#levi!cas

“I—I don't know w—what you want,” he managed to get out around the lump that had settled in his throat.

He had never felt so much fear of a creature. Maybe it was that he wore Castiel's face. Maybe it was the glazed expression of glee. Maybe it was the 'thwumping' sound as he slid under the surface, sending dark shapes into the water supply before surfacing, turning and gliding back to shore.

Dean wasn't sure, he didn't care. But this creature, the Leviathan, was terrifying. It had his stomach churning and his heart thumping. His nerves were bared electric wires in a rainstorm.

“Oh Dean. That surprises us. We've made it so clear.”

The creature's voice was awful; multi-layered, harsh and smooth, high and low, evil and humorous.

A smile touched his lips; lips that used to belong to Castiel, who had taken them from Jimmy Novak. Dean felt sick.

“And, Dean, you are so very clever. How could you not know?”

He took a pace closer to Dean, the face of the angel he knew so well wild and distorted by the creatures that resided within him. If you disregarded the blackened tracks of oil-like-blood under the surface of his skin, you might think his smile genuine, but it only made Dean shudder.

He already missed his best friend, his angel. Castiel.

“We want you Dean. We always have.”

The words, sounding in concert from one throat sent a shudder through Dean, both joy and revulsion. But the smile on the leviathan's lips was wrong. It felt like a trap.

Castiel would never want him.

Not the way he wanted Castiel. He knew that, had always known that.

“Dea—“

The leviathan’s words were cut off by the sharp report of a gun.

Smoke drifted across Dean's vision as a black hole appeared on Castiel's forehead, right between the eyes, blossoming with oozing, rancid filth.

“Th—thank you S—Sam,” Castiel, the true Castiel whispered. He fell to the ground, violent orange lighting him up from within. Not bones, but swirling sludge glowed through his skin.

He was nothing more than a heap of unmoving, slime covered, empty angel vessel.

“C—Cas,” Dean whispered, watching the light in the angel's eyes fade, fade to nothingness.

Castiel was gone.

And Sam had killed him.

Dean rounded on Sam, fury like rocket fuel coursing through him.

Sam stepped back. “I— Crowley. He—he had the Colt. I—I didn't think it would—“

“Dean.”

Dean spun on his heel, his brother forgotten. He was at Castiel's side in two strides. He dropped to his knees in the foul smelling black liquid that had flowed freely from Cas’ nose and mouth, the wound in his skull. It had stained his sodden shirt and skin black.

“Cas?” he whispered. He lifted Cas’ head tenderly in his arms, terrified of hurting him more, terrified that Cas would leave him for good.

“They—they weren't wrong.” Castiel coughed. His lucid blue eyes rolled up to meet Dean's, completely him once more. “I—I thought I had made it clear,” he broke off, closing his eyes and stilling for a long moment, making the breath catch in Dean's chest.

Cas blinked his eyes open again and Dean sighed in relief. “All this time, I thought I'd made it obvious.” Dean was shaking his head, not comprehending. “I fell for you Dean. Everything I've done, I've done for you. I love you Dean Winchester.”

Dean frowned and swallowed. This—this couldn't be real.

Castiel looked up at him, beseeching. His eyes were a different blue than Jimmy's had been; ethereal, glowing.

“I love you,” Castiel said, this time, choked and desperate. His eyes dropped as he coughed, black spatters staining his lips.

“O—Oh. Okay. Okay.” Dean nodded.

His heart felt as if someone had taken it up, was clutching it in their palm, squeezing gently.

It felt warm.

He stroked his hand through Castiel's wet, flattened hair, but spoke to Sam. “We need to get the bullet out. Now.” He could see that livid orange glow behind Cas' eyes, beginning to kill him as well as the God forsaken Leviathan.

“You. You are not allowed to leave me,” Dean told Cas, leaning down and pressing his forehead against Cas' hair. He touched his lips to Cas’ skin, bloody and blackened.