There was a small chapel of sorts within The Bunker. It took Sam a while to think of a sin to confess, but when he confessed it, he bolted out of there. He grabbed a syringe and a knife from where he and Dean stored them. He ran past his brother. "Whoa, Sam! Where's the fire?"

Sam flipped the knife in his hand. "I'm going to finish what I started. It'll be one less thing to worry about..." He didn't see the look of terror on Dean's face, and ignored Dean's panicked calling to him. He was going to set things right. Or at least one thing...

~0~

"You're going to finish the cure? Won't that kill you?" Crowley asked when he saw the knife and syringe. "Well, I'm not doing the trials anymore. It probably won't kill me. Besides, maybe it'll be easier now. I mean, you already have some of it in your system. And I don't know if it affects my blood, but I became a born-again virgin..." Crowley raised an eyebrow. "...Long story. I'll tell you later..." Sam said, leaving it at that.

"If you're fully human, maybe it'll curb your addiction... And if not... I can help you..." Crowley leaned on the desk as Sam drew blood into the syringe. Crowley tried not to look at it. "You? My sober companion? Taking me to Bloodaholics Annoymous meetings?" Sam chuckled as he made his way towards Crowley. "I don't think BA meetings exist, but yeah. I'll help you..." The demon tilted his head on instinct. Sam swore he saw him smile.

He held the syringe to Crowley's neck and inserted the needle into a vein. He pushed down on the plunger, beginning to empty his blood into the demon's.

And that's when it all went wrong.

~0~

The blood never burned like this before. Crowley let out a bloodcurdling scream. It was too much. He hissed; "Stop it, Sam!" Sam all but ripped the syringe out, it still quite full. Sam was bewildered at what was happening. "Crowley, you're neck is burning..."

Crowley panted. "I KNOW! You used the wrong blood! This is..." He winced. "It's ANGEL blood, Sam!"

Sam stepped back. "Angel blood? How can I have angel blood? I... Unless..." Sam pressed his hands to the sides of his head. He cried out in pain. Crowley saw Sam's eyes changing between solid electric blue and their regular hazel with each of the distressed hunter's blinks. In fact, his whole body language shifted with each blink: from Sam's to something Crowley hadn't seen. The angel.

"HOW DID YOU GET IN HERE?" Sam shouted.

"Sam, you need me in here. You are too weak. Dean asked me to..." The angel in Sam replied.

"GET OUT!"

"Sam, you will not survive! Don't..."

"I SAID "GET OUT"!" Sam shouted, tears in his eyes.

"SAM!"

Sam cried out in agony. There was a flash of light. Dean opened the door and entered the room. Sam swayed, stumbling towards the door. "Sam, look, you gotta understand..." Sam froze by the desk, bracing himself against it. "Sammy?" Dean asked.

Sam collapsed.

"SAM!" Crowley cried out.