Dear Cassie,
Ever since I moved to Charleston Haven, you were my best friend beyond all compare. Never before had I expierienced such raw friendship in such a powerful way. I had thought I had known everything about friendship, being the royal descendant I am, but you taught me a few things I hadn't thought possible.
So before I go, here is my gift to you:
You told me everything about yourself, so as my last request ever since I found out about my liver cancer, I will tell you things about me.
My name is Twilight Krystal Sparkle. I am sixteen years old and attend Charleston Haven High. My best friend is Cassielynn Pinke.
But in another, nonhuman dimension....
My name is Twilight Sparkle. I am sixteen years old and attend my royal princess castle daily. My best friends are Fluttershy, Applejack, Pinkie Pie, Rainbow Dash, and Rarity. In this dimension, we are ponies.
Colorful, pastel ponies.
The star tattoo you see on my face is my pony version's cutie mark.
I regret I have never told you about being a pony, nor about me being a straight-out princess. But you wouldn't believe me.
Please, believe me.
If I didn't have a week left to live, I'd show you the portal. Show you my friends. It's sad, you know? I get to tell you goodbye, but not my pony friends.
When Fluttershyfinds out, she'll probably cry. She's really shy, and cries often. Rainbow Dash wouldn't cry, but perhaps feel really bad for always pranking me. Pinkie Pie's hair would flatten and she'd be depressed. Rarity would dramatically cry, just like she does when she doesn't get her way. Applejack might cry, but Applejack's a mystery.
Do you know what it's like to have a loved one die? They don't. They've never had their best friend die.
I wish I had enough time to go to Equestria again. I'm immortal there. I can't die. Here, in my human form, I can. And that's what happening with me, I'm dying right here in my bed without anyone to dish me food or give me drinks. Except you, Cassie. You always take care of me before you.
It's really sweet, and from the bottom of my heart, I thank you.
Thank you.
Thank you, Cassie, for being a great friend.
I love you.
-Twilight Sparkle