"Heh, yea, I think the swapping wish may be a little strange. We still swapped bodies but we swapped positions too", Jon replied, "that could be a problem I think", he added.
Karyn scowled at Jon, "Um, I think you forgot something", she said.
Jon looked at Karyn strangely, "What do you mean?"
"Well Jon, you still have your pussy, you were meant to give me back mine from Sarah!" she exclaimed.
Jon looked down, he saw Karyn still sporting his penis in her panties, "oops", was all he could think to say.
"Well at least you proved parts swaps can be done with your wish now", Karyn replied, "Now you're back to normal we can find someone to switch my breasts and hair with", she said firmly, "I'm convinced"
Jon realized that Karyn was talking about Sarah's body as if he'd always had it, then Jon realized that he hadn't told Karyn that he had swapped with Sarah, so as far as Karyn knew, Jon and Sarah just randomly switched places and Jon was a big-boobed blonde bombshell the whole time!