Disclaimer: I don't own Supernatural. Give it time though, give it time.

Thank you JuliaAurelia and Kyla for being faithful reviewers! I appreciate it!

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The cave was almost completely in shadow, the silence broken by the occasional muffled whimper.

"Sam?" Dean eyed the cave apprehensively; something was wrong. His gaze rested on a figure, back against the wall, beaten and bloody with his head bowed.

"Dean," the figure mumbled.

"Oh thank God," whispered Dean, hurrying over to his brother and kneeling down beside him.

"Stay away." The words were barely more than a whisper, but they rang loud and clear.

"What are you talking about Sam?" Dean reached up to try and remove the chains, but Sam flinched away.

"Don't touch me!" he snarled, "Just get away!" Now Dean was annoyed.

"Why would I do that?" Sam didn't answer; he just turned his face away even further from Dean's. Not sure how to read his silence, Dean went to try and remove the chains again, but to his astonishment, they fell away on their own. Dean scrambled back instinctively, now more certain than ever that something was not right.

"Sam," asked Dean slowly, "why did the chains just set you free?" Sam groaned, looking at his shaking hands.

"Cus," whispered Sam as though ashamed, "I've been waiting for you." Sam turned and looked Dean fully in the face and it took all Dean's strength not to recoil. Sam's eyes were almost completely black, the corners veined with red. In combination with the blood streaking down his face and the thirsty expression he wore, Dean almost didn't recognize the man standing before him.

"Dean, please," Sam pleaded, "Just leave me, and get out of here." Sam involuntarily stepped towards his brother. Dean stood his ground.

"I'm not leaving."

"You idiot!" Sam burst out so suddenly and fiercely that Dean stepped back. "You really don't understand how much danger you're in? You've got no idea what I'm capable of, the things I want to do…" he trailed off panting, his eyes glinting in the light. Dean said nothing.

Sam took another shaky step forward, limbs twitching, and his head leaning slightly to the side. His eyes widened when he heard Dean's heart picking up speed.

"Dean," he whispered again "I'm dangerous. Especially to you." He leaned his head slowly to the other side, his neck cracking as he did.

"Even now, I can hear your blood pumping through your veins. I can smell the blood," he paused, "and I smell fear. It's…" he stopped again and inhaled deeply. "Please, if you still care about me at all, you've got to kill me." This brought Dean back to speech.

"We've been through this before, Sam. I couldn't kill you then, and I can't do it now." Sam advanced, picking up speed,

"You have to kill me, before I kill you. I can't control it! I'm thirsty all the time, you have no idea." Dean backed away from him and then stopped. Sam was only a few feet away.

"Can't I just make you a cranberry milkshake instead?" Sam didn't smile. "You're not a murderer Sam. I know that."

"You don't know me." Before Dean could answer, Sam punched him in the face, knocking him off his feet.

Dean got back to his feet, but only seconds later, Sam punched him again. Again and again, but Dean wouldn't raise a hand to defend himself. Sam punched and kicked, growing more ferocious with every swing. Finally, Dean fell to the ground, clutching his broken ribs.

"I tried to warn you Dean," panted Sam miserably, "I told you to get out while you still could." He dropped to his knees and pulled the knife out of Dean's jacket. Dean's eyes widened in shock, but he didn't move. Sam rolled up Dean's sleeve and drew the knife across his skin, almost experimentally. As the scent of Dean's blood rushing to the surface, reached Sam, his eyes turned completely black, the sound of pulsing pounding maddeningly in his ears, blocking out all rational thought. Slowly, Sam lowered his lips to Dean's arm and began to drink.

Dean stayed still, letting his brother drink. He couldn't move anyway, because Sam had him pinned, but he was frozen in denial. This was not his brother. His brother was the six-foot infinity, shaggy haired geek who needed his big brother around. His brother was not a monster. As if Sam could hear his thoughts, he drew away. Sam looked into Dean's eyes, hoping to see something that would make him stop. But all he saw was meat. Ignoring the look of betrayal in Dean's eyes, Sam took the knife and drew it cleanly across Dean's throat. The sound of Dean's choking was like music to his ears. He wanted more, more.

Sam took a final gulp and smiled. The pounding in his ears was gone. But it was replaced by the sound of a girl laughing.

"Every single time," she seemed to say. Sam froze. Standing up and swaying drunkenly on the spot, Sam stumbled to a puddle of water on the cave floor and stared at his reflection. He bit back a scream when he saw his demonic eyes and his face, streaked with blood- his brother's blood. Sam stomach contracted horribly and he slashed desperately at his reflection. As he attacked his image, the black receded to hazel, and with that, memories began to return. He turned slowly on the spot, hoping that he was dreaming, praying that he hadn't-

Dean's body lay spread-eagled on the dirty stone floor, dried blood mingling with dirt, his eyes still wide with disbelief.

"Oh God…" Sam dropped to his knees, hands gripping his hair, "No, no, no," whispering this to himself, over and over again, Sam crawled to his brother's body, taking in the knife wounds, the slit throat, the red blood that coated his hands. Sam clenched his eyes shut, hoping again that when he opened them, this would all have turned out to be a nightmare. He opened them. Dean was still dead. Dean, the cocky, porn-loving man who had endured so much, was now lying in the dirt. Tears began to fall, searing his face, but he didn't care. And he made no attempt to stop them. All he knew in that moment was that he himself, had taken the life of the one person who had always been there for him, stuck by him, sacrificed everything for him.

Very gently, as though handling a delicate antique, Sam put his hand under the base of Dean's neck and pulled him up. Other hand shaking, Sam closed Dean's glassy eyes. Then he wrapped his arms around his brother, cradling him to his chest and sobbed.

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TBC

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