"Cas!"

Dean hadn't seen the demon come from behind Cas, already struggling with his own son a a bitch to fight. He noticed a second too late the shinny sliver blade just before the demon stabbed Cas in the back, in front of his eyes.

What was happening?

After killing the demon in front of him, Dean went deaf for a second, the sounds muffled and his vision became fuzzy. Fear and dread filled his mind at the thought of Cas. Cas hurt. Cas dying.

No. He wouldn't let that happen, he wouldn't-

Standing still, he saw Sam running closer toward Cas' body, silently and slowly falling to the ground. Sam called his name, trying to make him react in any way possible but Dean couldn't move. He just watched Sam trying to catch Cas in his fall, dirt now covering his clothes and his trenchcoat.

"Dean..."

He suddenly heard his name. Not from Sam yelling at him, but from Cas. He managed to hear the faint whisper despite everything else. And then everything came back to him in one second. The voices, the whispers, the hisses of pain, the blood. The blood everywhere.

He had to move. Now.

Dean found himself running to them, but his knees gave out as he approached his brother and his... and Cas. Taking a deep breath to try to calm his mind he realized he had made a big mistake when all he could smell was death and blood.

"Cas. Cas, buddy, it's fine it's okay. We're gonna get you outta here. Sam let's go"

But his brother wasn't moving. Just staying there, hands on his knees, a defeated look on his face.

"Dean. He was stabbed by an angel blade. We have no cure for that."

The truth of his words sounded so wrong in Dean's ears. No, there's always something we could do, we could-

"Dean..."

This gravelly voice again. Dean's look turned down to the speaker and he found it unbearable as he saw Cas' weary face glancing at him, thick red blood coming out of his mouth and Cas' hand, heavy and shaking coming to take his own in a tight embrace.

"It's alright Dean"

This is when Dean noticed the light glowing and expanding underneath Cas' skin.

"Cas come on, please, wait!"

With a slight tilt of his head, Cas, oh god, smiled, a slight curve forming on his lips.

"Cas please, don't do this, don't do this. I don't have enough time I can't-

His voice dropped when he felt Cas' fingers on his lips, silencing him.

"It's okay Dean. I know, I've always known"

He knows. Oh god he knows. If only he hadn't been that stupid, if only-

"I'm sorry Cas, I'm sorry"

"Cas started coughing, his breath heavy and slowing. The light started to glow again, with much more intensity, and Dean knew it was the end. There was nothing he could do now, right? It was too late.

"Close your eyes Dean. Dean..."

Light started to emane from the Angel, blurring slightly his features, his head going to rest in Dean's arms as Castiel released his last breathe, still staring at him with his bright blue eyes where had now vanished any signs of life.

couldn't be was just a nightmare, just a nightmare.

"Cas?" He heard his own voice break at the sudden rush of pain in his guts. He couldn't breath. God, he couldn't breath.

"Cas! No. No no no come on man. Stop it buddy, wake up now. CAS WAKE UP!"

He hadn't meant to scream but this white light was getting too intense to keep his eyes open, but it was taking Cas away and now he could barely see his face anymore. And he didn't want to let go, he just couldn't let him heard something, screams, maybe coming from Sam? He didn't know until he had to take a deep breath, his throat burning and his heart clenching in agony, and he realized he was the one screaming Cas' name.

"Please don't do this to me come back COME BACK. I love you please, please Cas I'm sorry I'm sorry"

He felt a hand try to take him away form the body, but Dean didn't want to move. The last thing he saw was again these ocean blue eyes, looking up at him, the last thing he saw before his closed his eyes under the burning of the light in his bones, on his body, and in his heart.
When he opened his eyes again, everything was still. The silence was heavy. When Dean opened his eyes again, he saw dark, blue, giant and beautiful wings craved in the concrete, and Cas' lifeless body resting on the ground.