"Wait, the blood of a former wielder of the First Blade..." Sam paused for a moment, as if to think. "Cain! We could ask Cain for a vial of his blood!" Castiel hated to burst his bubble (as Dean would have said) but-

"Cain won't agree to this, remember he said that if Dean ever came back to him, he would kill him on the spot."

"But won't he want to help Dean? Also Dean promised to come when Cain called and kill him with the First Blade, if Dean is a demon he won't come when Cain calls." Sam argued. Cas had to admit though he did have a point.

"Do you want me to "zap" us there?"

"No, we'll go by car."

"Why it will be faster if I got us there."

"It would drain your stolen grace, so no!" Cas sighed in exasperation, how had Sam guessed about his grace. It was so like the Winchesters to think of others even when they had more important matters at hand. He knew that Sam was right, but lately when he had used his powers he didn't feel so drained so maybe the grace was becoming a part of him. It was possible, or the grace just had next to no energy so Castiel was already a dead man. But he couldn't think about that now. Instead he touched his fingers to Sam's head and teleported them both to where Dean had said Cain lived.

When they got there, the first thing Cas saw was a normal-looking house with bee hives scattered around it.

"Cas!" Sam was staring at Castiel accusingly.

"Come on lets go." Cas pushed past Sam, not in the mood to explain his actions, and walked towards the house in front of them.

He saw a middle-aged man sitting on the houses porch, looking like he was lost in thought. Cas assumed that must be Cain. They approached the man, and he looked up like he had been expecting them.

"Its happened hasn't it." It was more of a statement then a question.

"If by its happened that you mean that my brother has turned into a murderous demon, yeah its happened." Sam looked angry, like he felt this man was responsible for all his problems. Castiel supposed he understood that. Cain had been the one to pass on the Mark of Cain unto Dean, which had in turn changed him into a murderous knight of hell.

"And now you want the cure." Again it wasn't a question. Why, Castiel wondered, did Cain keep asking questions he already had the answer to.

"You're damn right we want the cure! You knew this was going to happen!" Sam was shouting now "Now all these people are dead, and more importantly my brother's soulless!" Cain stood up.

"You're brother practically begged for the Mark of Cain! If you had come with him, instead of going on and on about how he wasn't your brother this wouldn't have happened!" Castiel felt shocked, how did Cain know all these things, from the look on Sam's face he was wondering too.

"How do you know that?" Sam asked

"I have my sources. And just so you know I will give you a vial of my blood, not because someone wrongly accused me of it being my fault, but because no one deserves the fate of being a knight of hell." To strengthen his point Cain pulled out a knife and sliced hi arm open. He then proceeded to pull out a vial from his jacket's pocket. He filled the vial with his blood and held it out to Castiel.

Castiel put the vial safely in his trench coat's pocket, he looked at Sam's face which seemed to be frozen in shock.

"You-you just have a vial on you, just like that?" Sam stuttered out. Cain threw his head back and laughed, which startled Cas immensely, Cain didn't seem like the man to show emotions easily.

"You're a funny one, Sam Winchester. Now you better be going, so you can administer that to that brother of yours." Castiel nodded his thanks at Cain and transported himself and Sam back to the bunker. He winced, feeling his power go out of him, but it didn't hurt that much. Maybe the stolen grace really was becoming a part of him.