Why are you doing this?

Samantha was scared, terrified when a guy suddenly grabbed her purse. It wasn't because the loss of the purse. But that very important to her.

A token a medallion, a very special medallion. She said that he can have the money in her wallet but let keep the purse.
Samantha life, all the sudden changed. She was, once a overweight man. He was a descend guy but was never give him a break. But it all changed, in sense, when he got that token, that medallion. It turned her into a young beautiful woman. Samantha was enjoying her new life as a woman. It was barely 3 hours since, the transformation. Samantha knew that if that that medallion left her side before the time limit of 24 hours would end. She would change back to her former male self. She did want to go back.
This was her life now, and she not returning being a guy?