I have had this in my head, a cross-over with sherloc (TV series/BBC series) and Supernatural. and my computer as slow as fuck, so... yeah.

main parings, incase you care:

JohnLock (John/Sherlock)

Destiel (Dean/Castiel)

Sabriel (Sam/Gabriel)

Sastiel (Sam/Casitel) (You need to SQUINT to see it)

Cobby (Crowley/Bobby) (I don't care what you think, I like it) (Only light)

And lets go shall we?

XXOOXXOOXXOO

*With John* *no ones pov*

It was a normal day for john. No case, so far, so Sherlock was doing some experiments, and John was reading the news paper. Suddenly, a ring echoed throughout the shared flat.

"Get that, will you john" It wasn't a question, so John just sighed and silently put his paper down to get the phone. The phone was on the fireplace, so it wasn't a far walk.

Picking it up, he answered it.

"Hello?"

"John? This is Lestrade. Another case that seems right up your ally."

"Right, I'll tell Sherlock." And with that, he hanged up.

Deciding to give the Phone to Sherlock, he walked over to The Consenting detective and put his hand out with the phone.

"Lestrade said we got a case. Its up our ally."

That got his attention. He got up and put on his coat and scarf. It was a bit chilly, but it didn't bother the doctor.

They walked to the place that Lestrade said for them to go. He texted the place and it wasn't that far, only a few blocks.

When they got there, It was apparently a mass genocide. Over twenty people died. Cuts, and stabs in the necks and bodies. Some were impaled. And some had their eyes burnt out. John recognized the stabs to the necks, and the eyes being burnt out.

God no. Not this. Really? Here? Oh my lord, why?

John sighed and looked around. He saw a white powder. He sniffed it and cringed. Sulfur. That meant one thing. Demons. Just Great.

Sherlock was having a field day. But he was also very confused, trying to figure everything out. There were people who were obviously very well off, and some were not so the same. He looked over to John who was on his phone.

"John, what do you make of this?" He asked. John looked up, surprised. He seemed to hesitate, and he shook his head.

"I got nothing-" Sherlock stopped his train of thought.

"No, you know something. You hesitated to say something. It also seems you know why, but you either don't want to say, or your blackmailed not to say. So tell us. What happened?"

John sighed. Sherlock can always deduce him. Shouldn't of tried to lie. Anderson, Sally and Lestrade all looked at him, with something of betrayal, maybe? He took a big breath.

"You want to know what I think? You want my honest answer?" Everyone nodded. Sherlock has a slight sad glint to his eyes, john noted. He was going to be put into the mad house for say this.

"Fine. Demons. Most likely Demons and Angels. How I know, and why I think this? Easy. Sulfur. Sulfur is the excess of the Black smoke which is demons. They can possess a human, like a ghost in a way. How I think Angels, is that they eyes are burned. Angels true forms are so bright, that they burn the eyes what ever lays eyes on them.

"Not only that, angels can burn the Demon inside the Human its possessing, also killing the human in the process, causing the Eyeless bodies over there. There could be rouge angels, as only an Angel Blade can kill another Angel. But there is the holy fire, which can also kill an Angel.

"But I wasn't here to witness it go down, so this is all what I got by looking around. Why I think Angels are here, is because Demons wont go against Other demons, Unless they hate each other, or they went rouge like the 'Rouge Angels'. Now have I made ANY sense at all?" John finished looking around. Lestrade was trying to process everything. Anderson and Sally looked at him as if he made it all up. And Sherlock's expression was unreadable.

"It makes sense. thinking about it and putting it together, it fits perfectly. But why would angels be here fighting Demons? Angels are supposed to be helping humans right? Why Would they kill humans? they should know that demons are possessing the humans, right?" Sherlock asked, interested in Johns 'Speculation'.

"Oh, Angels don't serve man. They're the "Warriors of the Lord". Or something along those lines. Even guardian Angels fight." John said. Talking to his Nephews and Castiel really helps sometimes. "Usually, I just refer to them as Feathery arseholes. Because they only care about themselves. They don't know the emotions we humans have."

"And you know this How?!" Anderson asked, Almost disbelievingly.

"I have nephews, who are in the middle of a fight between Micheal and Lucifer. Literally." And he wasn't joking. He Is worried sick over the kids.

"What do you mean, 'in the middle' of the 'fight'?" Sally asked, crossing her arms. John laughed slightly, and smiled, but the smiled turned into a frown.

"My nephews, Sam and Dean, are the vessels for Lucifer and Micheal. Lucifer is having a big temper tantrum, and Micheal is trying to stop him... or something along those lines." He paused, Inhaling before continuing. "If Lucifer gets Sam, and Micheal gets Dean, then one of them will surely die. Dean is considering it, but Sam is going to continue to say no. An angel needs the vessel to say yes, so they can possess them."

Lestrade finally snaps out of his thinking daze. "Well, okay. If what you said is correct, what do we tell the press?"

John shrugged, but then thought of something. "Maybe the 'killer' lured them all here, tied them up and killed them is different ways? But the killer also died by... I don't know... An accident?" John asked, Thinking about it. I did sound somewhat believable.

"Yes, I say that is what you should tell the press!" Sherlock walked up to John and grabbed him by the shoulders. "Now how about we go back. I'm sure Lestrade has got this." Sherlock gives Lestrade a look, and Lestrade gives the same look back.

John noticed and thought to himself well, it looks like I'm taking a trip to the insane asylum. Great. Demons are all over the place, the boys are going to need support, and I'm in the mental asylum. Then again, I do talk to myself, but that's normal for someone who is bored out of their mind when not on case. Sherlock does it.

When they got back the the flat, John decided to confront Sherlock.

"So when am I being taken to the Mental Hospital?" Sherlock looked up confused.

"Excuse me?"

"You heard me Sherlock. You, Lestrade, Anderson, Sally, you all think I'm absolutely bonkers, don't you? I mean, Demons, Angels. Who is going to believe something like that?" Sherlock gave him a weird look.

"You believe in it. And I believe you." John gave him a look that said I-don't-believe-you.

Suddenly a familiar tune of 'Cherry pie' by warrant comes from his pocket. Dean.

"Hey Dean, what do you want?"

"Uncle john? Hey, do you think me and Sammy can come over for a while? "

"Why? Whats happened? Are you boys hurt?"

"No, we're fine. Its just that We're going to need all the help we can get with facing Lucifer. And you might want to know what the plan is in detail."

"Okay... But dean you hate airplanes."

"Yeah, but we're getting a lift from a friend."

"Oh? You mean Castiel?"

"No he's still human. We have another friend." And with that, he hang up. John looked at his phone with confused look and turned to Sherlock.

"Well, looks like you about to meet the Winchesters. They're coming over." Sherlock gave him a confused look.

"Well do they know where we live?"

"Yep. Castiel brought them over once. It was after a case, while you were asleep for a few days, and they only popped over for a quick hello and to explain the situation. But as Castiel turned human, they're getting here with another friend." John said, not noticing that a certain Demon came behind him.

"And that would be me." John jumped and turned around to see the King of the crossroads demon smiling at him, with Sam, Dean, bobby and Castiel around him.

XXOOXXOOXXOO

Sorry that this was so LONG. But Next chapter will follow on with this. But If your confused, The Winchesters aren't actually Johns Nephews. Its just that their dad (John Wincester) Knew john (Watson). Like bobby is their adopted father, even if they aren't actually related. Do you understand? I know its confusing. PM me if you need any more explaining.

Thanks for reading, comments will help. :)