This is my take on what happened during Dean's 6 months as demon. This started out as PWP but...I liked the plot I came up with so you will have to deal with Porn with plot...

Crowley knew the risks. He had studied them meticulously; spent days contemplating the implications before putting his plan into action. The man was no ordinary man, hell he wasn't even an ordinary hunter. Dean Winchester had been trained to be the perfect soldier by a marine for 26 years-the perfect grunt for his daddy's revenge. On top of that, Dean was a vessel for an archangel. His body is able to withstand and control untold amounts of power.

Add the mark of Cain to that mix and you have an extremely deadly combination.

The prospect of which gave Crowley shivers down his spine. He had already seen the mark changing the squirrel. The hunter had stopped eating and was growing angrier at the simplest of things. He was changing and the mark was twisting the so-called righteous man's soul. Crowley was curious how it would translate.

Dean had merely looked around the room when he awoke. His blade clutched in his hand as his black eyes scanned slowly around the room. When he sat up he was able to turn to look at Crowley. His expression showed no emotion. Then Dean swung his legs off the bed and headed out of the room without acknowledging the king's presence. Crowley followed in silence.

Demons spend centuries in hell as their souls twisted and eroded from various tortures. He had no idea how Dean would react to the sudden change. Dean was heading out of the bunker at a quick pace-that much Crowley could tell. Crowley noted the keys that Sam had tossed on the table haphazardly when he had carried his dead brother into the bunker. The king grabbed the keys. It had hardly made a noise, but Dean had turned at it. His head tilted as if seeing the keys for the very first time and then he grabbed the keys from the King of Hell quickly heading into a new direction.

The demon was on a mission and Crowley was going to let him do what he needed to do. Dean did not object when Crowley got into the car with him. He didn't say a single word, he just shot out of the giant garage like a bat out of hell. It was a miracle they didn't get pulled over at the ridiculous speeds they were going, though Crowley would have enjoyed it. He would have been able to see his new demon in action. Crowley remained silent and stared straight ahead at the window.

Within a half hour Dean turned into a bar and quickly headed in without even looking back to see if Crowley was following him.

After a few hours Crowley had determined that howling at the moon consisted of large amounts of booze and giant piles of every flavor of hot wings. The king handed over a credit card to the bartender and gave the young male a wink. The bartender ignored him and went to run his card. It was a hefty tab but Crowley fully intended to keep his knight of hell as happy as can be. The power that Dean had to possess was more than worth it.

Crowley frowned and pulled out his cell phone. According to the text, Sam was on the move. He must have realized that the King of hell was not coming to save the day and found that his brother was gone. Crowley put the phone away and looked up to see Dean staring him down with those green eyes.

"We may need to move this party elsewhere," Crowley told him.

Dean rolled his eye and growled, "Can't even get a few hours before he ruins things, can I?"

Crowley suppressed the surprise he was feeling at the unadulterated hate that was emanating off of the demon. "I could pop us elsewhere…"

"Where?" Dean tossed back a shot with a grimace. "Hell?"

"You are not going to hell," Crowley frowned.

Dean raised a brow at the King.

"You may still have some of that 'righteous man' floating around in you somewhere," Crowley ignored Dean's snort. "If you draw any innocent blood then Lucifer is loose…again."

"Don't want to give up your precious throne?" Dean smirked.

"Want to give up your new freedom?" Crowley threw back the last of his whiskey and then stood. He looked to Dean who was still sitting and staring him down. Crowley waited patiently. Dean was not an idiot. He knew that the mark of Cain was a way that Lucifer controlled Cain. That it would make him satan's bitch if Lucifer ever managed to get loose. Crowley could also see Dean deciding if Crowley would hamper his freedom. He probably knew that as things currently stood, Crowley did not have a way to control Dean like Lucifer did. Though Crowley did not know if Dean realized how powerful he had become.

After a few moments Dean took a look around the bar, "Where to then?"

Crowley smirked already knowing the correct answer, "wherever you want, squirrel."

Smut starts soon. I hope you guys like this. I haven't found a lot of Dean/Crowley fics that I like...also if you guys know any good Crowly/Dean fics-please send me a link!