Helloo! First of all, this is my first crossover. In here, I use the same Crowley as in GO (physically and psychologically ), but after the events in GO, he met the Winchesters and became the king of hell. Aziraphale uses a girl's vessel, but only because if the fact that I always like to have a girl in the story, I love heroes, but every story needs a strong female character. Dean is kind of a dick in the first part of the story, I really hate myself for that, but I promise that he will change. Balthazar was brought back to life because it would be a crime to kill someone with such a sass, and because Sam needs his own angel! So I think that quite explains it all. I don't have a beta and I am not a native so, all mistakes are mine. Here is the first chapter…

Enjoy!

The tall figure got out of the old Bentley, even though the road was dark, the man's eyes were covered by a pair of black sunglasses. He was attractive, that was the first thing you could deduce when you saw him, he had dark curly hair, he was fit and he was wearing a black suit with a red shirt and a black tie, if you saw his car then you could probably deduce that he was old fashioned, the cassettes of classic music rode shotgun. The things that you would never deduce was that the man who was walking slowly to a door that could not be seen unless you were looking for it, was not a man, or that he was older than humanity, or that the classic music was indeed Freddie Mercury's greatest hits; but details, right?

A.J. Crowley was tired, he hadn't slept in a week, and even though he didn't need to, he had grown familiar with the human habit. He sometimes wondered why it had to be him the one who cleaned the Winchesters messes, but then again he had met Dick Roman, the leviathan's leader and he had bitten his long bifid tongue, he really hated that guy, monster or whatever he was.

The serpent hummed 'Somebody to love' as he reached the bunker's door, he had to admit that the kids had found themselves a nice place to live in. The Winchesters had always been a problem in his last two years, after all, they kind of started the second apocalypse, but this time with Lucy and Mike big brothers. They were good hunters, that was for sure, but then again he was a demon/serpent/angel sauntered vaguely downwards, he was kind of their thing to hunt. And then there was the angel, well, the squirrel's angel to be precise. Crowley had been at first slightly scared that Castiel would recognize him as a fallen angel, because he had gone great lengths to make the Winchesters believe the story of Fergus McLeod, because the real version would make the hairless ape's brains explode. And then there was the other new angel, the one he actually like because it was the only one who would share a good drink with him (Dean would never share anything with Crowley). Balthazar was a selfish, evil bastard, just like him.

So as he reached the lyrics of the song he was humming he opened the bunker's door, the light made his vertical pupil's shrink, he hissed as he got inside and closed the door behind him, he went downstairs as he continued humming, he really walked through the bunker as if it was his house. Everything seemed in order he had seen three figures in the living room, which were probably Sam, Dean and Balthazar (since Cas avoided to be near Dean's presence as much as he could, because the hunter always found a way to end up talking about how HE had got them into that bloody mess).

Crowley reached the end of the stairs as he raised his gaze and at the same time the figure who was supposed to be Balthazar but was shorter and the hair was longer and clothes were less elegant, turned around; soft blue eyes landed on Crowley's yellow ones. Her mouth turned into an O as she recognized him. Crowley's sunglasses unexplainably fell to the floor, his jaw fell to the ground.

"A… Aziraphale?"

Aziraphale didn't like America, in fact, she didn't like anywhere that wasn't in Great Britain. She had grown used to the weather and to her small library in her small neighborhood. She had managed to build it up again after the small incident with the fire, the books were gone, but now, almost forty years later she had managed to gather a rather nice collection of books. She had been living a quiet life, no angels, no monsters, no demons; well, maybe that last one still hurt a little, since she missed her old snaky friend since the last time they met.

Okay, so Aziraphale missed Crowley, and maybe she was a bit bored of her actual lifestyle. She missed having someone trustful to talk to (yes, she did consider Crowley trustful). So one day she was walking around London and saw one of those places where you could use a computer, she went into the place and looked for things that may have happened lately. What was supposed to be a one hour stop, turned into a whole afternoon of becoming aware of the many things that had happened since she last got involved with heaven or hell; another bloody apocalypse, Lucifer being freed, Lucifer getting back in the cage and then something that made the blonde angel's vessel's blood run cold: The leviathans getting out of purgatory (This of course were not actual news on the internet, but as you might have already figured out Aziraphale was a quite clever angel).

Aziraphale got kicked off the café as it was past eleven and it ought to close. The angel walked all her way back home letting everything she had just learned sink in, she had been away for far too long, she had ignored everything and she had been just so self-centered. She had to fix that immediately, she had to help with the leviathan issue; just thinking about it made her sick (well, she was an angel and she couldn't actually get sick, but she was sure the human feeling was similar to what she was feeling). The leviathans were really old creatures and she knew that they were really difficult to get rid of. There were only three things that could kill a leviathan, and two of them were out of her reach, but one wasn't; and if there was a moment where she could help, well, that would be it.

When she arrived to the library, she continued walking all her way to a small room, she whispered something softly and light was made. The room was empty, the walls were dark blue and there was a single lamp on the ceiling, a lonely brown carton box was in a corner; the angel walked slowly towards it and opened it carefully, inside it there was a medium length sword, it didn't looked special, in fact, if anyone saw it they would think it was just a normal, rather small sword, but Aziraphale smiled and suddenly the tip of the sword started to burn. The only thing that was left was to find someone called Dean and Sam Winchester.

Crowley stared at the woman for what a normal person would consider a considerable amount of time; it was quite understandable since he hadn't saw her an ages (more like years).

Aziraphale was feeling exactly the same, since the last person she expected to find there was Crowley, even though, she tried to keep calm and smiled nervously.

"Hello Dear" She said, Crowley seemed to be pulled out of his trance as he realized that he should probably say something.

"Well, hello angel" Crowley replied, picking up his sunglasses and replacing them back over his nose.

"Can anybody explain me what the hell is going on here?" A very starting-to-get-pissed-off Dean Winchester asked.

"Well, I suppose a presentation is in order, Aziraphale, as you might already know this are Sam and Dean Winchester, hunters of supernatural creatures; Moose, squirrel, this is Aziraphale, she is an angel" At that point Dean rolled his eyes while Sam sighed pulling a bitchface as well that clearly said 'not ANOTHER angel please'.

"An angel, huh? So I suppose you also came here to help to clean the leviathan mess, didn't you? Well, sorry to tell you feathers but we already have two angels and not even one of them has been able to kill a bloody leviathan, not even one, in fact, it is one of those angels the responsible for those black blooded freaking monsters being freed and about to take over the fucking planet!" Dean yelled, Crowley rolled his eyes, Aziraphale was pale and her eyes were wide in surprise and Sam had already another bitchface which meant 'Oh my god Dean, do you seriously have to tell everyone that Cas is the one to blame? That was so rude!'

Dean realized that he had crossed a line, he stood quiet for a while, looking at the floor and shifting his weight from one foot to another. Dean had been complaining and blaming Castiel since he reappeared as Emmanuel; Cas had been trying to fix things, he had helped Sam, he had been trying to get rid of the leviathans since he got back the control over his own mind, after the Lucifer issue; but even though Dean was really harsh at him, he kept blaming and being a complete asshole as Sam had pointed out more than one time, and what the main problem was that Dean did not hate Cas as much as he hated himself, he couldn't face the fact that he had not tried hard enough to save the angel, he had let him suffer and he hadn't done everything he could to stop him, and that made him really angry. But as everyone knows Dean Winchester was not one to show his feelings, well, actually there was one person who didn't know, and that was Aziraphale. She had been quite shocked at the hunter's words, never in her life she had met someone that had such a bad attitude at her the moment that person had met her. Well, there was Crowley, who had quite a snarky attitude, and had yelled at her many times, but they knew each other for more than sixty thousand years.

Crowley took the opportunity to stare at the angel for a moment, he realized she hadn't change a bit since he last saw her, her eyes were still as blue as the sky and her expression as innocent as it would ever be. He wondered for a moment how would things be if they hadn't gone separate ways, but the thoughts were lost as soon as a fifth voice joined the room.

"Wow! Winchesters, always saying the wrong things at the worst moment and in the worst time, aren't you Dean?" A very familiar voice with a strong British accent said.

Sam spun around to meet face to face with a pair of icy blue eyes, Balthazar smiled at the youngest hunter. Dean on the other way turned and he suddenly paled and swallowed hard as he met with Cas, who was standing behind the eldest angel. Castiel held a very hurt expression, he had been hurt lately by Dean's words more frequently, but it still hurt. Crowley watched as Aziraphale's eyes widened in surprise as he saw the other two angels in the room, and then Balthazar saw her.

Balthazar had been a pretty popular angel, but that hadn't always been that way. As fledging he had only a few friends, mainly he had two best friends, and Aziraphale and Cas. But the blonde angel was different, she was the eldest angel she always took care of them, somehow she managed to fill the gap their father had left, she took care of them, taught them, and then, one day she left, and that's when Balthazar changed, to the point in which he faked his own death and left heaven, but then Cas found him, and the youngest angel had asked for his help; Balthazar obviously accepted, not wanting to leave his little brother alone. Until his little brother stuck an angel blade on his chest, and that had hurt, that hurt pretty much. And finally daddy dearest had made an appearance and he had been resurrected. Balthazar forgave Castiel, after all, he understood his little brother, and Cas had already enough on his shoulders to carry Balthazar reminding him of what he did (that had turned out to be Dean's job). So when Balthazar saw the angel, who had taken care of him for so many years in heaven, he surprised all the others by making his way to her and wrap his arms around her in a hug.

"I have missed you too Balthazar" Aziraphale said before the other angel could say a word.

The demon and the hunters watched the scene astonished, while Cas stood behind them all with a sad expression on his face, when the two angels broke the hug with a smile, Aziraphale saw Cas, and she smiled even more widely.

"Castiel" She said walking towards the angel and hugging him as well.

Cas hugged her back and suddenly whispered.

"I'm sorry" He said, Aziraphale frowned and broke the hug looking at her brother's blue eyes.

"What are you sorry for Castiel?" She asked.

"I… I was the one that freed the leviathans from purgatory" Cas said not daring to look at his eldest sister's face.

Cas waited for her to start yelling at him, remarking how stupid he was, after all that was what everyone had been doing since he came back, especially Dean, and that really hurt. He had yelled at him, he had pointed out quite clearly that he didn't care about the angel anymore, and their bond had been breaking little by little, as Castiel's heart. But the eldest angel smiled tenderly at him.

"We all make mistakes little brother, it is clear to see that you didn't want this to happen. I have been away for far too long, but I am glad that I can help you now" Aziraphale said, leaving a very surprised Cas and a smiling king of hell.

"Excuse me, I don't mean to ruin the chick flick moment, but exactly how do you plan to help us, in case you haven't noticed, angels don't scare the leviathans, they aren't affected by anything, except Borax, and that doesn't even kill them, so unless you have a magic wand that can puff them off, they can't be killed" The eldest hunter said.

Sam covered his face in shame as his brother talked, he really hated that Dean, the one that didn't care about anything, the one that yelled at Cas. That part of Dean really made him want to punch his brother.

Aziraphale frowned, she felt offended for a moment, but then she looked at Dean, and she saw that the man in front of her was broken, he had been hurt too many times, he was tired of fighting, he had lost too many people. Aziraphale eyes softened, and she felt guilty for a moment, for being away all those years, for having left her brothers alone, for not having searched for Crowley… she could have helped him, but, after all, he had been the one who left without even saying goodbye, and she had missed him so terribly much.

The female angel took a deep breath and smiled, she was there now, and she wasn't too late to fix a few things.

"You are right Dean, the leviathans are very hard to kill, but as I said before, I came here to help you" Aziraphale said, grabbing the blade from an inside pocket of her coat.

"This blade was given to me as I became the guardian of the seventh gate, It is called the flaming blade and I can assure you that it can kill any monster, leviathans included" Aziraphale said, smiling proudly as a small flame came out of the blade (to make it a little bit more dramatic).

"Angel" Crowley said smiling as the others watched in awe the blade

"Angel you're a bloody genius"

After that the two hunters, three angels and the king of hell began to prepare an strategy to kill Dick Roman and rescue the young prophet who had been captured by the leviathan with the tablet. They all agreed that it was best to have a distraction, while someone recued Kevin and another two went to kill Dick.

Crowley had insisted in going with Aziraphale, the blonde angel (Aziraphale, since Balthazar was drinking a glass of scotch that Crowley had kindly offered), complained saying that it would be safer to go with one of the hunters, but Crowley kindly reminded her that she hadn't fought in years and he had been all those years fighting and she had probably lost all the practice she had. At that point, Aziraphale excused herself and in a flutter of wings she was gone, Crowley immediately also excused himself and also disappeared.

Sam sat in front of his laptop studying the corridors of Roman's building. Balthazar then said that it would be better if he and Sam were the ones who rescued Kevin, since he was really good at sneaking into places and Sam could help him by watching his back. Cas face then opened his eyes in panic as he knew what that meant, his eyes suddenly met with Dean's green ones, the hunter grabbed his beer and took a long sip; then he looked at Cas one last time.

"I really hope you don't screw it up" He said, Cas was about to answer when Dean spoke again, just one single word.

"Again"

Sam swallowed as his brother left the room and went to his own, then his eyes fell on Cas, sitting on the couch, holding a really sad expression. Sam could not believe how cruel Dean could be sometimes, Cas was his best friend, Sam was sure that their relation was something more than friendship. And he hated seeing Cas so vulnerable, because Dean's words hurt the angel more than he could imagine. He knew that talking to Dean would be useless, because his brother would never listen to what he told him, he would never open up to him. And Sam wished he could do something to make his brother realize his feelings for Cas. But for now, the only thing he could do was to help the angel, because the new blond angel had made him realize that even he had treated Cas badly and he shouldn't, because nobody knew better than him about making mistakes (after all, he had started the apocalypse).

"He doesn't mean it Cas" He said making a pair of sad eyes look at him

"He is just angry at the situation, you know how he is, he doesn't really hate you" He said trying to make the angel feel better

"Thank you Sam, but he is right, I deserve this" Cas said before he suddenly disappeared.

Sam sighed heavily then he turned his eyes back to his laptop, he had forgotten that he wasn't alone when a voice made him jump on his chair.

"Poor Cassie, your brother is even more stupid than I thought, now I understand why you are the one with the brain" Balthazar said

"And I must admit that you got the looks too" He added, making Sam´s cheeks turn to a light shade of red

"You are the one who decided that it would be a good idea to put them together in the first place" Sam said, not moving his eyes from the screen

"Well, I think it's a great idea, you know, they kill the source of their problem together and they realize that they are a great team" A smirk appeared on the angel's face

"And meanwhile you cover my back while I get to watch you kill leviathans with that perfect body of yours" Now, that made Sam's cheeks get even redder, he shut down his laptop and stood up suddenly.

Balthazar watched amused as the hunter mumbled something about needing to sleep and making sure Dean hadn't broke a fist (one day he appeared with his knuckles covered in bruises, nobody had dared to ask anything). The hunter started to walk to his room

"Goodnight Balthazar" He said as he disappeared into the corridor.

Balthazar chuckled.

"Goodnight Darling"

"Zira" Crowley said as he saw the blonde inside the Bentley.

The angel turned her eyes on him, she didn't quite know how had she ended up inside the old car, but she knew that besides her bookshop, it was the place she felt more comfortable in, she loved that car (not as much as his owner but she quite liked it). The only thing that was missing was a demon on the driver's seat.

Crowley walked to the car's other front door and got inside it.

"It has been a while, hasn't it?" Crowley asked.

"Yes, in fact I would say too long since I last sat here" She said looking at the demon through the sunglasses.

"I'm sorry if I said something back there that might have annoyed you" Crowley said

"Are you apologizing? Crowley you don't have to do that, it…it's just that I have missed so much and I haven't been there, I should have helped, I could have helped…" Aziraphale was cut off by Crowley.

"You are helping right now Zira, ye to be you have helped more than you can imagine" Crowley said, the angel smiled

"Thank you dear, I really have missed your company" She said, she did not know how much her words impacted on Crowley, the King of hell who was supposed to have no feelings, but even when he tried really hard not to care, the bloody angel was his weak point, luckily for him, not even Aziraphale knew that, so he just had to keep her safe and everything would be normal again, as much as he would love to be with the angel he knew that she was better in her bookshop were no harm could get to her than by his side.

Aziraphale did not know the reason why Crowley had kept her unaware of all the things that had happened, she didn't even know that it was her old friend the one who was avoiding her to get into trouble. Crowley really cursed himself for having let the angel get involved in this mess; but therefore, that was the reason why he had chosen to stick by her side, to stop her from getting hurt, he would never forgive himself if something happened to her, after all, she was his only friend.

"You know what? I have missssed you too Zira, I have missssed you too"

The next morning was quite weird, Crowley and Aziraphale had fallen asleep in the Bentley, the demon woke up to find himself with an arm around the angel's shoulders and a head with a lot of blond hair leaning on his chest. Cas did not appeared until five in the afternoon, and just in the exact moment when Dean started wondering out loud if 'the bastard had ditched them and was going to run away from his own mess'. Sam tried to avoid Balthazar, unsure if the angel would try to start flirting with him again.

At eight, the Impala and the Bentley left their parking spots, and half an hour later they parked again in front of a tall white building.

They got out of their respective cars (the Winchesters and Balthazar out of the Impala and the other two angels and the demon out of the Bentley). Balthazar was having a monologue with himself about how wonderful was Paris in comparison to the United states (Dean couldn't care less about what he talked and Sam was too focused in trying not to think about Balthazar, which seemed to be quite hard for the hunter). Meanwhile Crowley and Aziraphale continued their discussion on whether it was possible to tempt an angel or not, while Cas stood quietly behind them.

They realized that the entrance was more guarded than they expected, but they decided that it would not make much difference. They were about to split when Dean stopped Aziraphale.

"The blade, Azir… Azirpha… feathers" Dean said, giving up on trying to pronounce the angel's name

"Oh, you're right dear, I almost forget about that" Aziraphale said drawing the blade from her pocket.

She held the blade for a second, and then, to everyone's surprise she ignored Dean's demanding hand, she turned back and looked at the black-haired, blue-eyed angel and with a slow movement, she looked at him and gave him the weapon. Dean's jaw fell, leaving a very comical expression on the eldest hunter's face, Cas looked at his sister in surprise and the blonde angel smiled; then she turned around and saw the anger starting to appear on the hunter's face.

"Oh, Dean, you should probably know that the blade can only be held by an angel, if you touched the blade you would be reduced to a pile of ashes in a matter of seconds" The angel explained.

"Right" Was the only thing that Dean was able to say.

"We should probably get going if we want to do this today" Balthazar said, suddenly grabbing Sam's arm.

"Remember, in half an hour we are all here, we get out of here as fast as we can" Sam said, trying to get rid of Balthazar's grip.

"Come on guys, everything is going to be just fine" Balthazar said, trying to convince himself of what he had just said.

"Let's just get to it" Crowley said, suddenly grabbing Aziraphale's hand and walking away from the group and to the main entrance.

"Ready darling?" Balthazar said, looking at Sam, but before he could answer they were gone in a flutter of wings.

That left only Dean and Cas to wait until Crowley and Aziraphale cleaned the way to the office of Dick Roman. Dean turned around and looked at Cas, who looked reluctantly back at him, and for the first time in a while, Dean realized the sadness that Cas eyes held. Unable to stare at him any longer he looked back at the building, just hoping that once all of that had finished, things would be better, although he knew that things would never go back to the way they were, he just hoped that Cas could forgive him for the way he was behaving, for he would never forgive himself.

Sooo, How was it? Please let me know what you think about it… I know, I know… sorry for destiel shippers, but I am doing that for a reason… I will post the next chapter as soon as I can. Please review!

-Gabe ;)