I fought Lucifer as he tried to take full control of my body

"Bitch you tricked me" he realised

"Castiel! The knife, now!" I struggled to form full sentences as I reached out to take the knife that Castiel was holding.

"You think you can kill me witch" Lucifer hissed as I held the knife in my hand.

I grinned "What else do you see in there you bastard? I'm not just a witch" I hissed

"Part Angel" I heard him realise

"And this knife kills Angels, which technically you are"

"It doesn't matter" Lucifer roared with laughter from inside me "I have control now" he forced my body to lunge towards Castiel who struggled to push me back.

"Caitlyn you're stronger than this you can fight him, remember the plan" he pleaded

I saw Sam and Dean stood watching, I could tell Sam had figured it out first "No Cait please" he begged "Don't do this. We'll find a way to get Lucifer out of you but it's not worth you dying over"

Dean looked confused for a second until realization washed over his face. He looked at Sam knowing what it meant if his brother never had to become Lucifer's vessel, then back at me. He seemed to struggle between wanting to help Sam save me and wanting to save his brother. Obviously it was no contest and I didn't blame him.

"Yes she does Sammy" Dean told his brother.

I fought my way to the surface and looked back at Sam "You wouldn't say that if you'd seen what I have"

I felt Lucifer rising to the surface as I struggled to hold him back, just as a demon appeared from nowhere and snapped Sam's neck. He didn't even have a chance to defend himself.

"NO!!" I screamed bringing the knife down into my chest.

I fell to the floor and saw Castiel leaning over me before I blacked out.

I was surprised when I wake up. As I stood up my eyes fell to Sam lying dead on the ground while Dean held him in his arms and sobbed. Then I saw my body still lying on the ground.

"Good work" A voice interrupted me...

"Zachariah" I said "Am I dead?"

"Yes but you don't have be"

"I don't understand"

"Michael sent me"

"What?"

"Well don't look so surprised" he smiled "you are one of his descendents. Don't get me wrong he wasn't happy at first when it came to our knowledge what you were planning but it was too late to stop you"

"Well sorry if I ruined your plans"

"You didn't ruin our plans, sure they changed a little and I'll admit that we intended for Michael to kill Lucifer but a descendent of Michaels is the next best thing I suppose"

"What did you mean when you said I didn't to be dead?"

Well here's the thing, Michael sent me here with a choice for you. You can either get back in your body and I can bring you back to life, Lucifer stays dead and you go on to lead long happy life"

"So what's the other choice?"

"You can come with me. I'll take you to Michael and you become a full angel with all the powers of heaven at your disposal"

"Why would I do that?" I asked

"Because I can bring Sam back, good as new minus the craving for demon blood and he can go on with his life"

"Caitlyn" I heard Castiel say. I'd forgotten all about him standing there

"I'll go with you but can I just have five minutes?" I asked Zachariah.

Yes" he agreed.

"I have to do this" I told Castiel

"Sam loves you" he said looking sad

"Maybe" I replied

"What do you mean?"

"I've always wondered if I made him have feelings for me because that's what I wanted" I admitted

"There are some beings with the power to control emotions like that" he told me "but you are not one of them"

"You mean..." I began but I didn't need to finish the question. It was enough to know that Sam's feelings had been genuine after hiding my doubts for so long.

Castiel nodded.

"I've almost done what I set out to do" I told Castiel "I saved Sam from becoming a monster, now I have to do this one last thing to save his life"

He nodded in understanding "What do I tell him?"

"Tell him that I'll always be watching over him and that I love him too"

I turned to Zachariah "Ok I'm ready"