As soon as the words were out of his mouth, Jon saw the stone begin to glow, brighter and brighter until he thought it might explode. When the light was too bright for him he closed his eyes and heard a loud "whoosh" noise as the stone released the energy it was building up and granted the wish.
He opened his eyes but was still temporarily blinded by the light so he couldn't see much. He could tell he was changing somehow but couldn't quite place the feeling he was experiencing. It didn't hurt, but he was feeling pretty uncomfortable and dizzy. He decided to sit and walked over to where his bed should be only to end up walking face first into a soft wall. Reaching up, he could barely feel the top, but it too was soft. Soon, the wall began to rise even higher until he was on his tiptoes and finally unable to reach it. Confused, he just sat down on the floor and waited for the changes to take place.
After several minutes of more odd sensations such as tugging, falling, and cramping Jon finally felt the changes stop. His vision was also returning and he carefully rose to his feet to check out what changes had happened to him. As he stood the first thing he noticed was his hair was now black and much longer, down to his waist. Second, he saw that he now had two perfectly round, quite large, preky breasts. Knowing where this was going, he felt between his legs and sure enough, he was now all woman. He was prepared for this, he knew there was a chance the wish would be taken to mean exactly what Karyn wished for but he was surprised when, while brushing his hair out of his face, he felt his ears were now pointy. He was further surprised when he backed into a wall felt something crumple behind him. When he turned his head, he saw that he had wings.
"What the..." Jon muttered to himself as he turned to head to a mirror to see what he was now and ran straight into a large shiny black column that wasn't there a minute ago. The column continued up to a pink surface, which he recognized but didn't believe until his now giant sister laid on her stomach to talk to him face to face.
"You're not even dressed yet? You need to hurry up, my friends will be here any minute"