She will be anyone who you have been think of.

"Now for your transform, you will be any person that I've been think of all the time." you answered to your girlfriend.

"Oh wow, really, hun?" your girlfriend asked with a smile. "So, are you going to tell me who is the person you've been think of?"

"Why should I tell you?" you asked your girlfriend back as you chuckled.

"Well, duh... I'm your girlfriend and you're my boyfriend, not some stranger." your girlfriend explained. "Of course, you have to tell me your answer."

"Well, wait until you find out." you replied as you see your girlfriend's skin starts to shifted. Your girlfriend was right, the game is real. You continue to watch your girlfriend's transformation and she's going to be a person you've been think of.