You find a blue dress and matching heels. Being an 18 year old man, you've never worn any female clothes before. Being curious, you quickly strip off and put on the clothes and stand in front of the mirror. The dress too small for you and the it barely covers your crotch. The heels are too small and you can barely fit your feet into them
Suddenly, you feel a weird sensation in your crotch. You look down and see your penis shrinking way until there is just a slit. You have a vagina. Then, you chest feels weird as two medium sized breasts poke out of your dress. Suddenly, your face becomes more slender and your brown hair grows and turns blond.
Then, you feel like everything's getting bigger. No, you're getting smaller. You shrink until you are a teen. You look as though you are 14 or 15. The dress is now long enough and goes down to your knees. The heels are good enough and it fits you well. You quickly pull off the dress and kick up the heels, hoping to reverse your self. It doesn't work.
Now standing in front of the mirror is a girl who recently became a teenager. She has long blond hair, very small breasts and no pubic hair.
Suddenly, you hear the front door open. You quickly pull the dress back on, but disregards the heels. "Chris, we're home!"
It's your parents and your younger 15 year old sister.