Okay it's like yes they are head over heels in love with each other, but they are also best friends. They went from eye fucking each other for extended periods of time in complete silence, to bickering like an old married couple. A 300 million year old warrior of God who's never experienced emotion or had an relationship with another being and a man who's never had a relationship with another person outside of his family, let alone an actual friend in his life, became best fucking friends. And they are each other's first best friend. Like they are family, Cas lives in their house, they have shared jokes and memories, they do dumb shit together, they watch movies together, they just hang out and do nothing sometimes, they know each other better than anyone, and they trust each other and they fucking love each other so fiercely. And it's like yes, Cas is the only thing in the universe that defied Chuck's narrative, because he loves Dean, but it's more than that, because like that's his fucking person. Dean is the person who understands Cas the most when nobody else does, the person he trusts, the person he talks to, the person he tells things he's never told another soul, and it's established that Cas is also that person for Dean.
They are each other's people. And they were both content to just stay best friends forever and never mention how they truly felt thinking their feelings were unrequited, because that's how important they are to each other.
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