I know I should be working on "With Love and Pie" (after all I have had hardly any pie in there) But I had this idea for a Castle and Supernatural crossover. Tell me how you like it! Disclaimer: I don't own either show or it's characters, although if I did Castle and Beckett would have gotten married by now, Cas and Dean would have too, Sam and Gabriel would be living together, and Crowley would be less hated because Lucifer would ruling Hell. Also, Lucifer would take good care of and love Adam, because nobody else remembers Adam.

Castle looked over at her, her brown hair was pulled into a bit fancier of a ponytail, her makeup was done meticulously, and she looked uncomfortable as hell. She was wearing a light grey, ruffled shirt with a black pencil skirt that hugged her hips and ass tightly, she was also wearing shoes that Esposito would describe as "over-achieving secretary" shoes. Kate had refused to wear a fancy dress to the meeting with the Governor and choose to wear formal business clothes instead.

Kate shuffled from foot to foot, glancing over at Castle every so often. He was dressed very well. His black suit made his hair look lighter, his purple tie made his blue eyes pop. Kate forced her eyes to the Governor and what he was saying. It was something about how "proud he was of the department and it's..." at this he looked at Castle who grinned cheekily at him, "help." Kate rolled her eyes at Castle's fake pout. If you asked Castle, he'd probably tell you that the department helps him, but that they just benefit from it more then he does.

Castle fake pouted and kept looking over at Kate to see if she noticed. She did and she rolled her eyes. Inside Castle was grinning from getting that response from her but he forced himself to keep pouting. That is he did until Kevin Ryan's phone went off. Kevin quickly got up and stepped out of the room; Castle was jealous, he wished he had an excuse not to be here. If the longing look on Kate Beckett's face as she looked at the door was anything to go off of, she didn't want to be here either.

It was a relief to Kate when Kevin stuck his head back in the door.

"Triple homicide, right up our alley. Looks like it matches the last group of homicides. Said there was something strange about the place, we need to get ready to go now," Kevin told Kate. She let out a sigh of relief before turning to the Governor.

"My apologizes Sir, my team and I have to go," then seeing the pleading look on Castle's face out of the corner of her eye, "Also I might need my... help's assistance." The Governor sighed.

"Go then, save the world my friend. Solving one homicide at a time," The Governor replied. As they were exiting the room Castle whispered to her,

"That was so cheesy."

"Sounds like something you would write, Castle," Kate teased. Castle pulled a bitch face, but it quickly turned into a considering look, "Seriously Castle?"

"The man with the green Mohawk smiled at the inspector flirtatiously. With a wink he said, 'Go save the world hot stuff, solving one murder at a time.' I could actually use that," Castle said cheerfully. Kate rolled her eyes at Castle.

"To the normal police it would look like serial killings, five different multiple homicides, all killed the same way, for the same reason as we know, but by different people," Dean explained to Bobby over the phone as he and Cas drove to the latest homicide site. He would have had Cas zap them there, but for the fact that the place was crawling with police and it would seem a little suspicious for them to just come walking up. As Dean parked the car as close to the yellow police as he could, Cas pick out his FBI badge. He actually picked up the very first badge he ever used. Agent Eddie Moscone of the FBI. Cas smiled at it fondly before sticking it in one of the pockets of his favorite trench coat. Dean turned off the car, grabbed his fraudulent ID and opened the car door. He and Cas got out and walked around to the front of the car. Instinctively Dean reached over and fixed Cas's tie. Cas smiled at him and started walking.

They had just ducked under the police tape when someone stopped them. Cas let Dean do the talking as he normally did and just sat there and smiled at all the right times. The policewoman didn't stand a chance. So instead of getting flustered with the two, she took them to her superior.

"This is Detective Beckett, you can talk to her," The policewoman introduced them after talking to the Detective. Then, as she was passing by Cas he felt something being pressed into his hand, "and this is my number so that you can talk to me," the woman finished flirtatiously. Cas stumbled, as he always did when someone flirted with him. Finally he just smiled at the woman and nodded.

"Ahem," Detective Beckett cleared her throat to get their attention, as they were both watching the policewoman's retreating figure, "I'm Detective Beckett as was previously mentioned, and you are?"

"I'm Thomas Anderson, Serial Homicide Expert. This is my partner, Special Agent Edward Moscone," Dean answered them. Beckett raised an eyebrow.

"Moscone? Eddie Moscone?" asked some man coming up behind the detective. Cas nodded in response.

"An unfortunate name choice it turned out. He got picked on as a kid. I know, I had to figure a way to get his ass out of some nasty situations in fourth grade," Dean said.

"Can you speak for yourself Special Agent Moscone?" Beckett asked. Cas raised an eyebrow at her.

"I fail to see how I would not be able to, Detective Beckett," Cas replied in an unnervingly even tone for his low and gravely voice, "I must ask you, are there any strange markings inside?" the detective looked surprised by his question, but Cas continued looking around as if that should be the most common question in the world.

"Yes," the man answered for her. Cas immediately turned his attention on the blue eyed man.

"And you are?" Cas asked, he sounded like nothing Dean hadn't heard him sound like in a long time, he sounded prim. Like he was above the man in front of him. He asked it like he was asking why there was a slug on the sidewalk.

"Richard Castle," the man answered irritatedly.

"What part of the department do you work in Mr. Castle?"

"I don't, um, I don't work for the department. I'm a consultant. Well actually I'm a writer, I just help the department on some cases," the man, Castle, answered uncomfortably. Castiel raised his eyebrows in a patronizing way.

"I see, good. I will be able to work with you then," Cas suddenly sounded amiable, like he had just invited you over for tea and crumpets. The surprise on Castle's face was quite evident, as was the confusion on the detective's face.

"Ed here doesn't like working with the local police," Dean tried to explain to Beckett.

"You, Beckett, I will need your full cooperation. Thomas and I are currently working on a group of serial killings. I assume that that is what you believe this is?" Cas stepped over to Beckett, looking her up and down before looking her evenly in the face, "You are dressed far to fancy for just a regular case. Or any case that you are not undercover for. Why?" Beckett looked taken aback by the question.

"Um, I had a meeting," she answered slowly, "I don't see how this is relevant."

"It isn't, not as far as the case goes. I was just stating that you look nice. I take it that you prefer dark jeans, a solid color undershirt and a black jacket, paired with comfortable boots," Castiel said confidently. Beckett raised her eyebrows.

"So you have a good fashion sense, is that supposed to mean something?" She asked. Dean snorts.

"Ed has a terrible fashion sense. The one time he decided to change up his wardrobe he picked ugly Christmas sweaters. I thought my eyes were going to burn out," Dean said.

"It doesn't mean anything Kathrine," Cas said, pulling a bitch face on Dean.

"Wha- how do you know my first name?" Beckett asked. Cas raised an eyebrow.

"You honestly think that someone like me hasn't heard of someone like you?" Cas asked in a seductively low and sweet voice, that almost made Dean moan, "After all, you are the Kate Beckett are you not?"

"Well yeah, I mean, um, unless there is another the Kate Beckett," she replied, blushing. Cas smiled a sugary smile that made the detective stare at the ground.

"May I go and take a look at the symbols inside?" Cas asked her. Unlike how he first treated Castle, Cas acted with humble modesty now. Kate was nodding her head and leading Cas towards the big warehouse in front of them before Dean could blink.

"Are you sure your buddy doesn't like working with the police?" Castle asked, a twinge of jealousy was in his voice. Dean smiled.

"He only works with the hot ones," He replied, walking away from the man.