You let her change herself and give her the card. She takes the card but to your surprise, she just tells your name. Nothing happens.
“- Hah, you can’t use the card as it’s not yours.”
Suddenly your roommate looks down about to cry but before she does she sees the information of her vanish from the card. She quickly says you name. Suddenly, your informormations appear on the card. You look at your roommate, worry that it transforms him into you but she's still the same except that she has a devilish look. She says :
"- You will see what it's like to be female !"
The gender information on the card changes and you become a girl. Your roommate continues changing you :
"- Your breast size is F-cup and you have long blonde hairs."
Your hairs change color and grow while your chest expand. You don't like this and try to get the card back but your roommate is way taller than you. He quickly changes himself back so he has the muscles to stop you. He then continues editing your ID :
"- You're tall and wears only lingerie."
Is he kidding you ? He makes you tall NOW ? You start growing. Your clothes starts to change. Wait... How an ID card can change clothes ? This card is too powerfull ! You need to take it back but your roommate do his last change :
"- Your first name is Katherine and your last name is Jones."
Jones ? Wait... That's your roommate's name ! Is he looking for a sister ? Your memories start to fade out. You close your eyes and when you open them again, you tell your roommate :
"- Hey darling, you look really nice today. How about we have fun ?"
You're now Katherine Jones but everybody calls you Kat. You're Mr. Jones' wife. You fell in love with him two years ago because he's charming, funny, muscled and has some great skills in sex ! You wonder though why he keeps a copy of your Identity Card. A really realistic copy wich seems to have a weird aura around it.