Dean watched the door of his room from where he sat on his bed. He could hear Cas throwing shit around in his room and raging, but he couldn't make out what was being said. It had been going on since supper. Dean closed his eyes, hoping that the trick he had been using for the last month would work again to calm Cas.
"Cas, I need you. I need you to be here with us. You promised. You can fight this. I know you can fight this, man." He prayed under his breath. Something else crashed against the wall in Cas's room and Dean winced. "Just fight it. You're stronger. I know. Please, Cas." He focused on the pain he felt as he pleaded with the angel. His eyes snapped open when a scream of frustration sounded throughout the Bunker.
"STOP IT!" Cas yelled into the air. Dean set his jaw and stood. He heard Sam's door open then moments later Sam was knocking at Cas's door.
"Cas, buddy. It's okay. We're here. Tell us what we can do, man."
Dean couldn't hear a response through his door so he stood and opened it. As he stepped into the hallway he saw Sam in front of Cas's door. He saw the door open before Sam could knock again and then Cas emerged from his room. Dean barely registered the glint of steel before there was a gasp from Sam as he and Cas careened backwards into the wall and fell to the floor. Cas stared down at Sam before standing. As he got to his feet, he removed the long angel blade from Sam's abdomen.
Dean stared in horror, not comprehending what had just occurred. He looked at Cas and there was nothing there of his best friend. Cas sneered down at Sam as Sam tried to press his hand against the wound.
"Sammy?" Dean called, finally shaken from his haze as Sam gasped in pain. Cas snapped his focus to Dean and Dean took a step back at the hatred painted there.
"Cas, it's okay."
"It's not okay, Dean. You don't understand. You never do. You're just a dumb grunt that is only good for mediocre sex."
Dean tried to ignore the words, let them wash over him. But how long has he thought that? "Cas, I don't want to hurt you. Let me help my brother."
"No, Dean. I don't want to do that. He can bleed there." Cas motioned to Sam with the blade and it flung drops of blood against the wall over Sam's head. "All you two ever do it screw everything up. The world will be better off without the Winchesters."
"You don't mean that." Dean said as he tried to stalk around Cas, who was blocking the hallway. He held his dripping angel blade to the side in a loose grip, but Dean knew that laid back look was deceiving. Cas was deadly as hell.
"You should know better than that." Cas growled before he launched himself at Dean. Dean ducked under the swing and immediately spun, lashing out with his fist only to have it blocked by Cas's arm. Cas reached low to deliver a punch but Dean danced around it and spun out of the angel's grip. Now Dean was between Cas and Sam, which is where he should have been from the start. He glanced back at his brother, who was breathing shakily and trying to hold the wound on his back now as well. Shit.
Motion caught Dean's eye and he barely ducked as the angel blade cut the air where Dean's chest had been. He roughly pushed Cas away and repositioned himself in front of Sam. Cas looked up with dead blue eyes.
"You should know how this will end. You won't kill me. You chose me over your own brother. "
Dean clenched his jaw and stared Cas down. He refused to play the mind games Cas was throwing. This isn't him. Cas lunged again, this time catching the front of Dean's t-shirt enough that it ripped and left a bloody scratch down his front. Dean jumped back but Cas recovered and followed, throwing punches with both hands and lashing out with his bare feet. Dean could see the wound on Cas's stomach was bleeding again. He made himself focus as Cas almost stabbed him again.
Sam started sputtering from his spot against the wall. He called out for Dean, but there was no way Dean could get to him. With a cry of anguish he shoved Cas back and stalked forward. This needed to end. He grappled for the angel blade for another minute, both landing punches and kicks. Dean's eye was swelling and his lip bled enough to coat the inside of his mouth. Cas was breathing raggedly but was otherwise seemingly fine. Suddenly, Cas's knee to Dean's crotch made him see stars. He dropped to one knee after managing to shove Cas back again.
Cas brought the angel blade downwards towards Dean who reacted instinctively and used his crossed wrists to block it. In the same motion, Dean lunged upwards and took hold of the blade. He wrenched it from Cas's grasp while pushing the angel backwards against the wall opposite of Sam. He used his taller frame to pin Cas against the wall. Cas used his hands to push against Dean's arms, keeping the blade from piercing his skin.
"I don't want to do this, Cas." Dean managed to say as Cas pushed against him. His heart raged at him while his mind told him Sammy wasn't going to make it if this didn't end. He felt Cas exhale and he looked up to meet Cas's sky blue eyes. His face was a mask of pain as he looked at Dean.
"I still love you, Dean." Cas ground out roughly before the pressure of his hands disappeared and the angel blade slammed into his chest so hard it hit the cement wall behind.
"NO!" Dean yelled as blue light flashed in Cas's eyes and mouth, flickering several times before the burnt image of Cas's dark wings painted the wall like a decoration.
"No, Cas!" Dean yelled again, yanking the blade away and throwing it as he caught the limp body. He gathered Cas in his arms as tears blurred his vision. Before he was able to let out the sob that was building, a weak voice called out his name.
"dean…." Sam said softly, reaching his blood soaked hand to his brother. Dean sobbed once as he struggled out from under Cas's body and crawled across the hall to his brother.
"I- I got you Sammy." Dean said through his tears as he lifted his little brother. "You'll be okay." He whispered as Sam went limp.
