Rose Tyler grew up in a world where the first significant thing your soulmate would ever say to you was emblazoned on your wrist. It was not the first word, although sometimes it would be, but the first important thing they would say to you. It was a word that you would remember for the rest of your life.
When she had been able to read the words for the first time on, her left wrist instead of her right, where all of the other marks were written, she wondered. There was only a single word on her wrist.
A simple, declarative word, Run!
Her classmates had teased her about how simple the word was, about how generic and impossible it would be to find her soulmate because it was so common. That was the first time Mickey showed her both of his equally blank wrists. They had smiled and laughed over their common strangeness of their marks of lack thereof. They became inseparable after that day.
But something inside of her had always been tugged by those words; they made her want to try a little bit harder, to run a little faster, to get just a little farther. They pushed her to want better, and they told her that someday, somehow she would find her place in the stagnant world. And she would be running head long to meet it.
They were what had gotten her through Jimmy Stone, and what a mistake that had been. He had caught site of her wrist and had called out run. She though it must have been meant to be because every other person had been after him, in the frantic comparison of marks, but she had never said the words written on his wrist.
There had never been the feeling of rightness that her mother had described feeling when she was with her father.
When she had finally escaped, £800 in debt, a shattered heart, but an intact soul. She began to run once again, Jimmy had made her stand still and that was wrong, she was meant to be moving.
She was meant to be running.
So she ran, towards or away it didn't matter anymore, all she knew is that she had to run. She needed to get away from her stagnant world, with the dead end job, on the estate with her mother and her best friend/pseudo boyfriend.
It was that running that propelled her to a job at Heinrick's department store. It was there, in a store room full of shop dummies coming to life that a rough, calloused hand slipped into hers, and a deep voice with a Northern accent told her to run! That she knew she had finally found her soulmate.
It was in the form of a brooding, broken, Time Lord, with buzz-cut hair and a leather jacket that smelled of engine grease, and 800 someodd years older then her, but over time she felt herself begin to fall for him. He was her first Doctor and he always would be.
But she never told him about the mark, about the three letters on her wrist that spelled out the simple word that had defined her life, and now defined her relationship. She had asked him once if Time Lords had soulmates, and he had scoffed at her, telling her no that they had been above those things, but most species in the galaxy had some form of a "soulmate mark".
It was later, after a regeneration, and a Metacrisis that she learned he had lied. The words tattooed on that bodies wrist had been "There's me", and when she had said those words to him, after he had seen run on her wrist his heart has stuttered and had broken a little bit more. The universe had finally revealed the answer to the one mystery that had haunted him since he first woke up in this body, and had revealed it to be a cruel joke. Her Doctor told her it was because she was young, she was human, and she was still innocent that he could never have bared to go after her, he couldn't bring himself to taint something so precious with his own perceived filth.
There had been another thing that she had never told her first Doctor about. The day after their visit to Satellite Five she had awoken from a dream of pinstripes and hair, of beaches and heartbreak, to find the skin of left wrist beginning to darken. Underneath the word that defined their relationship was a longer another word began to form, although from the looks of it borderline run-on sentence then a single word. Each day it grew a little larger and a little less blurry, like a count down to something. What it could have been counting down to she didn't know. Until one day after Jack Harkness had come aboard and caught site of the second mark forming on her wrist.
He had laughed when he caught sight and upon seeing her bemused expression had explained, "You've got two soulmates sweetheart. The day you meet him or her the words will become clear. Odd that it's on you're left arm though."
Until the mystery day her countdown continued.
But it wasn't the countdown to what she had been expecting. Jack had been right about the part where she would meet her second soulmate, but he had been wrong that it would be a different person. He was the same man, but at the same time oh so very different.
She would remember the day that the words on her wrist became clear for the rest of her life because it was a day that was impossible to forget.
He had sent her home, and for a brief moment in time she had wondered if that was why she was developing the run-on sentence mark, because the Doctor was going to die?
Then she remembered what he had taught her, and she knew what she was going to do. She was going to save the man who was the reason she bore the word run on her wrist. She was going to run towards him instead of away from him.
She was going to save his life!
She had opened the heart of the Tardis, and for a brief moment became a goddess, she wiped the Daleks from time and space. She saved her beloved Captain, and with a broken heart she placed her curse on him for the good of the universe.
But the power was too much for her, and in an action that had been set in motion they had arrived on this place for the first time, he took the power from her and sacrificed his life for hers. When she had woken up on the floor of the console room she had been confused and disoriented. She had not truly understood what he had been trying to say, as he began to ramble.
When her beloved first Doctor had burst into golden light, the broken soldier who wore his pain on his face had started to heal became a new man. When her wrist began to burn and she had pulled back the sleeve of her hoodie in alarm, she finally understood as the words solidified, and formed.
He had changed and because of that the word on her wrist had changed, becoming multiple words. When a man with pretty boy looks and great hair emerged from the golden light her heart had broken because the man she had loved, the man who was her soulmate was gone.