Write a first person fictional narrative where a teenage boy is kidnapped by a mad scientist and experimented on, the boy awakes to find that below his head he has the body of a well endowed woman surgically replacing his original. This turns out to be permanent and then he is placed in a cage with other individuals who have been subjected to similar treatment, such as a teenage girl who was surgically given a man's genitalia replacing her own. Include lots of dialogue and interesting plot developments.