Just to repeat myself this story was borrowed from a wonderful story Shadowglove wrote. With her permission of course. Any hints of plagiarism beyond the idea are unintentional.

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The original is awesome if you like this pairing.

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Dean moved quickly packing their limited supplies back into the Impala's trunk. They needed to get out of this one horse town quickly. Preferably before his not so little brother woke up. He was afraid he wouldn't be able to stop him if he went all wolf man again.

He moved towards the bed. Everything else was in the car. Now it was time to try and get the sleeping giant buckled in tight so they could get the hell out of dodge.

As he wrapped his arms around his brother, Sam growled. Low and deep in his throat before his eyes fluttered open. He shifted on the bed before pushing Dean away. "The smell." Sam ground his teeth and pushed up until he was sitting on the bed. "I can smell her all over you."

"You need to calm down."

"She's mine. You don't touch her."

"I didn't touch her Sam. What the hell are you talking about? You don't even know her."

"Mine." The sound was barely human.

"Sam." Dean waited for his brother to look at him. "I did not touch her." He said the words slow and deliberate. Sam seemed to relax a bit. "We need to get away from here. Now."

"Yeah, okay let's go." Dean could tell he was still on edge but he was fighting like hell to control it. He waited as Sam followed him out to the car. Occasionally sniffing the air. Dean slipped off his jacket and tossed it in the trunk. Sam's super sensitive nose might still be able to smell it but at least it wouldn't be as strong.

As Dean eased the car into traffic he kept sneaking glances at his brother who was doing his best to slow his breathing. "You were only out for about 20 minutes. I think you're building up a tolerance."

"Dean I don't know what came over me." Sam sounded more like himself. His voice was riddled with guilt. "She was okay?"

Dean heard the pain in his brother's voice and something else. A longing he wasn't used to. "She was fine. Barely even shaken up." Dean smiled slightly at the memory of how calm she was. He was shaken from his thoughts by Sam's low growl. "I told you I didn't touch her."

"What about the spook?"

"Chloe's taking care of it."

Sam just growled at that. Not sure why he cared one way or the other. His skin was itching again. There was a burning in his chest. He turned and looked out the window. He tried to concentrate on the passing scenery. He needed something to take his mind off the random encounter.

"Hey why don't we head to Bobby's and regroup?" Sam heard the concerned tone in his brother's voice and hated that he was the cause. Always the problem. Making things much more difficult for everyone. He had just started to come around to Dean's thinking that maybe, just maybe he could use this curse for good.

But that was all before he had attacked some random stranger. Before his every thought was about her smell, how she felt, her eyes. God her eyes were haunting him. Every time he closed his eyes he saw them. Looking at him with fear and then desire. The fear he expected but the desire… That was something else. He tried to convince himself it was only his imagination. Trying to figure out why a sweet girl would be attracted to a beast like him.

It didn't matter. None of it mattered. He was never going to see her again. He couldn't take the chance.

"Fine. We hide out at Bobby's till after the full moon."

Dean stared at his brother, shocked at his attitude. Ever since Madison had infected him Dean had noticed little things. Obviously there were physical differences. His eye sight, hearing, sense of smell, speed and strength, all of these had increased as one would have expected. But there were little things Dean hadn't anticipated. Attitude was the first thing he noticed. Things that someone who didn't know him probably would never have seen.

Dean did. Dean noticed the way Sam used his fists more often. Of the way his menu orders changed from his silly salads to be replaced by rare burgers and bloody steaks. Normally this would have been something to celebrate but when you rolled it all into the other changes Dean worried. Well worried more than his usual amount.

Now this? In the last 48 hours everything had gone south. Sammy wasn't Sammy anymore. He was dark, dangerous, he was more like Dean. He frowned at that thought. He had spent his entire life trying to prevent exactly what had happened.

Now on top of all this there was a girl. Some cute, annoying blonde who had turned Sam into a savage beast.

There was no way this was going to end well.

They spent the next week at Bobby's looking for another job. Something they could hunt. Anything to keep from thinking about the fact that Sam was out of control. Self medicating with enough alcohol to take down a mountain lion. Normally Dean was a big fan of pushing down anything that could be considered an emotional discussion but not if it meant Sam was going to be needing a liver transplant. If that was even possible.

Two days ago Dean had started his own secret project. Something had happened in Smallville and Dean couldn't help but wonder what it had to do with Sam going all angry wolf. They had just started getting to the point where Sam wasn't a self hating masochist and now they were back to square one.

He wasn't sure what he was hoping to find. The truth was he had never been good at research. That was Sam's strength. It wasn't like he could ask him to help though. Sam could barely focus on anything beyond his own self pity. So Dean was stuck trying to figure this out on his own. Banging on the keys like a monkey and hoping for Shakespeare.

The problem was there was just so much stuff. Article after article of crazy crap that while interesting, offered no help to the riddle that was Sam's reaction to one random girl. He was frustrated and angry. It was his job to take care of Sam and right now he felt like a complete failure.

Flipping through the stories he had saved he noticed something. Cursing under his breath Dean felt like slapping himself. Every one of the articles was written by one Miss Chloe Sullivan. The source of all their problems might also be the answer to them.

He thought about contacting her. Thought about laying out their problem. She could obviously be of some value. Thinking about Sam's reaction to her though he knew that wouldn't be possible. She might be the answer but she was also the problem. He was going to have to figure this out by himself.

"Whacha looking at boy?"

Dean nearly jumped out of his seat. "You are like a geriatric ninja."

"Very Funny. Don't try and change the subject."

"Nothing. Just looking for a case." Bobby just stood there and crossed him arms. Glaring at the younger hunter. "I'm worried about Sam."

"He's been much more broody than usual. Thought maybe something happened on your last job."

"Something happened all right. Something weird," Dean turned toward Bobby and told him everything. From Sam attacking the strange blonde to her knowledge of the supernatural.

"I don't know what she is but Sam hasn't been the same since we left." Dean turned towards the computer and pulled up the Google search of her name. "Check out these creds."

Bobby whistled appreciatively. "Girl's been around the block."

"Yeah and she didn't even flinch when Sam attacked."

"So what are you looking for?"

"No freaking idea." Bobby saw the frustration and worry in Dean's eyes. He knew the elder Winchester felt it was his number one job to protect Sam.

Dean had found bits and pieces and legends and folklore that spoke about a wolf's mate. Some called it a true mate, others the beta and others spoke of two halves. Most of it was romantic crap but even as jaded as Dean was he had to admit there was a tiny part of him that wanted to believe. Believe in the possibility of there being something good to come out of Sam getting cursed. He felt stupid showing it to Bobby. The only man on the planet possibly more jaded than himself when it came to a happy ending. But he needed help and Dean was getting nowhere fast.

"Soul mate?" Dean wasn't surprised at the older man's reaction. It was a bit ridiculous. "That can't end well." Dean kept quiet as the older hunter pulled up a chair and cracked open a book.

"I'm not sure we should even say anything to him. He seems fine now that we're away from her. Maybe more emo." As much as Dean wanted Sam happy and okay he was by nature distrustful. Nothing good had ever happened to a Winchester that hadn't come with a steep price.

"Is anyone going to cook dinner?" Both men turned at the sound of Sam's voice just in time to watch him stomp out of the room. "Seriously I'm starving."

"There's a steak in the fridge, I guess I could toss that on the grill." Sam watched as his brother tried to hide whatever he had been looking at on the computer screen. Curious at anything Dean could be hiding from him he walked over and glanced over his brother's shoulder just in time to watch Dean try and minimize the page.

His eyes widened as he caught a glimpse of what it had been. "Stop wasting your time." His words were gruff. "I already looked into it."

Dean looked shocked although he shouldn't have been. Curse or no curse Sam was still Sam and he never met a question he didn't want to answer.

"Why didn't you say anything boy?" Bobby's tone was soft, curious.

"Say what? I think that girl I mauled was my soul mate?" He laughed dark and bitter. "Even if she was that doesn't mean I'm going to drag some civilian into this nightmare." Dean frowned at his brother's words.

"But if she can help…"

"Help? Help? Her scent nearly had me changing with no full moon in sight. I don't think we need that kind of help." Sam thought about the way he had pinned her. Like an animal in heat. The more he thought about it the more he was certain that if Dean hadn't tranquilized him he very well might have tried to force himself on her. Even now the thought of her sent had his pulse racing. "There is nothing that can help me."

Dean watched as Sam turned and left the room. His shoulders slumped in defeat. It was two days until the full moon. There was nothing they could do until after then. Dean had tried chaining Sam in the past but he always ended up hurting himself. If they had access to Bobby's panic room they certainly weren't going to risk having to half ass some sort of confinement.