So this is a new story of mine that I've been thinking about writing for quite a while now. It's a Castiel/OC story that picks up around episode 10 of season 6. So please let me know what you think by reviewing! :)

I was having a pretty awful week so far. Now, I know what you're thinking, that I'm probably over exaggerating and that really my bad week wasn't really all that bad. But no, I'm not exaggerating. My flatmate was killed and then I found out that my flat was haunted by a ghost. Yep, indeed I did just say haunted by a ghost. And no I do not mean a Caspar the friendly ghost type ghost, I mean the type of ghost that wants to kill you in a rather horrific and brutal way! Ok, so now I'm guessing you think I'm crazy or something but I swear to you I'm not, this is all unbelievably real.

You see on Monday morning, I woke up to find Lauren, one of my housemates, dead. I'd knocked on her door to see if she wanted a cup of coffee, and when she didn't answer I had opened the door. I found her lying on her bed, her blood soaking through her top and pooled around her on the bed sheets. Her eyes were wide open, frozen open in terror. I'd screamed so loud that it had woken up my other flatmate Mona. We both stood, unable to move, for at least five minutes, before shakily, I reached for her mobile and called 911. The thing was, I recognised things in what I was seeing. There were no other signs of a struggle except for the knife wound, neither Mona or I had heard anything, and there was distinctive feeling in my stomach that just screamed one thing: supernatural. Mona went to stay with her parents, and I got in touch with my dad.

Thankfully, my dad, Bobby Singer, was an expert in all things supernatural. He was a hunter and a damn good one at that. He hunted all sorts of supernatural creatures; demons, ghosts, wendigos, and everything else weird. Dad would have come to help me himself, but well, he was recently paralysed after stabbing himself while being possessed by a demon; so, instead he sent Sam and Dean Winchester. They were hunters too, and good friends of my family, in fact, I'd spent so much time with them during my childhood that they were practically my brothers. I suppose he could have sent my sister Georgie but she'd been only just got home too. She was older than me, the same age as Sam, and as soon as she turned seventeen she had went out on the road, hunting, with a couple of other hunters that she had teamed up with. She moved back home when dad got hurt. I don't think he wanted to send her in case she got the taste for hunting again and disappeared on him.

So, for the last couple of days, Dean, Sam and I dealt with the ghost. We spent hours on the laptops researching my building, tracking down any possible gory deaths that could lead to a vengeful spirit sticking around the place. It turns out it was some young woman, Jessica Barnett, who had been a bit of a psycho when she was alive, going around killing other young girls who she'd been jealous of. I guess that had been her motivation when she'd killed Lauren. Lauren was tall, willowy, and blonde. A real beauty. A prime target for Jessica. She got pretty violent when she figured out we were planning on salting her bones and torching her psychotic ass, and it took the three of us to finally finish her off. We all came out of it with more than a few cuts and bruises! We were the fortunate ones, Lauren hadn't been so lucky.

"Thanks you guys" I said gratefully, as Sam, Dean and I sat in the lounge eating pizza, "I couldn't have done this without you, you guys probably saved my life"

"You're family, Kat" Dean grinned, his smile then turned into a grimace "besides, all this stop the apocalypse crap has been driving me crazy, we needed a break!"

"Is it really that bad?" I asked nervously "the world is really going down?"

I'd moved out nine months ago to the outskirts of Minnesota to see what I wanted to do with my life. The only life I'd ever known was that of hunting. I'd grown up helping out my dad around the house, staying home with Dean and Sam while John and my dad had been out on jobs, and then answering the phones to pose as FBI heads, etc. for hunters out on jobs. I'd wanted to see what was out there, and my dad had been pretty happy about that. He didn't want me to follow in his hunting footsteps. So when I'd moved up he'd kept me updated on some of the things that were going on in the supernatural world. He'd told me a bit about how Sam had broken the final seal and released Lucifer and now they were trying every which was to put him back in his box. But that was about it, I think my dad was trying to put me off helping out.

"It's pretty bad, Kit-Kat" Sam sighed, using the nickname he'd coined back when I was four and he was ten, "the future is looking pretty bleak".

I nodded somewhat miserably before reaching for another large slice of pepperoni pizza. I felt bad that while I was on some mission to figure out what to do with my life my dad, Georgie, Dean and Sam, and Castiel, their angel friend, were busting their asses to try and save the world. I bit my lip and turned to the two brothers.

"Do you think that dad would be mad if I came home?" I asked them hesitantly "I could help you all out, I'm not totally useless. Besides, I don't really wanna stay here after what happened to Lauren"

"The old man misses your sorry ass" Dean chuckled "he won't say it but he wants you to come back home, Georgie's been nagging on him to ask you to come back"

So, the decision was made. I'd decided to go back to Sioux Falls, at least for a little while, to help my dad, Dean and Sam defeat Lucifer and end the apocalypse. I admit, the prospect was utterly terrifying, but at the same time I was glad that I was going home and back into the hunting business. I'd left home with the plan of figuring out who I was, what I was meant to do with my life. But, while I'd enjoyed the independence of living away from my dad, I'd not found anything that fulfilled me in the same way that hunting had.

Dean and Sam left the following morning in the Impala to deal with some case they'd got wind of. I'd called up my dad and told him I was coming home soon, he'd pretty much grunted at me to let me know it was ok. Georgie had squealed gleefully when I told her, same old Georgie. My dad wasn't exactly open with his feeling, and I guess I wasn't either. I'd hug dad and the boys, and Ellen and Jo other at the Roadhouse, and I'd sit and talk with them all, but expressing my emotions, my real feelings, was a hell of a lot tougher for me. I guess that's what happens when you grow up with a bunch of male hunters who in the emotional stakes were barely one step up from Neanderthals. Then again, Georgie had grown up in the same way as I had but she'd turned out ok in the emotions department. I guess she'd had more time with our mom before she died, maybe that was it. I don't know, maybe I was just a weirdo.

I gave up my lease on my room at the flat, called my boss at the café where I'd been temping for the last couple of months and made up a lie about a family emergency – I guess it wasn't really a lie since technically I was going home to help my family – and having to go back to help out. They were pretty good about me quitting. I spent a couple of hours packing up my crap, piling clothes, shoes, and my book collection into boxes and loading them into the bed of my truck. Dad had bought it for me when I got my licence and, while it wasn't as cool as Dean's Impala, it was my baby. I set off the next morning.

I pulled up outside my family home in the evening, tired from all the driving, and looking a mess. I glanced at myself in the mirror and scrunched up my nose. Yep, I definitely looked rough. While it felt strange to be back home again, it also felt pretty damn amazing too. As I hopped down from my truck I was practically knocked off my feet by my sister. She wrapped her arms around me and squeezed me into a tight hug..

"Georgie" I yelped playfully "be careful, you're cutting off my air supply!"

Georgie stepped back and grinned at me. It had been nearly six months since I'd last seen her so I stepped back for a minute to take her in. Since the last time I'd seen her she'd chopped her dyed red hair into a cute crop. She stood before me in a daisy print sun dress, an array of coloured bangles on her wrist and a pair of tattered flip flops. Looking at her now, you wouldn't think she was a hunter, but trust me, when she was on her job she could be lethal.

"It's good to see you, little sis" Georgie said happily "dad's been driving me crazy!"

"Yeah, well, now he can drive the both of us crazy!" I laughed before turning to gesture at the bed of my truck "are you just gonna stand there? Or are you going to help me with my stuff?"

"Yes boss" Georgie chuckled.

Between the two of us we carried my stuff inside, it was only a few boxes and a couple of suitcases so it didn't take us too long. I set my stuff down in the kitchen and called out for my dad. A minute or two later he rolled into the kitchen from his study. We grinned at each other and he opened his arms to me for a hug. With a smile I quickly stepped forward to hug him.

"It's good to be home, dad" I told him quietly.

"I'm glad you're back" he murmured.

Dad and I sat down at the table while Georgie finished making us all some lasagne which she claimed she'd been lovingly slaving over for the past two hours. Georgie and I were pretty great cooks, I know that sounds like I'm boasting but really I'm not, it's just that when we were growing up we did have to learn to do these sort of things ourselves. Don't get me wrong my dad was a great father to us, but he wasn't exactly skilled in the culinary arts. And since our mom died when I was just a baby Georgie and I had to step up and learn to cook. By the age of eleven I was a whizz in the kitchen.

"So where are we with the whole apocalypse situation?" I asked dad around a mouthful of lasagne.

"We're all still working on it" dad sighed "the boys are still saying no to Lucifer and Michael, we're working on a plan"

"I want to help you guys" I confessed "research, answering the phones, jobs, I'll take anything"

"Team Free Will needs all the help it can get" Georgie interrupted "we'll be glad to have you!"

"Team Free Will?" I mocked.

"Hell yeah! We've even got an angel on our side" Georgie whooped jokingly "you'll love Castiel, Kat, he's so funny, doesn't understand sarcasm in the slightest! And he's a little bit hot!"

"Georgie!" I laughed while dad wrinkled his nose in disgust.

"What? He is!"

I rolled my eyes dramatically before returning to my food. Georgie could be a little bit boy mad in a way, when she was younger she used to have a new boyfriend every week. The sad thing about it all was that she only behaved that way because she couldn't have the one boy she really cared about: Dean Winchester. She'd liked him for years but never once said a word to him, and to be honest I didn't blame her, Dean was a notorious playboy.

After our meal, Georgie and I washed up while dad returned to his study to do some reading on Lucifer. We set my stuff up in my old bedroom and I collapsed into my bed. I didn't realise I had been so tired yet as soon as I put my head against the pillow I was out like a light!