Notes: This is a complete AU. Angel!Cas, Human!Dean, no hunters. Angels and Demons are fighting their eternal fight and some of them have come down to earth to fight on among mankind. This is where it starts: Dean gets sucked into a battle that is absolutely not his own and once he has touched the angel, the human can't let go.

Don't Let Go

Chapter 1:

Finding Him

The Demon

It was highly uncommon for a demon to break through the gates of Hell and get to earth but this rare specimen of his race was cunning and clever, he knew his ways and tricks so it was easy for someone like Crowley to leave the depths of hell and the battlefields behind to go forth to earth where humans lived. They were so blissfully unaware of the war that was raging in Heaven and Hell, humankind never knew that each days thousands of holy and unholy creatures died in their eternal fight for dominance and Crowley loved it this way. It made him able to add a new depth to the fights and Heaven would love it! Ages ago the so called celestial creatures decided that their fight was not be fought on earth but Crowley thought that this was going to be lots of fun. And so he was the first demon since the dark middle ages – those have been great times! – to set his foot upon neutral ground.

With a smirk the second in command of hell stood on a skyscraper and looked down into the shining abyss that was called New York. Even in the middle of the night people and cars were bustling about like ants, unaware of the evil that stood on a rooftop, looking down at them without pity but with curiosity and lots of corrupting thoughts. Maybe the demon would be able to recruit humans to fight by his side, maybe he was able to plant a tiny seed from that would grow a new world wide war. It should be easy… the last two world wars haven't even needed a demon to start them. Crowley broke into an evil laugh when he thought about the nuclear, chemical and biological weapons that humanity had developed and how fast they would kill themselves with it. Stupid creatures. He didn't understand why God had created them and why the angels still tried to protect His creation. Maybe they were just as dumb.

While he was looking down to the streets Crowley thought about what he should do next. To be honest he hadn't considered that he would get to earth so quickly and without any occurrences. It had been easier than he thought and maybe this was a trap but he would watch out for sure. The most important thing, now that he was here was, to find a way to get humans involved into their fight. Maybe he should find the evil ones – it wouldn't be too hard, some of them gathered in what they called the "White House", "Kreml", "Bundestag", Downing Street" and whatever. So perhaps it would be even more funny if he found some righteous men to corrupt them. Recruiting those who already had a dark soul was a children's game, the real challenge was to gain the trust and loyalty of the good people. It would be more fun for him to see a good man fall and it would hurt Heaven even more to lose their dumb sheep.

When Crowley saw a human he could instantly tell if their soul tended to be good or bad, if they were easy targets for him or not. And as he was watching them from above he figured that it was really hard to find the truly good people. Those walking around in the streets had gloomy, dark thoughts, they weren't expecting too much of their lives, they knew that the world wasn't a good place. They gave up too fast. That meant that a good soul, that tried to see the best in humankind was precious. Destroying it would be a crime and a provoking act. If Crowley didn't already have the attention of Heaven for just wandering upon earth, he would certainly get it if he destroyed a good soul to drag it into darkness…

So Crowley made his decision to find a righteous man, to destroy him, to kill his hope and paint his soul black from the inside out. It would be so much fun! But the demon was sure that he wouldn't find a pure soul in a city like New York. Maybe he would find some good souls, some pious humans but in the end they wouldn't be the ones he was looking for. No, for the beginning he needed a soul that would mean a loss for Heaven, a soul that was good through and through. The human he was looking for wouldn't have to be a religious person. Even the bad people prayed to God, hoping for salvation that wouldn't come. Some truly good souls didn't even believe in God but it made no difference: good was good and bad was bad. Crowley knew that humans tried to avoid thinking in "black and white" and they tried to believe that there were some "gray areas", too, but there weren't. It really was that easy!

After a few hours of just watching the streets of the big city Crowley got up from where he was sitting and forced his outward appearance to match that of a raven, a simple bird that no one would look at twice. At least that was what people would see if they looked at him. In fact he rose to his true form, spreading his wings and taking off the building, gliding through the canyons of those huge houses and buildings. No, he wouldn't find his soul here. He flew higher into the sky, it got darker when the lights grew smaller and then he turned to the land that lay behind New York. The land that some humans had once called the "new world". It wasn't a new world. It had just been an untouched part of the old world but once people had set their foot upon it, it was doomed as well. Crowley sighed. Humans tended to destroy everything they found. Just like him… He needed to find someone who was the complete opposite and maybe he would find them deeper into the country.

It took Crowley six days and six nights to finally see the bright light of a pure soul on the horizon and finally on the seventh day he was close to the soul. The man that possessed this completely good soul lived in a small town in Kansas, he worked hard for a living and with the money he earned he helped his little brother who needed it for his education. The man was so righteous that Crowley nearly gagged when he looked at him closer. True good caused him physical pain, especially when it was as pure as the good within this man. Then he broke into laughter. How stupid to work for others, why did this man even care? But it would all be in vain because sooner or later Crowley would destroy him and his good attitude, he would make sure that not even a spark of this bright, sickening light was left in this man's soul.

Now, the righteous man was still unaware of the evil that loomed in the distance to get him but soon he would know what it meant to get corrupted!

The Angel

They had sent him to earth. It wasn't common for an angel to leave Heaven for another purpose than the fight and Castiel felt honored that he was chosen to be the one who should find and safe the righteous man. He hated the battlefields and he hated the fight between Heaven and Hell. It was senseless, they would go on for all eternity because there was a balance between good and evil that could hardly be destroyed by just killing each other. The battle was now raging on since the Fall of humanity, since the moment Adam accepted the apple from Lucifer. The seraph wasn't as old as time but he had seen the milennia and he knew nothing but fighting. So maybe here was the end to it. That was why he had accepted this mission so gladly when Michael had approached him a few days ago. "A demon went to earth." Michael had said to Castiel. "He is looking for a pure soul to corrupt for his evil deeds but what he will find isn't just a pure soul, Castiel, he will find the Righteous Man." At first Castiel hadn't understood what the archangel was telling him, so he had asked him what it meant. Michael's face was a dark mask, Castiel had never seen his superior so worried.

"Since the beginning of humankind there was a man in every generation with a soul so pure that he is called the Righteous Man. He is the only one who holds the balance between good and evil upright. If the demon finds him and destroys the last spark of goodness within him, the balance will falter and be destroyed. Evil will win the eternal fight and darkness will reign till the end of time. We cannot let this happen, seraph! Go to earth, find the Righteous man before the demon does. Protect him. Keep his pure soul from evil, Castiel." And so Castiel had left Heaven and the battlefields behind to set his foot upon earth for the first time in his life. It was so different from what he had imagined: people weren't just using the things God had given them, they had created new things, such as cars and something they called electricity. They could make their own light from nothing, they didn't need the sun and so a night on earth wasn't as dark as Castiel had suspected. It was strange to see those things, it felt wrong and it disturbed the angel but he had no time to adjust, he needed to find the Righteous Man before the demon would find him.

Castiel began his search in a huge town people called Los Angeles, he thought this was quite a good place to begin with since it was called like his kind. Certainly no truly good person was to be found in a huge city like this. Sure, good people existed but the Righteous man was nowhere to be found. So Castiel spread his wings and went on deeper into the country where he found a city called Las Vegas. He searched this city as well but soon he found that this was a place where most of the Seven Sins became alive. No good man would come here if he was in his right mind. Appalled the angel went on, searching in huge cities and small towns, trying to find the bright soul he was looking for. He knew that the man had to be found as fast as possible but it took him five days and six nights to find the Righteous man in a small town in Kansas.

The man was working hard for the money he lived on and he supported his brother with his wages. Castiel broke into a smile when he saw the beacon of light in the distance that told him that this was the person he was looking for. Yes, this man truly possessed a pure soul he was the least selfish being Castiel had ever seen and the passion that he held to help his brother was impressing even for an angel. As far as the seraph could tell there was no demon near this small town and so he landed on a building that was near the Righteous Man's house. It was early dawn and Castiel could see the man he was looking for from where he sat on the rooftop. He was still sleeping, a black cat curled up next to his shoulder, completely trusting her owner. The creature was right to trust him because the man she was sleeping next to was good through and through though he didn't really know it. He just tried his best and was unaware of the role he played in God's master plan. With a ruffle of feathers Castiel stood up and flew over to the house, reading the name that was written next to the doorbell. Dean Winchester. The angel whispered the name to himself and found it very pleasing to his tongue and fitting for the Righteous Man.

Carefully Castiel made sure that he looked human before he entered the house silently. With his wings hidden he wouldn't scare Dean and could explain that he was an angel and that he was here to protect Dean from every evil that could occur to him. The plan was easy and Castiel was sure that he would convince Dean within seconds and so he stepped into the bedroom of the man and stopped dead in his tracks. The man that lay in the soft cushions was even more beautiful than from a distance and his soul shined brightly, making Castiel wonder if it was even possible to destroy the goodness in it completely. He had never looked at a human that closely but he was sure that no other man matched the beauty of this specimen. His skin was perfectly tanned, his face shaped in fine lines as well as his body. He was a beautiful thing to look at and the angel found himself smiling. Yes, he would protect this human being, he wanted to be as close to the bright light of his soul as possible and so he stepped up closer to the bed, still staring at the sleeping man. The cat looked up at Castiel but as the angel wasn't a threat to her or her human she soon curled up again to go back to sleep.

As the sun slowly crept higher Castiel just stood next to the bed, still marveling at the sight before him. He didn't know if he should wake up the man but after what seemed like an eternity the decision was taken from him when something blared loudly next to him, making the angel jump and the Righteous Man wake up. Castiel glared at the thing with glowing digits from which the sounds came – most likely supposed to be music – but then he turned his attention back to the man in bed and was again speechless when he looked into the greenest eyes he had ever seen. They instantly reminded him of untouched forests, far away from civilization and they held an intelligence that was hard to place. But within seconds they turned huge when Dean's sleep clouded mind was able to process that a man was standing right next to his bed.

It took him only seconds to lurch himself at the angel and Castiel fell to the ground unceremoniously where he realized two things: the Righteous Man was stronger than he had expected and he slept completely naked.

TBC

A/N: Please have mercy on me as English isn't my first language.

Reviews are loved!