"I am afraid that we will have to send you back to seventh grade," The teacher said.
John heard chuckles from the class behind him, but before he could react the room itself began to spin around him. He felt nauseous as his body began to ache and feel strange. His already changed body felt like it was being pushed inwards on itself with a terrible, wrenching feeling. He cried out and heard his already feminine voice rise in octaves. His clothes floated around him, feeling huge, and then he felt them shrinking on his body. John couldn't see any of these things, his eyes were scrunched shut from pain.
Then it stopped. John slowly opened his eyes and realized he was in a new place. It was a restroom with dark orange tiles. He was staring at a mirror, and when he looked into it he gasped. A young girl no older than 14 stared back at him. The girl had dark brown hair and eyes, a light dusting of freckles over her nose. She was pretty for her age, with a body just starting to fill out. Her clothes were simple and a little frumpy, as if she'd worn them to consciously cover the changes to her growing body.
"Wha...." he squeaked in his new voice. ....