Just An Average Trip to Equestria

Sunset was nothing short of petrified. Her heart was pounding in her chest. Her breaths were short and rapid. She was wearing a beautiful cyan gown that matched her eyes, and she had seen the tiara that she would soon have placed on her head behind her horn. It was surreal, and she had no idea how she would survive it. Tears began to run down her cheeks as she thought of all the horrible things she had done to people and ponies alike before Twilight had shown her another way of living life successfully.
Princess Sunset Shimmer, officially the worst princess, and the first to become an emotional wreck even before her coronation.
Oh. My. God. Shut. Up!

She was having another of her private battles with her demon. She bit her lip. What if it took over again?
Ooh, yes, I will take over. One day. One day. I just need a chance.
And how will you get that chance?
You. The human Twilight. Celestia. Luna. We all have a plan.
So Celestia, Luna, Twilight and I are all going to let you out. Really?!
Yes. Stop crying and compose yourself, you're about to be declared one of the most powerful creatures in Equestria.
Shut. Up. Please. I can't stand you any more.
When we get a chance, we WILL take over. All of us have something in common. We all have a Nightmare Pony or person, a demon who helps us when we are vulnerable. I am your demon. I can take over, but only when you are vulnerable, either in real life or emotionally. Remember when you put on your friend Princess Twilight's crown? The magic could have killed you. I made sure that didn't happen. I saved your life. You should thank me.
In your dreams.
We have the same dreams.
Ugh. Shush. Shut it.
No. I want you to listen.
"I said shut it!" she yelled.

Twilight's head turned to look at Sunset with a mix of confusion and worry.
"Nobody was talking, Sunset," she said.
"Ugh, it's little Demon Shimmer." Sunset's horn lit up and a cyan bubble appeared. Sunset's demon, in human form, appeared inside the bubble. Sunset used her magic to place her demon in an empty jar. She placed the lid on the top, and bound it. Only Sunset could get it out again.
"So Twilight," asked Sunset, "how do you do this whole coronation thing?"
Twilight took a deep breath before telling her friend, "You have to smile and let Princess Celestia place the crown on your head. Then there's the worst bit: the speech."
"Oh no. As a rule I don't do speeches. What do I say?"
"You are the Princess of Independence. When I was crowned, I spoke about my friends. If I were you, I would speak about life on Earth - is it Earth? I forgot - and how you had to learn quickly to survive there. Mention your battle with your demon. Also, talk a bit about friendship with the people there. That should be sufficient."
"You've stepped over the line. That's way too much."
"The speech only has to be a minute long. Just include what you feel like including."

A bugle sounded.
"Oh hell," said Sunset. She was not looking forward to this, not one bit. Twilight enjoyed the look of nervousness on her friend's face as she thought of her own coronation not long ago. She made her way into the hall and stood next to her brother. Then the grand doors at the other end of the hall opened and Sunset Shimmer slowly walked down the centre.