I find sastiel interesting as a concept but Dean and Cas are so crazy about each other, it’s become hard for me to see them with anyone else

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I find sastiel interesting as a concept but Dean and Cas are so crazy about each other, it’s become hard for me to see them with anyone else
(soulmate au)
Dean doesn’t dream often, but when he does, he dreams of messy hair and a wrinkled ill-fitting trench coat. The dream’s recurring, and each time, the face gets clearer. High cheekbones, strong jawline. A pair of sad, blue eyes.
His favorite dreams are when they guy laughs, all teeth and gums, with crinkles by his eyes. Dean wakes with a mirroring smile on his own lips - until he reaches into the space beside him and finds it empty.
Dean doesn’t totally understand why he keeps dreaming of the same guy, and he’s too afraid to do much research about it, afraid that learning too much might make the dreams stop.
One day, he has too much to drink and asks Sam, “What does it mean when someone has the same dream all the time?”
Sam’s in college, he should know stuff. But he shrugs as he says, “Maybe your brain’s trying to resolve some problem.”
Dean knows that’s not right. He can’t explain why. Just a feeling in his gut. “It’s not a problem, though, it’s a person.”
“A person?” Sam asks. When Dean nods, he watches Dean close as he says, “Someone you know?”
“No.”
Sam frowns in that worried-Sam way. Dean sighs, knowing now he shouldn’t have brought this up.
“Maybe you’re lonely,” Sam says, and after that, though they already schedule a dinner weekly together, Sam starts inviting Dean over three or four times a week.
It’s nice.
It doesn’t stop the dreams.
Thinking about how at the end of s5, after Lucifer beat the shit outta Dean and is about to kill him, Dean’s all bloody unable to fight back and he’s so vulnerable and wants his brother back and implores for him to still be there and that’s what helps Sam come back to himself.
And how in s8, after brainwashed Castiel beats the fuck out of Dean is about to kill him and Dean’s on his knees and begging for his friend to be there, and how the bloody vulnerability is what snaps Cas back to himself.
And how in s10, after Dean beats the holiness out of Cas, and he’s sprawled on the floor, at Dean’s—who’s affected by the bloodthirsty curse—mercy and still calls out to him and it lets Dean assuage the mark.
Just thinking about it.