Crossdresser

You have been with your "Girlfriend" Sarah for a year. (Male character) You have always had a feminine body, but Sarah has long been a lesbian and you've been her best friend for years. You both agreed to play at being together to get her cruel mother off her back about not having any boyfriends. One day you were over at her house and she left to talk to her mother and left her cheerleader uniform on her bed. For some reason you decided why not try it on? What could go wrong? *The Door opens..*