When you really think about it, people aren’t exaggerating when they call Destiel the greatest love story ever told.
Cas is the one who gripped Dean tight and raised him from perdition…he reached into hell to save one person, and the moment Cas laid his hand on Dean, he was lost. An eternity of loyalty, forfeited for one man. Every angel in the garrison noticed Castiel’s change in behavior. Every single one tried to convince Cas that his loyalties lay with heaven, not with Dean, but Cas rebelled. He lost everything. He died for the Winchesters. He threw a molotov at his own brother, because it meant saving his boys. In Purgatory, he spent every night listening to Dean’s prayers, but he refused to answer them because he needed Dean to be safe. Every demon, monster, and angel knows the story. Castiel, once a loyal Angel of the Lord, abandoned everything he had ever known for Dean Winchester.
When Dean first returned from Hell, all of his scars were gone. Every mark on his body that told his life story had vanished, all except a handprint left by an angel. Dean, who never believed, not even after meeting a room full of Gods, starts praying because he needs his angel to hear him. Dean, who has spent his life avoiding feelings and “chick flick moments,” abandons all of that because he can see Cas is in pain, and he needs Cas to talk to him. When they went to rescue Samandriel, Cas told Dean how important it was to him that this one angel be saved, and even after Castiel collapsed, Dean kept fighting to get through the door and save Samandriel, because that was what Cas wanted more than anything else. Dean was willing to give his most prized possession (the Samulet) to Cas, because that’s how much he trusted him. He tampered with his own memories of Purgatory because he couldn’t bear to think that Cas left him on purpose. Even after being hunted in Purgatory, Dean refused to leave without the angel.
Four years of rebellion, betrayal, forgiveness, and nothing could tear them apart. Even after Dean found out Cas was working with Crowley, he still couldn’t let go. Even after Castiel realized he would have to give up his father, his family, and his heaven to stay with Dean, he still did it. Because that’s what their love is about. The kind of hope you can’t fake. The kind of unwavering trust and devotion that only comes once in an eternity. The greatest love story ever told.