This story is part of my request series All About Harry, do you want to make a request? Look at my bio page for info.

This is a Harry Potter, Supernatural Crossover by Kefalion

In this story Harry is a Powerful Demon. He became one after many years in Hell, where he ended up after dragging Voldemort there as he was unable to kill the Dark Lord. The thing is that Wizards normally don't become demons and the question is what Harry really has become, if it can be undone and if he wants that to happen.

Pairings are undecided, though there will be a side of Ron/Hermione in passing and mentions of past Harry/Ginny.

There will be some rather horrible things written here, we're dealing with demons people, be warned, they have no virtues and thrive on anything "bad"!

And of course I don't own Supernatural, Harry Potter or anything else you might recognize.

Wizards and Demons Don't Mix

Chapter 1
Words: 4 669

It was pure chaos. Things were had been going down so fast that it was hard to understand it all. Sam abducted by the demon. The Road House burnt down. Dean getting to his brother only for Sam to die in his arms. Dean making a deal to bring him back. Them trying to track down the demon and finding the giant Devil's Trap made by Samuel Colt.

And here they were. Jake - one of the children chosen by Yellow Eyes - lay dead on the ground and the Devil's Gate that Samuel Colt had locked was wide open, tormented souls and demons pouring out in a thick, seemingly never-ending stream.

With an unnatural wind flowing around them and thunder rolling in the dark clouds above the four hunters got up from their positions in cover and hurried to the Gate, knowing that they had to close it as soon as possible. But Dean was thinking. He had the Colt, having taken it from Jake and it could only have ended up there because the Yellow-Eyed demon gave it to him and just as he was cocking the gun, the demon in question showed up.

"A boy shouldn't play with daddy's guns," he said with a crooked smile and with a simple look he sent Dean flying through the air. He hit his head on the edge of a tombstone as he fell back to the ground. He groaned in pain, feeling the blood trickle down the side of his face.

At the same time Sam, Ellen and Bobby were pushing at the doors, trying to close the gate, but it went slow. Too slow. More and more demons in their true forms were flowing past. And when Sam saw what was going on with Dean, his priorities changed. He moved to help his brother, leaving Ellen alone to struggle with her part of the gate, losing momentum as the power was divided by more than half.

Yellow-Eyes saw him and with a small hand gesture he had Sam pinned against a tree, unable to move. "I'll get to you in a minute, champ," he called, enjoying himself immensely. "Well, I'm proud of you, knew you had it in ya."

Bobby and Ellen were half following what was going on behind them, but knew that they had to focus on their task. "Come on," Bobby muttered, trying to push harder. He groaned as he used every bit of strength he had.

"Bobby..!" Ellen gasped and they both made huge eyes as something corporeal walked past them. It looked to be a young man; tall, dark and handsome with a black cloak billowing out behind him. He smiled at them, his eyes flashing green, showing them that he was a demon, though not one of a classification Bobby nor Ellen had ever seen before.

"Just a moment longer," he said calmly, giving them a deceptively kind smile, "then I'll close it for you."

Bobby shared another look with Ellen, and they kept pushing, ignoring the demon for now, they had their task to focus on.

"Azazel!" the Green-Eyed demon called.

The Yellow-Eyed man, apparently known as Azazel, looked away from Dean. "Harry," he said, "what a pleasant surprise." He didn't sound all that pleased however, if Dean was to be any judge he'd say that the demon was scared and if that wasn't a refreshing look for him, Dean was a pixie. "I didn't think I'd see you here."

"Well, I heard about the plan to open the Gate," Harry said as calmly as if they were only discussing the weather over a cup of coffee. "And I heard about it just as I'd just made a friend and so I decided to stick around long enough to help him on his way."

"What? A friend? You're mocking me."

The dark-haired male smirked. "Why, yes I am, how good of you to notice. Wasn't it what you said to a young Tom Riddle?" Here he changed his voice, sounding eerily like the voice of Yellow-Eye's possessed body. "You're special Tom, and it's not right that you should be alone and scared. I can help you. I can make you powerful. I can be your friend. You just have to do a little something for me first."

"You found out about that, huh?"

The new demon hummed, walking a bit closer. "Yes. It's amazing how easy it is to get information when you're me. You know what I was and a bit about what I've become. I'm sure and you are right to fear me, especially since I killed Tom, permanently, before coming here and now I know who to really blame."

"Harry, son, don't be like that..."

"Oh, I've only begun. And you don't get to call me son. But I digress. You see this friend I was talking about; he's a mutual acquaintance and he's just been dying to see you. Ah, here he comes."

The new demon, Harry, made a minuscule gesture with his hand, and the Gate slammed shut as if pushed by a strong gush of wind, leaving Bobby and Ellen slumped by it as they were taken aback by the sudden change.

"Who?" Azazel asked.

The other demon just raised an eyebrow.

The four hunters gaped as the shape of John Winchester walked up behind the Yellow-Eyed demon and drew him out of his body, struggling with the black cloud that was the demon's true shape. The green-eyed-demon looked on calmly, a small smirk turning up the corner of his mouth.

"Nice one John," he said conversationally, "too bad you can't be the one to kill him, but at least the honour will go to one of your boys, and you get to see it happen, should help you be at rest and all that jazz."

Dean was getting up from the ground, able to move now that Yellow-Eyes was otherwise occupied and he made the Colt ready, seeing as the demon was breaking free of John.

"Sorry, Dean, not yet," Harry said and Dean found again that he couldn't move, making him want to scream with frustration and having to settle with a mental exclamation.

Azazel broke free and John's spectral form lay on the ground, tired from the spat. The Dark Cloud flew back into the host body and yellow eyes blinked open.

"Harry," he said, pushing himself up on his elbows, "we can talk about this. You shouldn't let them kill me."

"Hmm. I'll think about it." He turned his head. "Ah-ah, Sam. No interruptions, the adults are talking," he scolded gently, in a disturbing parody of a disapproving parent. Sam had been moving, walking to get to his brother and now he was frozen, unable to do more than blink.

"So, Azazel, you've done your job rather well."

"What do you know about it?"

"I thought I already told you. When you're me the rules don't apply and frankly everyone's been very eager to try and please me, giving me any information I could possible want. So I know about everything there is to know about the plan and I can't say that I am a huge fan, so I think I'll stop it."

"You can't do that!"

"I can and I will."

Azazel laughed. "Just as you stopped Tom Riddle?"

"Haven't you been listening?" the Green-Eyed demon was growling now, his friendly demeanour gone. "I killed him. Really killed him. He has been obliterated. He wasn't the first demon I tried my new power on I might add and unlike when I dragged him to Hell I have nothing to lose this time as you've so graciously already torn my humanity from me, father dearest."

"Harry, Harry, you're too young, you don't understand yet."

"I will have to disagree with you on that. I'm plenty old enough. I lived through Hell for an uncountable number of years without losing myself and it's been many more years since then. Long enough I'd say to learn what I need to form an opinion and I have no wish for Earth to become a second Hell. I'm different, you know that, and I have hope that I might regain what you took from me."

The Yellow-Eyed demon laughed outright now. "Do you truly think that? Do you think you can change what you've become?"

"It's our choices that determine who we are."

"You are quoting that old fool Dumbledore? How you amuse me."

Harry sneered. "I might not end up wanting my humanity back, but I do want the choice, which means that Earth shall stay its own brand of Hell." He took a few steps towards Azazel, standing over him. "Nothing like me has ever existed before, not in the many thousand years this world has existed."

"Tom-"

"Tom was only a shadow, a small quivering shard of soul. You cannot compare us." He mock-sighed. "I find myself growing weary of you. I've thought enough and the answer is no. I would kill you myself, it's nothing less than I want to, and nothing less than you deserve, but I promised that the right to end your existence belonged to the Winchester family."

Yellow-Eyes sneered. "What makes you think they won't kill you too?"

"For one, they've only got one bullet left, and I'd stake the world on that it has your name on it. Good bye, Azazel. Dean, go ahead."

Dean blinked and noticed that he could move again. He looked at Sam and his dad who had gotten up while the two demons conversed. The man gave him a minuscule nod, it was all he needed. He nodded back and lined up the gun, pulling the trigger. The bullet flew true, entering the demon responsible for destroying their family, right in the heart of the host's body. Orange flames lit up the body from within, spasms shaking the arms and legs, lightning and smoke erupting from the flesh, before the body became limp, the yellow over the eyes fading away, leaving dull, dead blue irises behind.

"Well, that was fun," the remaining demon said, his green eyes dulling until they looked normal, though the irises were still a bright green colour. "So shall we talk peacefully or do I need to keep you all immobilized?"

"If I had another bullet," Dean muttered, glaring hard.

Harry smirked. "Like father, like son I see. I understand why you're proud, John."

John moved so that he was standing next to the demon, giving him a look.

"Indeed. We'll you're right. I'll let you have a moment alone then. No, John, you can't hang around to make sure I won't hurt them, you have to crossover or you'll get stuck and someone will have to kill you. You'll just have to trust me. Yeah, yeah."

As the hunters looked on John seemed to have a silent conversation with the demon, or well, silent on his side.

"Good. I'll see you around then."

John shook his head.

"Ah, do give me some credit! I might make my way there yet."

John shook his head again, but he was smiling.

"Fine, fine! I'll go stand over there by the Gate. Colt really was a fine craftsman and having a look can't hurt, might need to build one or two of these myself. Good luck, John and thank you." They shared a nod and the demon moved away, Bobby and Ellen watching him warily as he moved in between them, humming under his breath as he peered at the lock on the gate, ignoring them completely.

Dean was a bit torn, feeling uncomfortable with the unknown demon there, but with the shape of his father standing before them he couldn't act on the unease, feeling that he needed to take this time to say goodbye one last time whether it was actually his dad or not.

He looked at John who gave him a tear filled smile, walking up to him and placing his hand on his shoulder. The touch was solid and warm, comfort filling him up, just as he could remember from when he was younger and his dad had been there for him in between hunts.

Sam, who was also free to move, joined them. John placed his other hand on Sam's shoulder giving him a smile too and a nod of confirmation.

The brothers couldn't hear him, but they could feel his words. I'm proud of you. Both of you. John backed away from them, smiling gently. His shape began to glow white and after a few flickers it dissolved into pale smoke and he was gone.

"Was that really? Could- is it possible that he could have climbed out of Hell?" Sam asked, awe colouring his words.

"If anyone was stubborn enough to do it, it was him," Dean answered. "Now though, we have ourselves a new problem at hand."

"Oh, are you talking about me?" the new demon turned away from the gate and smiled at them, showing a bit too much teeth. "So, I know who you all are, so it'd only be polite to introduce myself. I do still have some manners after all, at least I think so. I'm Harry, formerly Harry Potter, but a demon called Potter isn't very classy, so I dropped it. I think it's more appropriate to just go with a name which means master of the home, or the one I am beginning to prefer; if you think of it as coming from Harold, which comes from Hareweald, which means leader of the army. Much more fitting name for a demon than Potter, don't you think?"

"I think you talk too much," Bobby muttered.

"Well, I've not had many people to talk to for about a thousand years, give or take a decade so I've got a lot of catching up to do. Let me tell you, demons don't make the best conversationalist, it's all rage and hate and pain with them. It was nice when John came along, though it didn't start out too well as I was assigned to torture him."

"You were what?" Dean spat.

"Relax, Dean-o, daddy's okay now and I didn't hurt him too bad. I ended up liking to talk to him too much for that, and I helped him get away so I think we're pretty much even." He sighed again. "And to think that while for me it's been an eternity, here it's only as been about eight years since I went to Hell, funny thing time. If I'd gotten to live in peace I'd actually be twenty-seven, married with a few kids most likely, I suppose it was not to be. Now then, do any of you have holy water, salt or iron at hand?"

"Why are you asking?" Sam said watching Harry closely.

"I'm curious just as to how much of a demon I truly am. So, do you have any? Or maybe some chalk, we could try out a Devil's Trap. I would allow you to try an exorcism too if I had the time, alas I don't fancy going down stairs again should it work, will just cost me unnecessary time."

"And how is that a bad thing for us?" Dean asked. The four hunters were closing in on the demon, who appeared to be just as relaxed and cheerful as he'd been ever since he walked out of the Gate.

"Well you see, at the moment our goals are aligned. You want to stop the apocalypse, I want to stop the apocalypse and I will do so by killing every single demon that escaped today. Now holy water, I want to know how bad it is. Mr. Singer, there's a bottle hiding in your belt, is there not?"

The older hunter looked at his three companions, and rather reluctantly he brought out a small silvery bottle.

"If it makes you feel better you can just throw it at me."

"What's that about the apocalypse?" Bobby asked, gripping the flask tightly.

"Ah, yes, you wouldn't know the whole thing, would you? And with me here you don't need to know really. Just exorcise or kill any demons you come across, with two exceptions. Me and a demon named Lilith who likes to possess young girls, 'kay? Now holy water."

"What's with not killing the two of you?" Ellen asked.

"Mrs. Harvelle," Harry said giving her a charming smile, though it only made her shudder with unease, "killing us would bring on the apocalypse. Killing Lilith will literally start the whole thing, killing me will not start it per se, but it will make it come faster as you would be removing an ally. Now enough chatter, I want to know how much of myself I managed to keep."

The four hunters stared at the demon. They didn't know what to think.

"Oh, for crying out loud! Shouldn't you jump at an opportunity to hurt a demon?" he said exasperated, making overly large hand-gestures.

"Fine, if you want pain, I'll oblige," Bobby muttered at last, uncorking the bottle and splashing water towards Harry. The liquid hit his face and began to sizzle upon contact with his skin, though not as much as it would usually do. The demon's breathing got a bit laboured. Dean and Sam shared worried looks, it didn't appear as if the demon was in horrible pain and they didn't know if it was bad or good. Bad felt more likely.

"So, how did I do?" he asked once it calmed down. "It itched rather badly, though I wouldn't say that it hurt."

"It's supposed to burn like acid," Bobby answered.

"So does that mean he isn't a complete demon?" Sam hazarded to ask.

"No, it just means something we already knew. He isn't a Black or Red- Eyes. He's higher up at the Tier. The eyes indicate how powerful they are. Black are the lowest, then we have red. Those are the normal ones. Yellow is unusual, I know there have been sightings of white eyed ones or ones with multicolour. Green I've never heard of."

"Okay, so what it means?" Dean grunted.

"That it's bad we don't have the Colt anymore."

"Damn," Harry muttered. "I'm hurt. I suppose I'll have to come up with something else then…"

"What is it that you want?" Dean asked sharply, stopping the rambling that was surely about to happen.

"What I want? I want to go back in time and think up another way to stop a war than to throw myself into Hell to drag the leader of the opposite side with me. Or maybe go back far enough to kill Azazel long before he started experimenting on innocent kids. That's not in my power though so I will settle for cleaning up the mess he left."

"Kids?" Sam asked, picking up on that.

"You know you weren't the first generation, dear Sam. The man who ruined my life was one of the first Azazel experimented on, and the only one of his kind. Poor Tom Riddle. I hate him, it's become my nature, and I would were I still fully human, but at the same time I feel something else. Perhaps it's pity. I can't really tell. Hate and self-preservation is about the only things a demon can feel well. That I can sense something more…" He shook his head and went back to smiling. "Anyway, little Tommy was an orphan boy in the late nineteen-twenties. All alone he was an easy prey for Azazel. He'd tried to use normal kids, and so far it hadn't worked. Wanting to break the limits he went after a wizard."

"Wizard?" Sam was the one to ask.

"Yes, wizard." He looked at Bobby and Ellen. "Don't the two of you know about it? I know the Winchesters are clueless, same as their dad, but surely you must know?"

"Harry Potter?" Ellen muttered, as if she just remembered something.

"Ah!" Harry smiled. "You have heard! To think that I would have hated that before, but it makes things so much easier. Do tell them all you know, madam. Go on!"

"Ellen?" Dean questioned.

"Is that your original body?" the woman asked of the demon.

"Oh, I like you," he said, "you've been paying attention! Yes, this is my body, haven't needed to snatch a new one so far."

"The scar?"

He smiled and pulled up his fringe. On his pale forehead a scar stood out, pale red and in the shape of a lightning bolt.

"So you are him."

"In the flesh, not as much the soul anymore."

"Ellen, tell us what's going on," Dean demanded.

"There are the witches you know, the ones who sells their souls, then there is a different kind, or so it's said. They are born with their powers. The males are called wizards, the female witches, and if you are to call their entire kind something, they would be wizards."

"Good, very good," the demon said encouragingly.

"The live in separate societies; rarely venturing beyond them. And... And demons stay away from them."

"Anything else to add?"

"From what I've heard, there was a war in England."

"Go on, madam, do go on."

"It ended back in '99 when the leader was killed by Harry Potter, who disappeared."

The three men looked from Ellen to the demon whose eyes were glowing green again.

"Not so much killed, not then anyway," he said shrugging nonchalantly. "Though perhaps going to hell can be called dead."

"You?" Dean asked sceptically. "You stopped a war by going to Hell?"

"Don't sound so surprised. You should know about being willing to do anything to keep the people you love safe," he said pointedly.

Dean clenched his jaw. It was an unpleasant reminder of what he'd done only a day earlier to keep Sam alive and he didn't like the idea that he might turn out like the man before him.

"Why do demons stay away from wizards?"

"Wizards are human, yet not. They are improved in a sense. I know only a little, it happened a very long time ago and since most of my sources don't get involved… You'd have to get hold of an angel to really understand this."

"Whoah, angel?" Dean exclaimed.

"Buggersome creatures they are," Harry nodded. "Only met a handful, didn't much care for them, really stuck up and they can't think for themselves."

"Angels? Like God's messengers, with feathery wings, angels?"

"Oh, yes. Though I've not seen their true forms, it's supposed to be bad for you. Moving on now. Wizards were supposedly given their magical powers by God and this was after Lucifer had already gone bad."

"The Devil?" Sam asked.

"That would be the one, the fallen Morning Star. He tried to make me fall in line; I told him I wasn't interested, good thing for me that he was unable to step out of his prison."

"No, no, no," Dean interrupted. "You, you're telling us that God, angels and the damn Devil himself are real?"

"Yep," he popped on the p. "The Apocalypse, capital A, didn't tell you that? I feel sorry for you. No wait, I can't feel such emotions. Damn. So anyway; wizards. They got magic from God and since demons already existed so did the possibility of a human soul becoming one, and with the magic in these new souls that would be profoundly bad, therefore a sort of failsafe was instilled making it impossible for wizards to go to Hell. Instead a separate realm, a sort of purgatory, was created where sins would be cleansed away. Ergo no wizards have ever gone to Hell and a wizard has never become a demon. Until now."

"You?" Bobby asked.

"Me. If you hadn't figured it out yet, boys, I was a wizard. But there seem to have been more fail safes in place, I've been told that no one has taken longer to break than I did, and I'm not sure I did completely as I can still remember everything from my human life so well. Most don't, you know."

"Why are you even bothering with talking to us?" Sam asked now.

"John. I owe him rather a bit and talking to you giving you some information is how I'm planning on repaying him. So let's retrace. Kill any demon you come across, or send them back downstairs if that's all you can manage, unless it's me or Lilith. She's got white eyes so be careful, she won't be easy to deal with. I'll take care of the rest and if you need me use this." Harry took up something from a pocket and tossed it to Sam who caught it on instinct.

He closed his eyes tightly, expecting it to go boom. When nothing happened he looked down into his hands, seeing that he was holding a polished stick that was slightly scorched.

"That would be my wand. I don't need it anymore, but it's still connected to me so if you need me just hold that thing and think of me and I'll know. Oh and I'd actually suggest that if you happen upon a demon that you use that. I can kill them after all, it's nice knowing they won't be coming back, am I right? Was there anything else? Ah, yes." Harry walked up to Dean who flinched, dodging the hand that the demon stretched out. He sighed. "I'm just going to heal you."

"No thanks."

"Did I say it was optional? Didn't think so. Stand still or I'll make you."

"Make me."

Harry rolled his eyes. Next moment Dean felt his temple where he had hit his head starting to itch, it felt warm and then it stopped. He looked suspiciously at the demon

"No need to thank me," he said with a smirk. "Take that as a small proof of my good will." He looked to the sky. "I've tarried long enough, time to get going; I've got myself some demons to hunt, though…" he hummed quietly. "It can wait for a little bit. I really should head to England first. Any questions before I go?"

The hunters stared at the demon with the Glowing Green Eyes.

"No? Maybe you'll think up some later. I'm sure I'll see you around. Now if you don't mind I've got to find my Teddy-Bear." With those cheerful words the demon turned on his heel and so he was gone with just a small crack.

"What the Fucking Hell was that?" Dean asked, staring at the place where Harry disappeared.

"By far the strangest demon, ever," Sam muttered.

"And possibly the most dangerous," Ellen said. "At one point I think he was a good person, but I don't think we can trust him."

"Of course we can't," Bobby said gruffly. "It's a demon. You shouldn't use that wand, Sam."

"I wasn't planning to. So what now?"

"Now we get out of here. That Harry-demon was right about one thing," Bobby said. "We have a lot of demons to get rid of. And I have a few things I want to research."

"Yeah," Sam said in agreement. "How much of what he said do you reckon was true?"

"I don't know," Dean grumbled, "but the less, the better."

"On that we can agree." Sam looked at the body of the Yellow-Eyed demon. "I can't believe it's over. It seems that he ruined even more lives than we thought."

"The son of a bitch got what he deserved."

"I'm not saying anything against that. All this time and we never knew his name."

"Who cares about his name?" Dean frowned.

"Could have made it easier to track him. Azazel."

"Whatever."

"You'll look into it, Bobby?"

The older hunter pulled at his cap. "I'll look a bit, yeah, but I'm far more concerned about the apocalypse, the idea that angels would exist and this Lilith."

"I agree with Bobby," Ellen said. "We need to prepare for what is to come."

End Chapter 1

AN 18th September 2013:

I've been watching Supernatural. Perhaps you can tell how far I've gotten by reading this? I've watched up till episode 3 of Season 3 so far. I've spoiled myself by reading crossovers though so I know a bit about what will happen later, and then I can't help but read wiki pages so yeah.

I started on this story only a few days ago, so it's easy to say that the series are inspiring me.

I think evil Harry is interesting and I gave it a sort of try here. I've got a few ideas for how this will play out and I am bound to get inspired as I keep watching the show. Let me know what you thought.