Hey, I have a great idea for a great Supergirl fanfic! It's called "SUPER FREAKY FRIDAYS". Here's the plot:

"When Kara discovers an ancient kryptonian device that allows her to switch bodies with someone once a week, things take a freaky turn as Kara decides that Alex, Cat, & Lucy need to learn exactly how hard it is to fly in Supergirl's boots. But what Kara doesn't expect is just how hard it is to be Alex Danvers DEO AGENT, Cat Grant QUEEN OF ALL MEDIA, or even Lucy Lane DAUGHTER OF GENERAL LANE!"

I love this idea, but I'm too busy with work to write it. So, if anyone want to pick this story up, just message me on this site. :)