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The first time it happens, Dean thinks that's it. He's dead. He's gonna have to kill himself, because he can't deal with the fallout. He didn't mean to, ok? It's just, sometimes his brain works on autopilot. Well, works. That's a big word. Because clearly it wasn't functioning when he... Might as well say it aloud. It's not going to disappear if he doesn't, no matter how hard he wishes. "Did I just kiss Cas?" When the angel was on his way out, too, as if – as if Dean's some sort of sitcom wife. Sure, it was more a peck than anything else, but still. Some things you do. Some things you don't, no matter how achingly bad you want to.
"Yeah," Sam confirms. Because of course Dean's brain fart had to happen in public. Or at least, in his brother's presence. No hiding it, no denying it. Of course, Sam just smiles at him, his politically correct college boy of a brother. Not a sneer, not a taunt, not even an overt tease. Behaving. Or, almost behaving. "Took you long enough."
"It's not – I'm not –" he stammers, automatically defensive.
"Seriously Dean, of all the people you could fool, you're trying this on me? As if I didn't know you're bi. It's my laptop you watch porn on, in case you've forgotten. Or that you've wanted Cas since forever, and it's very much reciprocated. I have eyes, and ears," Sam replies.
Dean kinda zones out after the first half-sentence, because even without meaning to, Sammy might have just saved his life. Fool. Sure, he can't fool his brother. They know each other too well. But maybe, he can fool Cas. One of the angel's most adorable traits is his cluelessness. For someone who's been alive for eons, there's an...innocence to Cas. And if Dean can pull the wool over his eyes, maybe he won't have to die out of sheer shame.
Dean's not into the plan because of the perks. Even if maybe he is. Obviously, the only way to make Cas think that this is nothing weird, not worth thinking twice about, is...to keep doing it. So what if he hasn't been kissing Cas right from the start. Friendships evolve. He's pretty sure. Ok, their friends tend to be dead before that can happen, but other people. Normal people, who have more than 2 friends alive at any given time, one of whom you're pining on. Their relationships don't stay the same for decades.
Knowing Sam isn't going to be against it helps, of course. It'd be a bit difficult to stick to the plan if he was hated for it. It'll be hard enough (pun intended) when he can count on his brother's support. If Sam tries to make him talk about it, though, he'll have to do something drastic.
He's got to keep it casual, if he's going to have any hope of success. More little pecks, to accompany "Hello," and "Bye."
He catches himself before he can confuse anime and real life, and pull the, "That's my country's habit," excuse. For one, he's not European. For another, Cas has seen enough of the States with them to know it's not how it works.
After watching one Doctor Who episode (Charlie's orders) he adds thank you kisses to his repertoire. He's not quite as passionate as Eleven, because if he did, he wouldn't be able to keep a rein on himself.
It should be awesome, right? And it is. Dean's not complaining about it – at all. He might have miscalculated, though. Oh, not the Cas angle. His angel takes it all in stride, as if that's normal, just like Dean had hoped. But Dean had lowkey counted on this quelling the burning inside him. He's getting something, after all. The most he ever has, in all these years. He should know how to content himself with what he can have.
Instead, every little kiss does nothing but making him hungrier. His lips keep tingling, and he has to bite them, because – he's not going to kiss Cas senseless. He's not. The angel might not have asked about this new development, but at least, Dean has some sort of vague rant he could use to shield himself. If he breaks...What is he supposed to say? And how is he expected to be able to cope, if Cas – reasonably, even – decides to retaliate by flying off and abandoning him, too? (He's still waiting for it. Good things don't happen – not to him; for sure, people don't stick around when they have any other choice).
An accident started this whole charade, and an accident ends it. Or at least that's the excuse he's going with. Even if part of him suspects he wasn't wrong back then, despite how weird it sounded. It's just – he's going for his now usual welcome peck, and at the same time Sam asks Cas if he's found any useful info about the latest weird creature they're after. Years and years, and they keep discovering more monsters than they'd ever imagined.
Cas turns a little, because it's polite to look the person you're talking to – just enough for Dean's lips to land right on his mouth. His open mouth (because Cas meant to speak, probably) and he really should know better than that. He should get away from him. Apologize. Instead...hey, he's going to swear to his last day that Cas's tongue invites his to play. Dean is only human, after all; his self-control has a limit.
Before he knows what he's doing, he's kissing Cas as deep and passionately as he's always dreamed. The angel tastes a bit like ozone, and...something. If Dean was a poet, he would write and write about this. But he's not an academic, he's a doer – and right now, a very very busy man.
By the time he's breathless (he resents being human, for all of one second) and forced to get away from him, Cas's lips are curled in a satisfied smile, and the ceiling light is very dead. (Sam's laptop better work, if they don't want to have to run.)
"I'm so glad you're okay with progressing our relationship," Cas says.
"Wait – we have ...?" Dean doesn't end that sentence, because the wounded look in Cas' eyes? It's simply unbearable.
"Forgive my brother, Cas, he can be dangerously dumb sometimes." Sam can't keep his mouth shut, naturally. But it's not like he's wrong, this time.
"I mean – sure! If you want, if you actually like.."
"We" Castiel says – Castiel, angel of the Lord, powerful and commanding – "need to talk," leading him towards... the table, yes, that's the table, not the bed.
"I'm gonna hit the library," Sam says, and Dean's quite sure he literally runs away.
Dean's never been much for talking, but – whatever his angel wants. Especially because he hopes he's going to be able to claim him as 'his angel' soon. No shamming.