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Whenever Dean had nightmares Cas would just kind of sense that something wasn't right- and he'd appear, and he'd always put his hand over Dean's heart to calm him down, and it worked, every time.
For a long ass time, Dean woke up without that until one day, he wakes up from one of his nightmares- one where he'd died in some barn in a ridiculous, mundane way. And when he does, Cas is right there, his hand over Dean's heart, and his arms wrapped around him. Exactly how it's supposed to be.