A/N: Because it might matter, I wanted to share the fact that this fanfiction is set in season seven. However, the leviathans probably won't be mentioned... and a lot of other plot points won't be mentioned either. This fic differentiates from canon, and I'm going to exclude the stuff that probably won't be important to my plot.

But basically where this story takes place is a little while after the halucifer arc. Cool cool?

"Christo."

She flinched.

The rest was instinct. Sam drew Ruby's knife, and pinned Lindsey against the wall, holding it against her throat.

Lindsey's eyes turned black and she grinned at him, "I was wondering when you'd find out."

Sam scowled at her, "How long were you—"

"Oh, the whole time. Let me just say you are fantastic in bed, Sammy."

He pushed the knife closer to her throat, "Why? Why did you kill Ms. Taylor? Why pretend to be Lindsey?"

"You don't get it, do you?"

"Answer me." He growled, piercing her skin. She hissed as the blade burned her.

"You're supposed to be our leader, Sam. The boy king. You've always been one of us. Hell, even your brother knows it. You're not even human…" She grinned, and then laughed, "You can't run from fate."

"I've done it before. Lucifer's in the cage, if you've forgotten already."

"Is he? Are you sure?"

Sam faltered, "You're bluffing."

She chuckled, "Why would I say that if it wasn't true? The cage is open again, Sammy…"

"…What?"

"Lucifer is free."

"I'll just beat him like I did last time then!" Sam shouted, but his voice was unsure.

"Good luck," She laughed, "Tell me, Sam… do you remember what happened after your brother texted you last night?"

"I went to sleep."

"Ooh, so close. Lucifer was in control of your mind then, Sam… you're his vessel. And you'll always be his vessel!" She laughed wildly, and Sam felt something brush against the back of his head. He began to grow dizzy, and his vision blurred. The world didn't seem real for a moment.

The blade fell out of his hands, and Sam fell shortly after, collapsing onto the ground. Two people stood above him. Lindsey… and someone else… he knew that person, why couldn't his eyes just focus!?

His eyes began to close, though he tried everything to keep them open. This couldn't be happening.

It just… didn't make sense.

Nothing made sense.

He opened his eyes. The first thing that he registered was the stench of blood. But as his eyes adjusted to the dimness around him he began to stand up. His breathing became laboured when he grasped what was going on.

There were hundreds of them. People he didn't even know. All of them dead. Their mangled corpses lay over one another and a dripping red knife was in Sam's hand. He gripped it, staring at what had happened.

At what he'd done.

He heard a voice then, Lucifer's voice. I'm so proud of you, Sam.

You'll always be mine. Sam clutched his head resisting the urge to shout at him, that he would never be his. This had to be a nightmare.

It felt like the cage.

…The cage?

His eyes widened. What if this was all a hallucination? It couldn't be true, after all. It's his mind playing tricks on him- perhaps Cas hadn't fully gotten rid of the hallucinations that had corrupted Sam's mind only a short time ago.

Sam pressed his nail into his left palm. For a second, the scent of rotting corpses disappeared, and in its place was the smell of books, and of dirt. It didn't stay long enough for Sam to connect it to anything, and was soon brought back to what he believed to be his hallucination.

He pressed his palm harder, nearly breaking the skin with his nail. This time he saw Dean lying among the corpses in front of him. He ran towards him, nearly tripping as he did so, but his brother's image disappeared just as quickly as he'd appeared.

What are you doing, Sam? Don't you get that there's no getting rid of me?

He didn't say anything, and looked around. If this was a hallucination, then there had to be at least something real. A way for him to climb back to the real world. Even the tiniest little thing… A frail rope can be a golden staircase to those who need it.

"I'm sorry."

Sam whirled around. That was Dean's voice. But where had it come from? He stepped over the bodies, trying to find a wall. He had to be either underground or in some sort of windowless building. Either way that wasn't good for him, and if Dean was somewhere here, he had to find him.

He had to get to his brother.

"Dean!" He shouted, and his voice echoed back to him, "Where are you!?"

Sam, your brother isn't here. It's just us.

He ignored the voice, "Dean!"

There was no response, but Sam didn't give up. He kept calling out for his brother as he looked for a wall. Finally, he hit a hard surface with his elbow and he immediately pressed his hands up against it.

The wall was smooth. It was some kind of cold, soft metal. It felt real. The bodies however, couldn't be. There was no way. Sam pounded the wall with his fist, and a sharp clang resounded from it. Sam took the knife he'd been holding, and then drew a long jagged line in the metal. He ran his fingers over it, memorizing the texture.

Sam let his right hand linger on the wall as he began to move. He walked forward, waiting for some sort of bump in the wall indicating a door, or a turn. After a few minutes he reached the far right corner and turned left, still keeping his hand on the wall.

He turned three more times, and eventually, his fingertips brushed over the serrated line he'd left in the metal; he'd reached the part where he'd started. His hand curled into a fist.

He took a deep breath, annoyed. Come on; there just had to be a way out. Where the hell was he?

"Dean! If you're here, answer me!"

And, just as before, he got no response from his brother. Instead, he heard Lucifer.

You killed him, Sam. You killed Dean.

"Shut up."

Oh, finally acknowledging me, are you? You know I could take over at any time…

Sam took a sharp breath, deciding not to respond.

I can show you…

Sam felt himself grow dizzy. He lost control of his body, but he could still see everything. He held up a hand in front of his face, and flexed his fingers.

"See Sam? If I were a hallucination, would I be able to do this?" He spun around with a wide grin on his face, "I'm back Sam, and there's nothing you can do about it!"

He still didn't believe it. It wasn't true. It couldn't be… he had to get out of here. He had to find Dean—

"Dean's dead, Sam!"

He's not.

"Oh, but he is. Why are you so stubborn?" His voice sounded annoyed, and he crossed his arms, "I'd show you, but I'm pretty sure there's nothing left of his body, we tore him into so many pieces. After all, I don't need him."

This isn't real.

Sam fought back with all he could, trying to regain control, and Lucifer just laughed, "I'll give you control back, but you can't cast me out. I'm right here with you, and I'll always be with you. You're mine, Sam."

Sam felt his head clear, and he took a few deep breaths. What are you going to do now, Sam?

He held up the knife he'd used to scratch the wall. Are you going to kill yourself? That would be useless, Sam. I'll still be keeping you alive.

He shakily lifted up his left hand as well, face up. He poised the tip of the knife over it.

Sam, stop. You'll just be hurting yourself unnecessarily. Lucifer sounded confused.

Sam gripped the knife, and then slammed it down into his hand.

He let out a sharp gasp of pain as the metal embedded itself in his palm. He scrunched his eyes shut, and when he opened them… the view was entirely different.

He was lying in some sort of basement, but it was littered with catholic memorabilia: crosses, paintings, and religious books lined the walls. He took a quivering breath. What had just happened? Hell, what was going on now?

Lucifer's voice was gone.

Sam tried to get to his feet, but realized he was tied up—that and the pain in his hand was gone. Why was it gone? He craned his neck, looking around a bit more.

Dean was laying on his side a few metres away from him. His eyes were closed and he was sweating profusely, muttering something.

Sam tried to focus, to hear what he was saying.

"I'm sorry Sam…" He said softly, "I'm sorry."

"Dean!" Sam shouted. "Wake up!"

Instead, Dean just shuddered, and continued muttering.

"Come on Dean…" Sam took a quick breath and looked around a bit more. There was a large doorway to his feet. It was open, and there was a spiral staircase leading upwards.

Why were they being kept here? Just what was going on? Sam tried to get out of his bonds, but whoever did them knew what they were doing.

Sam struggled against them to no avail. He couldn't get out. Come on, there had to be something… He froze.

He could hear footsteps coming from the floor above him.

A/N: And there we go, maybe part of the mystery of what's happening is clearer, but perhaps not. Next chapter if y'all are still confused I'll explain what happened to the Winchesters.

What do YOU guys think happened?