It’s been nothing but hell since they met. Fire, apocalypse, civil war, leviathan, Purgatory, tablets, the fall, all of it hell on earth. That’s what the world remembers, but not them. They remember the thousands of moments when they didn’t bleed, cry or run from eachother. They remember the moments when everything made sense only because they were finally together.
Sam looks fondly to when they first found the bunker, the home he never had. Castiel never forgets the first time Dean took his hand when he reached him for a second time in hell. He let the blade fall into Lucifer’s cage, lost along with its power over his heart, letting Cas fill it with light once more.
Dean, however, hold a different memory close to his heart. It’s a collage of moments between him and his favorite people. The first time Cas shared his doubts and showed Dean they were more alike than anyone else could have ever thought. The look on Sam’s face when he made it back from Purgatory. The first time Cas made him laugh outside the “den of inequity”, the moment he thinks he started falling. Watching Sam meet the mother he couldn’t remember, even if she was a ghost. The first dinner they had as a family when Cas raised him a second time. The first without the end of everything hanging over their heads.
No else remembers these things. But then again, no else needs to.