Chapter Text
“Maybe you could fight the Mark for years. Maybe centuries, like Cain did. But you cannot fight it forever. And when you turn, and you will turn. Sam, and everyone you love will be long dead, except for me!” The Mark started throbbing, kill, kill, kill, kill! But a different kind of hunger had taken over, after waking up as a demon and knowing the reality of his feelings. Being a demon really helped Deans clarity. The crisp and clean, core emotions underneath the “fuck if I care, I don’t have feelings!” There was a clear difference between Sam and Cas. One he never noticed when he had only his complex humanity to fall back on. He had always had the strongest urge to protect Sam, a brotherly love, shield and defend. It hadn’t been all that surprising and keeping the Mark at bay on in some semblance had been kill, kill, shield, defend, kill, defend! Kill, kill, kill! Shield, protect and defend!” Cas had been different, it had been such an urge, the kind that even the demon couldn’t keep at bay. Protect, posses, own, MINE! Dean had never felt that way on everyone and being human again, he didn’t know what to with it. But to keep the Mark at bay, he couldn’t do anything then repeat it on loop. Kill, kill, mine, mine, mine, he’s MINE!
Before Cas could finish his speech, Dean was gonna start a whole other conversation. He had Cas where he wanted, back against the wall, forearms had his head boxed in. Leaning in close, looking at his sky-blue eyes, who were wide and uncertain. “If you were the only one there, if I’d murdered the whole world, everything except you. What would you do Cas?” Dean couldn’t help it, he started growling, he had to nose that beautiful, tanned neck. It was as is if his mark could be replaced with the truth. There was no serenade to kill, but the Mark sang so beautifully to him right now. It was as if Cas heard it too, because it strengthened his resolve.
“Are you asking me how low I’ll go to follow you Dean? Because I think my actions speak louder than any words I could come up with. I’ve been to hell twice for you, once to save you, once to make you happy and your brother safe. I’ve been to purgatory I gave up an army for you. I rebelled for you, Dean. Ask me again. Ooh.” Cas ended with a gasp, Dean couldn’t take it anymore, he bit in the space between his jaw and throat. Growling softly. Mine, mine, mine possess, mine! Dean had pulled him roughly in a kiss and Cas? Sweet bliss Cas opened up to him beautifully. “Even if I want this,” he asked gruffly and Cas nodded vigorously, “even if I will take you as mine, as you will spend millennia after millennia, with only me to touch. Never without a love bite from my mouth, ready to be fucked and sucked and loved up at any point in time. Forever, because I will never, ever get enough of you Cas. Nobody will even be allowed to look at you if you say yes, please, please angel tell me yes. I’ll take us away and we will never ever need anything else, Castiel please!” The angel shivered against his body and if he wasn’t plastered against him, he wouldn’t have heard the quiet whine under his breath. “Yes, take us away. Dean, Dean, my Dean, my dragon, my love, please!” Too many clothes, they were too many clothes, and he didn’t have enough mouths or hands.
“Would you love me if I was a demon?” Asked Dean, as he started licking his way, from his jaw to his collarbone. “Yes!” Cas panted in his hair, leaving his hands all over his body, trying to map every last patch of fabric and skin. “Would you love me if I had killed you!” Hands started gripping his flannel, trying to hold on. “Yes always, Dean! A-ahh.” That stilled him, Castiel was sincere he knew that, it left them panting, Deans head on his chest, Cas’ hands gripping his hair. Son of a bitch, had he always been a monster, or was Cas just completely addicted. Was everyone right, had Dean ruined this beautiful creature, before he even owned it? “Dean?” The sound utterly crushed him, small and afraid. “Please, please, I’m sorry.” Dean arched his back, dug his hands in his angel’s curls and tried to completely surround him. “I got ya now, sunshine. I love you, come lay down for me baby, I’ll take care of you.”
And when he lay him down carefully on the map-table, Dean found his sole piece of paradise, his bliss.
The mark sung beautifully, thrumming with their heartbeats, intertwining with his angel’s grace and breaking the strongest lock in the multiverse neatly in half.