They have a strenuous-not-really-friendship. For some reason, Dean ends up in Cas’ apt one night. Cas thinks, “I’ll just ignore him and let him sleep in the guest room.” But he joins Dean on the couch, and then Dean nods off, and Cas is all, *insert cuddle excuse here*
They spend all their evenings like this: retreating after dinner to watch some crap on Dean’s TV, an unspoken arrangement Dean knows Cas values. He didn’t mean to but he overheard Cas tell Sam he’d fold the laundry in the morning because he had places to be. And that place was by Dean’s side. Dean blinks. In the recliner next to his, that is. Christ. Not like, next to him.
Cas pushed Dean against the concrete wall in the alley. The neon lights of the motel sign overhead, old and buzzing, flashed red. It was like a warning, a siren, a call for Dean to run away. Dean didn’t run. The passionate fire in Cas’s eyes fascinated Dean. He wanted to see if the flame would destroy him.
It was dangerous to let a powerful angel manhandle him like that. Cas could disintegrate him with a thought and a flare of holy light. Despite that, Dean was pliant, turned to putty, and let Cas do what he wanted. The danged excited Dean. It made him feel something. He hadn’t felt something like this since Hell.
Cas was yelling, shouting, his powerful booming voice echoing down the empty backstreet. The vibrations of it made Dean shiver, not unpleasantly, down to his core. Cas’s hands were hard and harsh on Dean’s shoulders. It could bruise him. It could mark him. Dean hoped it would. That way, he’d know Cas cared.
And Cas’s lips were close, so close. Dean stared at them, at how they moved, at how they were dry, and at how they would feel to touch.
Well, he was a dead man walking. Why shouldn’t he find out?
Cas cut off mid-sentence with a startled choking noise when Dean pressed their lips together. At first, Cas was hard and unyielding, but then Dean was shoved up against the wall by Cas’s big, strong body, and Cas was kissing him. Cas was kissing him with an open mouth and eager tongue which was quick to learn what Dean liked. Cas was still pissed, still seething, but he directed those feelings into dragging his teeth across Dean’s lower lip, into gripping Dean’s hips and holding him close, into keeping Dean in place with the force of his fury.
Dean grabbed the back of Cas’s neck and pulled him closer. It would burn them, would consume them both in a sea of red until nothing was left of them but blackened ash. Dean was ready.
A breeze cooled Dean, and he wasn’t in the alleyway anymore. He was standing in Bobby’s house, both his brother and surrogate father figure staring at their sudden arrivals with dropped jaws.