I like to get story that his old 13 years and his sister 11 years.
She wished that she had wee wee like him. He starts loving at her and she wished he had girl part like her.
They woke up to discover. She has wee wee and showed to her mother while her brother tried to hide his secret.
She started to be a boy. While her brother still hiding his secret. He start faced diffecult situation with his friend during normal boy activity. His boy started slowly change to have girl butt and small boobs. What he should do to reverse situation. He discovers magical store and witch able only to stop his body development more by wearing her panties.
What will happen when his sister/brother discovers his secret?
What happen when his mother know about it.
What will happen when his friend discover he is a girl.
