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When Dean Winchester is sent five years into the future by Zachariah, he learns not only of the apocalyptic consequences of saying no to Michael, but also of what passions the end of the world inspires in humanity. His future self and Castiel both have heartfelt conversations with him, and he gradually realizes that his feelings towards the Castiel from his own time might not be as platonic as he thought.
Alternatively, Future Castiel observes Dean from the past as he struggles to take in the horrors of the future, and tries to relate him to the future Dean Winchester he knows. The two men are one and the same, separated only by five years, but that might just be enough to turn them into different people entirely.