Sam opened his mouth and the Doctor shown a light inside of it. The Doc studied his throat a moment before clicking the light off. Sam swallowed tiredly.

"How are you, Sam?" the Doctor asked.

"I'm fine." Sam said.

"They tell me you're getting worse." The Doctor said, tilting his head, "Are you hallucinating?"

"I-I…" Sam stuttered.

"More than a voice? Are you seeing things, Sam?" the Doctor asked.

"I…" Sam scratched the back of his neck, shook his head and scoffed, "Look… I know it's not real."

"Are you sure?" the Doctor asked.

Sam frowned, "Of course, I'm sure."

"I mean…how can you tell the difference?" The Doctor's face morphed into Lucifer's smirking one. Sam's eyes widened and he backed away.

"Just leave me alone." Sam breathed. He turned his back to the hallucination and walked around to the other side of his bed.

"Aw, Sam we've been through this." Lucifer whined, "I'm not going away. Not ever. I'm part of you, Sam."

Sam grimaced and shut his eyes, "No. You're not." He said.

"M.F.E.O. Sam. Remember? I'm your other half." Lucifer said.

Sam clenched his fists didn't answer. Just ignore him…he's not real. He isn't really here.

Although it was getting really hard to decipher between Lucifer and reality when the hallucination kept appearing as other people.

"I'm a piece of you. You're not getting rid of me." Lucifer added, "I've been inside your noggin' for months now."

Sam laid on his side, keeping his back deliberately to Lucifer.

"Besides, I like it here." Lucifer remarked, "And you don't want me to go. Not really."

Sam heard a hiss and he knew Lucifer was lighting a firecracker.

"Allllll this time. And you still haven't asked me why I'm here." Lucifer mused. He threw the firecracker at Sam and Sam flinched when it exploded.

"Stiiiiill ignoring me. Aw, come on, Sam. I know this silent treatment is just a cry for attention. I get tired of these one-sided conversations."

"You're not real." Sam said aloud.

"But you wish I was."

"No. I don't." Sam growled. As much as he wanted to pretend the hallucination wasn't there, it was seriously getting on his nerves.

"You don't really want me to leave. It would make what you did that much worse." Lucifer replied.

"What I did?" Sam finally looked over his shoulder.

Lucifer nodded. "Yes. What you did, Sammy."

"You mean save the world and lock you up?" Sam snapped.

"No. And yes. I mean, you did do that, but that wasn't the worst crime you committed." Lucifer replied. He was picking at his fingernails.

Sam turned over and grit his teeth. Just ignore him…Sam thought, he isn't real. Ignore him…it's all in your head…

"You left me. All. Alone. You didn't even say goodbye. You were just –" Lucifer snapped his fingers, "Gone." Lucifer was suddenly on his bed. He leaned uncomfortably close to Sam's face and Sam couldn't help but look into the cold blue eyes. He felt a chill go down his spine at the hated he saw there, "You abandoned me. After all I did. After everything I did to protect you. You just. Left."

"Protect me?" Sam croaked. Lucifer laughed cruelly and pushed himself off the bed.

"Yeah, but that's really hard to swallow, isn't it? That maybe I wasn't the bad guy. That I wanted to you to actually be happy. That's too much for a Winchester to handle. No, everything's gotta be black and white. I mean, I'm Lucifer, right? There's no way I'm not the ultimate evil. It'd be so much easier to cope if the creature you left in Hell deserved to be there, right?" Lucifer leered, "You really think I'm the reason you're going crazy? No, Sam. This is all you. You don't want me to leave, because you know deep down you deserve what I'm doing to you."

"Stop it." Sam said.

"I tried to protect you. Granted, I wasn't always successful. The Cage pulled you away and tortured us both. You know it. I know it. But you made the pain a little more bearable, and sometimes I was able to shield you from it. I shouldn't have. You were just going to leave me. But I didn't know that. All I knew was that my other half was suffering and sometimes I could stop it. Or at least, use the last of my strength to heal you…" Lucifer trailed off.

"You're lying." Sam said.

"I did all I could. I tried my absolute hardest. Because you were the only thing that kept me going. Remember when I told you that? How you were my only hope?" Lucifer asked.

Sam stared intensely forward, trying to block out the hallucination, "Bullshit…" he whispered.

"Remember when I would sing to you? You don't want to—it was what I did to comfort you when I couldn't reach you any other way. But I did try. Which was more than you ever did for me. Remember how I cried for you? How I apologized and tried to comfort you? How distraught I was that my Hell was ripping you apart? I'm a lot more protective than people give me credit for." The angel scoffed, "As if I had anything to be sorry for. You're the one that pulled us down there."

"I would try to teach you Enochian to distract you." Lucifer went on, "I made you repeat the words so you had something to focus on besides the pain. I told you the lessons distracted me as well, made my existence in the Cage more bearable…"

Lies. Sam thought, although something in his gut was twisting uncomfortably.

Lucifer scoffed, "To think I fell in love with someone as selfish as you are." Lucifer tsked, "But there's a way you can fix it, Sam. There's a way I won't be alone anymore." Lucifer appeared in Sam's view again. He extended a thumb and forefinger and placed the finger-gun underneath his chin, "We can be together again."

Sam's gasped in horror.

"Come on, Sam. Do you really think the white and pearlies are gonna open for you? Nah, you're going somewhere a lot warmer…" Lucifer explained.

I couldn't….Sam thought, panting. Besides, there aren't any guns around here…

"Ever heard of a bedsheet noose?" Lucifer murmured next to Sam's ear.

Sam shuddered and Lucifer chuckled.

The devil was telling him to kill himself.

So he would go to Hell.

And why? Because….because Sam felt guilty? There was no way that could be true. Lucifer tortured him in Hell. All his hallucinations pointed to that.

"Do they Sam? Did you ever specifically see me, stringing you up on hooks and chains?" Lucifer asked.

"I heard you laugh." Sam protested.

"You sure it was me?" Lucifer asked.

Sam shut his mouth. Lucifer laughed cruelly, "Come on, Sam. Ask me something else. Justify your skewed view of me. Act like you didn't see me hanging next to you in the Cage."

Sam recalled the hallucination he'd had where he dangled from a chain. The dark figure next to him. It couldn't be. It wasn't—

And the bloody wings in the bathroom. The seared, dark feathers…

The serrated, iron stake that shot through Lucifer's chest and into Sam's…

Because Lucifer had been blocking it.

No. No. No. This didn't make any sense. There was no way—

"'Search your feelings.'" Lucifer said with a wink, "You know it to be true. And you deserve it. Everything I've done to you. You deserve it completely."