You take out the flashlight and quickly flash her ass with it, expanding it several sizes. You then slap her on her new ass.
"Hey, at least you've got an amazing ass, that makes up for something, right?"
"Yeah, you're right. I've got a rocken ass, nobody can take that from me" you'd beg to differ, "thanks babe," she gives you a kiss and starts to run off to the restroom "I'm gonna pee before we go"
"Alright, don't get lost" you watch as her new ass sways heavily as she jaunts away and find yourself becoming slightly more of an ass man.
You contemplate your changes, and wonder what you should do next. You could expand your boobs some more and see what that would be like, or manly yourself up in other places