Pretend Sam came back fine and the brothers are like the good old days and then Castiel pops in with a little surprise and that is where this begins. Starts at the end of Third Man. I have been playing with this idea for a little while so I hope you guys like it. xxx

DEAN'S POV

"Dean, is it just me or has Cas really changed?" Sam looked at me from the passenger seat of my baby. He was right; Cas had given no second thought to torturing that kid. Before the apocalypse, he was almost human. But now, he was worse than when we first met him.

"I don't know what is wrong with Cas. I guess all the men upstairs fighting is taking its toile on him. Look at how we were feeling this time a year and a half ago."Had it really been that long? I had missed Sam like crazy but it seemed like only yesterday we were preparing to face Lucifer. "I guess we will just have to leave them to it. I'm sick of dealing with those self righteous bastards so they can look after their own mess."

"Yeah, your right. It's not like we can actually do anything. We helped Cas finding that staff but we have no idea about the others."

"I'm sure we'll come across them sooner or later Sammy."

I pulled in to the motel we were staying at to collect our stuff and freshen up before we hit the road. I hurt like hell all over but that was nothing new. Sam headed towards the room whilst I got the bag from the back seat. I hadn't really thought about the possibility that Sam and I would get roped into helping the angels again but I could see it happening. I hoped it wouldn't come to that but the chances of Castiel not demanding our help was very slim.

I hauled the duffel over my shoulder and headed towards the door of our room to find Sam standing in the middle of the room, Cas standing right in front of him with a blade. But Sam wasn't staring at Cas, he was looking at the girl lying on one of the beds. She must have been about seventeen with shoulder length hair which was draped over her face. She looked about medium height with a sporty build but it was difficult to tell because she was lying on her side, seemingly fast asleep in jogging bottoms and a baggy hoody.

"What the fuck is this Cas! Have you completely lost your head! Have you kidnapped this girl!" I looked back at Cas waiting for a reply when I noticed there was blood dripping from the blade in his hand. "Have you hurt her! Cas what is wrong with you!" I dropped the bag on the floor by the door and ran to check the girl over.

"Will you please just calm down?"

"Calm down, you..."

"I am trying to explain if you would give me a chance. There is no need to over react." I kneeled beside the bed and examined the girl quickly and carefully, seeing no obvious wounds on her body. I turned to face Cas again, not standing up in case I attacked him.

"You have really went too far this time Cas, first the little boy and now some teenage girl. And you bring her here, too us expecting us to do what. Kill her? Torture her?"

Cas grimaced at this. "I am asking nothing of the sort. Now if you'll let me explain. First the blood on the knife is not hers." He walked over to the table and placed the knife down. I stood up, realising it was one of those special blades that killed Angels, but Angels didn't bleed. "I was following a lead on Gabriel's horn. I never found the horn, it seems to have moved but I found out that the other side was interested in her." He looked over to the bed and I followed his gaze.

What could this girl do, she seemed so innocent lying there. "What would the Angels want with some teenager?"

"Yeh," I had totally forgotten about Sam for a second, now he walked over to sit of the couch across from the bed, sitting with his head in his hands, staring at the girl. "Why would they be interested in her when they have all those weapons you are trying to look for, those things are nuclear bombs to you guys, so why her."

"I didn't know; I'm still not a hundred percent sure. I looked into it. Talking to other Angels; and this is when it gets complicated. I found out why she was so important and so went to her house to...well test the theory and then I found some demon trying to take her away but she is very strong and was very annoyed. I stabbed the demon...but it got away. I was trying to calm her down but she was impossible so I put her to sleep."

"So when you said other side you meant the demons wanted her?" Sam looked confused.

"No, both sides want her. The other Angels and the demons."

"Wow, she is more popular than us at the moment. But me and Sam have been here before and I don't want to have to be fighting off both sides again."

"You might after I explain why they want her, well...the angels want to kill."

"Will you just spit it out dude!" I was really starting to get annoyed at him beating around the bush.

"Well, I never told you this before because there was no need for it, but you Dad did a deal with an Angel. Gabriel in fact, and before you go on one of your lectures about being straight, I never knew what it was until yesterday. Your dad offered to donate his...this is ridiculous I know...but he donated his sperm. I think Gabriel wanted a backup in case you both didn't make it to see the apocalypse. And well, that was seventeen years ago," Now he looked back over at the girl on the bed.

It was Sam who clicked first, "you...you cannot be serious. I mean first a secret brother and now a sister too. No way Cas. And why would he make a deal with a fricking Angel anyway? We never even knew you guys even existed. And why did they not just use her then if that was why she was born instead of hassling Dean?"

"All good questions that I have asked myself but I'm afraid my knowledge is restricted. Maybe they never used her because your brother was easier to manipulate. She does seem to have a very strong character. As to why your dad made a deal, I have no information on that front. Gabriel has kept it very quiet. Your sister's existence had only came to light very recently."

"How can you be sure she is related to us, where is your proof. And what's her name anyway? And where is her mother?"

"My proof is that I spoke to her mother, before she died, which makes this situation even stranger. Her mother, Sophia's mother, was a fallen Angel. She was forced by Gabriel to fall so she could bear your fathers child."

"Bullshit! We don't have a sister."

"Sam and Dean, I would not tell you this if it was not true. You must believe me when I tell you that she is in great danger. She is special, born of both man and angel this alone makes her a prize. And you are all she has left. Sadly her mother was killed by the Demon who tried to take her."

"If she is so special, why not protect her! You're telling me that this poor kid is now being hunted by everything out there and you guys never thought to keep her protected before now! Seriously, you guys are not what you are cracked up to be." Sam stared at Cas with eyes full of disbelief.

"Very few of us were aware of her existence. I have known for less than 24 hours."

"Are you sure she is our sister." I was beginning to believe Cas. I mean just looking at her lying there reminded me a little of Sam. "You're positive."

"Yes," Cas looked me straight in the eye when he said this.

"And she has absolutely no one else."

"Her mother is dead. She was an Angel meaning no family. You are her...next of kin as you people put it. Also you will be able to protect her as she is, as you put it earlier, more popular than you."

"Well Dean, I think it's time to pay Uncle Bobby a visit."

Well, there you have it. Please let me know what you think. The more reviews I get the quicker I will try and update the story. Thanks xxxxx