Twilight flinched and looked away.
"Well? Why aren't you answering me?! Do I have a bloody father or do I not!?!" Harmony was truly distressed now, because when her mom hesitated with an answer, she usually didn't want to say it. She gasped. "I don't..." Harmony trailed off, staring at nothing with a dazed expression.
"No, it's not like that! I... I found you. I woke up in the middle of the night ten years ago, and I found you in the middle of the library, holding a note and with the remnants of a teleportation spell around you. I'm sorry," Twilight was in tears now. "I'm so, so sorry."
Harmony slumped against the pony she thought was her mother, tears silently streaming down her face, still comprehending what Twilight had just said. "You're not my mother... You never were. You - you just - I -" Harmony couldn't find the words to express the betrayal that was inside her heart. She got up and left Twilight's side, a look of disgust upon her face.
"Wait, Harmony, I can -"
"NO YOU CAN'T! WHATEVER IT IS, YOU CAN'T," Harmony screamed. "YOU'LL NEVER UNDERSTAND WHAT IT'S LIKE TO BE BETRAYED AND LIED TO BY SOMEONE YOU THOUGHT WAS FAMILY! YOU'LL NEVER KNOW WHAT IT'S LIKE TO HAVE BEEN LIED TO ALL YOUR BLOODY LIFE!" Harmony began randomly teleporting all over the library. "Who am I, where am I from, who are my real parents, what do I do now?"
Twilight was openly sobbing now. She reached out to Harmony, who flew up out of reach. "I'm so so sorry Harmony, I didn't want you to find out like this..." She trailed into silence as she realized Harmony wasn't listening.
"I have to leave. Yes, that's it! I'll leave, and try to find my family!" Tears were still silently flowing down her face, unnoticed and ignored.
"No... Don't leave... You've always been my baby girl, please, Harmony!" Twilight knew that no matter how she grounded Harmony, how many spells she placed, Harmony would escape somehow. Better for her to be happy and find her real parents than be miserable under house arrest. "Please," she whispered.
But Harmony had already gone.
Harmony quickly packed all of her most valuable items in her saddlebags, snuck back downstairs to grab some food, and set out behind the library, leaving her adoptive mother weeping in her home.
She didn't know where she was going, nor did she remotely care. She just wanted to go... away. Of course, she was terrified, but she knew she would never be happy unless she did this. She may never be happy again, she didn't know. She just knew to keep flying, and to walk when she got tired. She followed no roads, flying above trees and rivers, until she knew she had to stop.
When she landed, she made sure to hide in a small grove of trees, away from the road. She went through her saddlebags, seeing what she had grabbed. She saw her secret stash of bits, a scarf, a hat, a... Black bowtie? She quickly grabbed this and put it on, simply for the sake of it. She also had a picture of her and Twilight. This, she stuffed into the bottom of her bag, moving on the the other side. She snagged an apple out, seeing several more in there, along with some water bottles and a book on survival spells. She crunched her apple, taking a few sips from a water bottle.
After about a fifteen minute break and reorganizing her saddlebags, distributing the weight evenly, she set off at a brisk trot, one that could be maintained for a long time. She went like this for an hour, using a road this time, and after another hour, she came to a crossroads with a sign planted there. She could go left, heading to Las Pegasus, or she could go right, heading to Fillydelphia. Knowing how she would blend in in Las Pegasus, but also knowing how pricey living spaces were, she decided to go to Fillydelphia. It was a risk, since she didn't know much about it, but she knew that she would ultimately be caught either way unless a miracle happened.
On the bright side, she thought. I have a longer journey this way. It'll be nice. She trotted along the country road for awhile, because there was no traffic. She knew that would change soon, and other ponies would question a young filly such has herself all alone on the road. Then again, what did she care? It's not like any prison or orphanage could hold her anyway.
She looke to the west, at the setting sun. She hadn't realized how late it was when she left. Deciding to head off the road, she found a small indention hidden by some bushes. Setting up camp here for the night, she made a bed out of leaves (as per survival guide), she ate another apple, had some more water, and went to sleep, the moon watching over her.
In the morning, she broke camp, clearing all evidence that she was there. Upon deciding to travel for an hour or so before eating another apple, she set off along the path. She saw a flock of birds fly out of the trees up ahead, and thought nothing of it. When she turned the corner however, she saw the strangest creatures.
They were tall, like upward sloping cones at the bottom with domed heads, and a weird antenna-like sticks with a blue light at the end of each. There were five of them, all looking at her. She took a step forward, and was rewarded with one of the many attachments on what looked like the leader poinded straight at her.
And it said, in a metallic voice, "-Exterminate-"