A thousand years ago, and Luna isn't Nightmare moon yet. But, how long will that last? What would it take to make her change her mind

Note, I've linked the pic to the place where I got it out of respect for the creator of this piece.
I'm also not really sure on what tags would fit this. I guess it will be an experience for everyone who reads it. This fic is also going to be massively edited in the future to make it better.