This is a CSI Las Vegas/Supernatural Bunny. I was originally going to write this myself and actually wrote chapters 1 and 2 and wrote part of chapter 3 however, I can no longer write this story, so I decided to let someone adopt this bunny. You can use what I have written for it or start from scratch, I don't mind.

Summary: Gil Grissom is called in on a case along with his team. At the hospital they meet the victim of an attack, who turns out to have a connection with Grissom that no-one could have predicted...

Pairing: Castiel/Dean, Greg/Nick, Ruby/Sam

Chapter 1

Grissom pulled up at the hospital, switched off his engine and climbed from his vehicle. At the door of the hospital he was greeted by Sara and Nick and they walked inside, heading to the reception desk.

"Hello, my name is Gil Grissom, and these are my co-workers Sara Sidle and Nick Stokes we are from the Las Vegas Crime Lab," Gil introduced them, "we are looking for the young man brought in who was beaten up." The receptionist smiled at them and looked at her list.

"Ah, yes, no-one knows his name yet, but he is in room 8C," the receptionist said politely to them.

"Thank you," Gil waved goodbye and followed by Nick and Sara he walked into the elevator. Getting off on the correct floor they walked over to the correct room. Inside was a young man, around 27 or so, sat up in the bed. He had an array of painful bruises on his face and his fingers were strapped together indicating breaks. His black hair was tousled and showed signs of cuts from the dried blood. He was wearing a white t-shirt and blue pyjama pants that were given out at the hospital. His previous clothes were bagged separately into bags ready for the Crime Lab to process.

"Sara, can you find the Doctor who treated him and talk with him- ask if they collected any samples for us. Nick, can you process him while I ask him questions?" Gil asked, though his co-workers knew that it was an order.

"Sure," Sara answered and walked off to the reception on that floor to inquire after the doctor.

Nick and Greg walked in and looked at the young man whose blue orbs were now fixed on them. Both CSI's admitted it was slightly unnerving.

"Hello, my name is Gil Grissom and this is Nick Stokes, we are with the Las Vegas Crime Lab, we are here to ask you questions about the attack and also collect any evidence which will help us in this case," Gil told the young man who simply blinked at him. The man nodded and waited for them to begin.

"Can you hold your hands out please?" Nick asked, while setting his kit on the table next to the bed. Obediently the man held out his hands and waited. Nick pulled out a swab from his kit and cleaned out what he could get from under the man's finger nails. Nick found it odd that the man's never stopped looking at what he was doing; he seemed intrigued by this and displayed an almost childlike curiosity.

"Can you tell me your name?" Gil asked, his eyes looking at the young man like he was a puzzle.

"Castiel," the man answered, his blue eyes never straying from what Nick was doing.

"Castiel, that is an unusual name," Grissom remarked, it was biblical if his memory served him correctly. Castiel didn't answered but was opening his mouth as Nick took a DNA sample.

"Do you remember who attacked you?" Gil questioned, Castiel seemed coherent enough so maybe he was able to see his attackers.

"No, they dragged me down and hurt me," Castiel told them, his voice perfectly moderated and again they couldn't help but be reminded of a child as he seemed to almost pout at the thought of someone hurting him.

"Do you live in Vegas?" Grissom asked while looking at Castiel more intensely. The man was injured and yet he was showing no signs of pain and even being drugged from pain killers.

"No, I was visiting," Castiel answered.

"Was this a trip for business, family or pleasure?" Grissom asked.

"Business, my Father sent me here to help someone," Castiel replied while Nick combed his hair through for evidence.

"Your Father?" Grissom asked. Had someone rang him to inform him that his son had being hurt?

"Yes, my Father sent me here to help someone," Castiel answered but it irritated Grissom that the childlike innocence seemed to shine through again making it seem unlikely that Castiel was spinning his words. Everything seemed to natural- yet not. The way the younger man held himself, it was as if he was uncomfortable in his own skin.

"Did you manage to help them?" Gil prompted.

"Yes, I did, they will be okay now," Castiel simply told them.

"What was this person's name?" Gil asked, maybe if they could get a hold of this person then something's could be explained about this young man. Castiel seemed smart enough, however, he also seemed uncomfortable in the world around him, everything fascinated him to an almost childlike level, and that made Grissom wonder if maybe he had some medical problem, especially when he said, 'they dragged me down and hurt me'. He seemed like a child in a man's body.

A knock sounded that the door and they all turned to see Sara stood with a Doctor who was smiling at Castiel.

"Hello," the Doctor greeted everyone and began to look Castiel over.

"What are Castiel's injuries?" Grissom asked.

"Castiel huh?" The doctor looked at Castiel with a grin, "was wondering when I would find out your name."

"He never told you his name?" Gil asked, looking shocked- but then he remembered his conversation with the receptionist, she had said no-one knew his name.

"You never asked," Castiel voiced sounded through the room and everyone had to repress sniggers when they looked at the young man who was looking at the doctor as if he had betrayed him in some grievous way.

"Castiel, you need to get some sleep now," The doctor ordered and Castiel laid down looking at them. Gil picked up the clothes from the chair and walked out with Nick and Sara while the doctor continued to check Castiel over.

"Did you get everything you need Nick?" Grissom asked and received a nod from the Texan.

"Sara, what did the doctor say?" Gil asked, long through the window at the man who was looking at the ceiling with wide eyes.

"He said that Castiel suffered multiple breaks to his fingers, ribs and the bruises to his face and some cuts on his head. But other than that Castiel is fine," Sara answered.

"What do you make of him Grissom?" Nick questioned. Nick thought that Castiel was probably in the wrong place at the wrong time, and some low lives had jumped the man. Nick felt that with the habits Castiel had shown he was most probably mentally disabled or had previous trauma to his head.

"Let's get back to the Lab and process this," Grissom ordered and they left the hospital.

00000

An hour and a half later Gil was sat with a cup of coffee in the break room, looking over the information they had managed to get on this case so far, Nick and Sara were nearby eating as they were all waiting for the evidence to be processed. They had found no money, ID or anything to give them an indication of who Castiel was. Catherine and Warrick were nearby discussing the evidence from their current case. It was then that Greg walked in with a folder in his hands and a look of shock on his face.

"Greg, everything okay?" Grissom asked getting the attention of everyone is the room.

"I ran Castiel's DNA through the system, no hits came up on CODIS but then I decided to try and see if any match would come up for a parent- we got a hit, a father," Greg explained.

"And who is Castiel's father?" Grissom asked.

"You are," Greg answered and handed the file to a shocked Grissom.

Looking at the file he looked at the results, it was a truth. Castiel had 13 alleles in common with him.

Castiel was his son.

00000

Chapter Two

The room exploded with noise as everyone tried to ask Grissom what was going on. Grissom never mentioned having a son. Surely he would have mentioned a son…or a relationship? Previous marriage maybe?

"QUIET!" Greg yelled and everyone looked at the lab rat shocked.

"There's more, once I found that out I looked through birth records, his name is Matthew Richard Grissom, his is mother Rachel Fairbairn, who died 4 years ago," Greg told them.

"Rachel," Grissom sighed, he knew this woman- so Castiel, or rather Matthew was his son.

"Matthew? Then why did he say his name was Castiel?" Sara asked, looking confused.

"There's more, and this is where it gets interesting," Greg began, "a missing person's was put in 8 months ago for him, apparently one day he never turned up for work and after checking his apartment they found it empty, it was like he up and left, with no possessions, not even his wallet," Greg explained.

"And now his name is Castiel," Gil mused, "at least he seems to think it is."

"Maybe kidnapping?" Nick suggested.

"Greg, was he adopted by someone, maybe Rachel married someone else," Gil asked.

"From the records I managed to find, no, however, for a brief time she was married but they divorced 6 years ago," Greg answered, "why?"

"Castiel mentioned he came here to help someone, because his Father sent him here," Grissom explained, "maybe the person he calls Father was the one who took him?"

"I'll look into the ex-husband," Nick offered.

"I think it would be better if I didn't work on this case, after all it is now personal for me," Gil told them, they all nodded understandingly.

"What will you do in the mean time?" Catherine asked.

"I think a trip to the hospital is in order," Gil spoke clearly and Greg handed him the folder, knowing that the information to prove he was Castiel's father was inside.

He walked from the Crime Lab and towards his car wondering why he never was told by Rachel he had a son. She had known the child was his, the child's legal last name showed this…so why?

00000

Dean sighed; Sam had left to go with Ruby after some demon. His brother swore he wasn't using his powers but the older hunter was wondering if his little brother would use them behind his back. After Castiel's warning that he needed to be stopped Dean had taken the words to heart knowing the angels meant business. His tried to stop his brother going out with Ruby but his brother was a giant- it would take more than Dean to stop his brother.

He was also worried about Castiel; his lover hadn't popped in for a while. Usually Castiel would come when Sam was off with Ruby- however for the past four days he had not. He had gotten very used to Castiel popping in whenever he wanted. And his angel had failed to come for a while, he understood there were other battles that needed Cass, but Castiel never was away for this long. Dean was worried.

"Mud monkey," the voice sounded through the room, disgust lacing the tone.

Dean shot up from the bed and looked with disdain at the angel.

"What do you want?" Dean snapped, he had no patience for this angel.

"I have a job for you," Uriel stated.

"Hate to break it to you but I only take missions from Castiel," Dean retorted.

"The mission is to go to Las Vegas to help Castiel," Uriel growled, and Dean swore he would hear the angry flapping of wings.

"Castiel? What happened?" Dean demanded, trying to understand why Castiel would need his help, usually it was the other way around.

"Castiel was found by Alistair," Uriel told him and Dean felt his heart stop, fear coursed through his veins. What had that demon done to his angel?

"What did he do?" Dean growled, wanting to show Alistair just what he had learnt under his teachings.

"I will leave it to Castiel to tell you that, however, one thing I will tell you is that Castiel's powers are bound for a short time, he remembers everything and can still communicate with Father- but otherwise he is mortal," Uriel began, "his powers should return within a few days, maybe a few weeks depending on how powerful the enchantment placed on him was."

"Powerless? Can he defend himself by mortal means?" Dean asked, fear once again rising within his gut.

"To an extent," Uriel answered, "however, he is vulnerable in this state as he does not understand the world around him."

"Okay, I'll call Sam and we'll head out now, Vegas is only a few hours away," Dean told the angel, at least it was by his driving speeds, he walked over to the bed and started to throw his things into the duffle. Turning to the angel he came to a resolve.

"Thank you for coming to me about Castiel," Dean told Uriel.

"Hurt him or fail him and I will smite you," Uriel simply growled.

"Wouldn't doubt it baldly," Dean quipped.

With a rustle of wings Uriel was gone and Dean brought his cell from his pocket.

Ring

Ring

Ring

"Hello?"

"Sam, it's me, we got a mission, get your ass back here now," Dean told his brother and snapped the phone shut and continued to pack his bag.

00000

Gil walked into the hospital and headed straight for Castiel's room. On the way over he kept glancing at the folder Greg gave him, his son was an accountant, and from the grades he received in school was incredibly smart. Gil couldn't help but wonder what had happened to Castiel to have him showing signs of a mental illness. Maybe he had regressed after he disappeared? Maybe this 'Father' person hurt him and this was how Castiel ended up from the treatment.

Walking to the room Gil stopped short when he noticed that the bed was empty. Turning he hailed down the nearest nurse.

"Where did the man in this room go?" Gil asked, trying to keep emotion from his voice.

"I don't know," the nurse stammered and hurried over to the staff area of the ward and came back with a few nurses, "We'll find him."

"I will help," Gil stated and walked off. It wasn't until he had walked near the Chapel of Hope he had luck. At first he heard a low murmur of a voice, speaking a prayer, Latin he suspected. Opening the door he looked inside to see Castiel knelt at the front, his voice clearly reciting a prayer he knew by heart.

Gil simply watched. The sound of the strong voice speaking those words seemed to bring warmth to Gil. The beauty of the words spoken with passion and understanding of their meaning as they came from Castiel's lips. After a while Castiel stood up gracefully, much too gracefully for a man with broken ribs, and turned to face Grissom. His now serious yet calm face showing no surprise to see Gil.

"Hello, Castiel," Gil spoke quietly, "I think you are meant to be in your room, the nurses are looking for you."

Castiel nodded and walked side by side with Gil back to his room. Climbing into the bed he sat up, looking at Gil with those impossibly blue eyes.

"I need to speak with you about something," Gil started.

"CASS!" A voice called out and Gil turned to see a worried looking man standing in the doorway, green eyes looking at his son drinking him in.

"Dean," Castiel whispered and Gil's eyes darted over to Castiel who was smiling widely at Dean.

00000 (A/N: I don't know if they have Chapel of Hope's in hospitals outside the UK but here we have them, it's for people of any religion.)

Chapter Three

Dean walked into the room, his green eyes looking over Castiel, mentally looking over the mean bruises on his lover's face, while swearing to kill Alistair for even touch Castiel. Castiel held out a hand to Dean asking him to come closer wordlessly. Dean strode forward, closing the space between them rapidly, grasping Castiel's hand as if it were a lifeline. Castiel's blue orbs locked with Dean's, as Dean cautiously reached out a hand and ghosted his fingertips along Castiel's face.

For a while they simply looked at one another, silence enveloping them as they simply were content to be next to one another. Dean then seemed to notice that someone else was in the room and his green eyed turned on Grissom as he dropped Castiel's hand and his hand moved from Castiel's face towards his hip, in easy reach of the gun there.

"Hello," Dean greeted the stranger with a tight smile.

"Hello, I am Gil Grissom, from the Las Vegas Crime Lab," Gil introduced himself, while standing and holding his hand out to the other man. Dean studied the man before shaking the man's outstretched hand.

"Dean Anderson," he replied while glancing over at Castiel. He mentally smiled, before he was pulled from hell he would not have gotten away with lying to a CSI, however, now he had some angelic assistance, Uriel had done a spell to protect their true identities. No-one would be able to find out if they were who they said they were.

"How do you know Castiel?" Grissom asked, wondering who this man was to his son. A friend, lover, captor? Gil did not know, however, Castiel had not looked away from Dean since the man had walked into the room.

"Through some mutual friends," Dean said while smiling at Castiel, making the angel beam brighter at him.

"Did he contact you about his attack?" Gil asked, as far as he knew Castiel had not contacted anyone.

"No, I was on my way here to meet him anyway," Dean answered while walking over to Castiel and placed a hand gently on the angel's shoulder.

"Would you mind giving us a few moments alone?" Castiel asked, speaking for the first time since he had said Dean's name.

Grissom nodded and stepped from the room, closing the door, and walking to where he could see inside the room through the window on the corridor.

Inside Dean sat down onto the bed, looking Castiel over with worried green eyes.

"Are you sure you are alright, Cass?" Dean asked softly, taking Castiel's hand and rubbing his finger's over the smaller man's knuckles.

"I'm fine, Dean," Castiel answered.

"Uriel sent us," Dean started, "he created this alias's for us, Sam is apparently my cousin who is married to Ruby, they are both here too."

"Married?" Castiel gave a small chuckle.

"Yes, so you will have to pretend you like her," Dean stated, laughter dancing in his eyes.

"I will be nice," Castiel promised.

"Was it Alistair that attacked you?" Dean asked, concern written over his face.

"I believe so," Castiel whispered.

"Don't worry Cass, he won't come near you again," Dean told Castiel, his lips set in a determined line.

"You'll protect me?" Castiel asked, a small smile gracing his lips.

"Yeah, the badass hunter will protect his angel," Dean cracked with a smile.

"Yeah," Castiel whispered and his hand squeezed Dean's tightly.

Dean leaned forward and pressed his lips gently against Castiel's chastely. One hand came up and rubbed over Castiel's cheek gently wanting to erase any hurt Alistair had inflicted on his Angel. Dean pulled away and shot his most dashing smile at Castiel. Castiel smiled back, his eyes shinning brightly and Dean swore he could see heaven in those eyes.