This my first Fanfic that I've posted, I also haven't seen much of Supernatural so I've had help from a friend who is a major fan. I'm really interested to know what the SPN fans think of this so pleas R&R.

Disclaimer: None of the characters belong to me except Aaron

I stood looking at the dust of the creature I had just killed, it had known that I was different, that I was not exactly what I seemed to be, and I had needed to silence it. Right now, I needed the brothers to trust me. I kept my back to them but I could tell that they were both watching me with suspicion. I could feel the blood lust that had threatened to take me over slowly fade away as I took several deep breaths. I stood listening to the brothers as they helped each other up and made sure that their injuries were minimal. The older one spat blood onto the floor and the smell of it filled my nostrils, I felt the darkness inside me begin to grow again, my stomach growled with hunger.

Kill them now.

I instantly felt revulsion as the thought crossed my mind, "You're not like those others, Aaron," I told myself, but deep down I knew it was a lie.

Dean stood beside his little brother watching the man in the centre of the room warily. The man turned to them and without waiting for questions he motioned them toward the door, "We have to leave, now," he stated flatly, sheathing his sword and heading for the door. Dean just stood there staring daggers at him, Sam allowed a half smile to show through, and said what they were both thinking, "Look, no offence, and thanks for the help, but who are you and how do we know we can trust you?"

The man stared back at Dean, as he answered Sam, "My name's Aaron, I'm a hunter, and I just saved both of your lives."

After a moment's deliberation Dean and Sam introduced themselves and the three men left the cabin. As the three of them headed back through woods towards the car, Dean glanced over his shoulder at Aaron, who seemed to be hurrying unnecessarily, "How'd you know we were here?" he asked, almost casually.

Aaron, who had been lost in thought, took a moment to answer, "I didn't, I was hunting, right place, right time I guess."

Dean watched suspiciously for any sign that Aaron was lying, but there were none, but then again he didn't show many signs of anything, he seemed… closed off somehow.

Sam supported Dean as they headed back towards the car, Aaron followed behind trying to hurry them along.

"Keep moving," he growled, as Sam paused for a moment to catch his breath.

Dean turned towards him his eyes narrowing, "Why are you in such a hurry?"

Aaron stared back at him for a moment; his dark eyes hard and cold, "Don't you get it? They knew you were coming, they were trying to kill you."

"Really? I didn't notice," Dean replied sarcastically.

"There's something coming after you, something worse"

Sam looked up, "How do you know that?"

"I just do, are you gonna stand here all night discussing it or are you gonna get your asses outta here?"

Sam and Dean glanced at each other and Dean nodded, "Let's go," he said with a resigned sigh.

SPNSPNSPNSPNSPNSPNSPNSPNSPNSPNSPNSPNSPNSPN

When they reached the car Sam turned to Dean, "You want me to drive?"

Dean just looked at him, Sam nodded, "Right, you drive."

Dean turned to Aaron as Sam went around the car to the passenger side, "Thanks for the help and the warning," he stated, not sounding very thankful, and then turned to get into the car.

"Wait," Aaron took a step towards him and for a moment Dean thought he saw a look of uncertainty cross his features, but then it was gone, "Where's John?" he asked softly.

Sam drew in a sharp breath and Dean just stood looking at him for a moment, "How do you know our Dad?"

Aaron shook his head slightly, "I met him a couple times when I was kid, that's all, he knew my dad."

"He's dead," said Sam almost in a whisper.

'He's dead.' The words echoed in my head, and for a moment, I didn't understand them. Then the impact hit me, but I was careful not to let my emotions show on my face. Part of me felt anger at John, How dare he die before I had my chance, another part felt relief, relief that I wouldn't have to deal with him now, but somewhere deep inside myself I felt pain and grief at his passing.

He was weak. His sons are weak, kill them now.

I shoved the thought away; for now, I was in control. The brothers' emotions swirled around me; they were both still grieving in their own way, and it was clear from the intensity of the grief that John's death had occurred recently.

Aaron stared at Sam for a moment; his dark eyes revealing nothing then seemingly shook off their earlier conversation as though it had never happened, "Where are you going to go?" he questioned Dean, finally turning his eyes toward the older of the two.

Dean shrugged non-committaly, "If what you say is true and there is something coming after us, it's nothing new. We'll do what we always do, move on and stop at the next town that seems interesting."

Before he even finished speaking Aaron was shaking his head, "You won't get away from him that easy, he'll never stop hunting you."

"Then we'll kill him," Dean stated fiercely, but Sam interrupted, "him?"

Aaron ignored Sam and growled at Dean, "Don't be stupid, you can't kill him, he doesn't die."

Dean smirked, "In my experience, they always die; the trick is finding out how."

Aaron didn't argue against that he was too busy stopping himself from strangling Dean. Sam repeated his earlier question, "him? Who is he, what is he?"

Aaron's stare was boring into Dean, if looks could kill he would have been a little pile of ash, but when Sam spoke Aaron's eyes flicked to look at him and then he turned his head slowly reminding Dean uncomfortably of a predator locking onto its prey.

"His name is Kalex; he's a Malice Demon, and they feed on pain, suffering, hopelessness, anger, hatred: Everything you're afraid of, they know. But Kalex isn't just a normal Malice Demon - he's the worst of them. He wants you both dead, but first he'll make you relive every painful memory, again and again and again. Then, he'll find out what you care about most and he'll make you watch as he destroys it piece by piece. He will magnify every ounce of your suffering until the pain is unbearable, and then, when there's nothing left and you're nothing but a shell, then he'll kill you…slowly."

After Aaron had finished the description they all stood in silence for a moment, and then Sam asked softly, "Why does he want us?"

Before Aaron could answer an inhuman sound cut through the night, a hellish howling echoed around them.

"Hellhounds," Aaron hissed.

Dean turned back towards the car, "Shitshitshit! Sam, get in the car!"

Sam obeyed, opening the passenger-side door and throwing himself into the seat. Dean fumbled for the keys and then slid behind the wheel, as he did he glanced in the rear-vision mirror and saw five hellhounds come snarling out of the woods. He heard the back door of the car open and Aaron got in, Dean didn't protest, he didn't like the guy but he wasn't about to let him get torn apart by hellhounds.

Then the hounds were on them.

Two smashed headlong into the back of the car, a third snapping at the door on Sam's side; another one took a flying leap and landed skidding its claws along the roof of the Impala-making Dean cringe at the thought of the scratches on his baby. The fifth went for the open window where Aaron was sitting.

Aaron turned to face the snapping jaws, "Sarak Tay," he snarled, his eyes flashing from their usual dark brown to a startling white. The hellhound let out a low growl but immediately backed off from the attack, Aaron turned to the front again, his eyes resuming their normal colour, "drive!" he yelled at Dean, who had already started the car. Dean slammed his foot onto the accelerator and the Impala leaped forward, bucking off the remaining hounds.