Part of him believed that Dean was just humoring him, that he didn't really want to know. But then, he was friends with Castiel and angels were notorious about keeping stories from the Silver City a secret. Mortals didn't need to know things, didn't need to know how petty their supposed guardians were, how political they were. Duma loathed the politics. But that was a very long story and so he simply marveled at how Dean opened the soda can with raised eyebrows, smiling, "Human ingenuity. How clever you all are!" It would've been condescending from anyone else but Duma meant it.
He lifted the can to sip the liquid inside and was surprised by the bubbles, having to set the can down very quickly. A broad, lopsided grin formed even as he silently laughed and rubbed his nose. So fizzy. "I was blonde but I changed it. It isn't a vessel." He lifted the burger as Dean did and watched him intently to learn, nodding as he copied taking a bite. Hand food was strange. He would have to be careful of his fingers.
But the story. Duma moved his free hand over the phone and it began speaking, "Before the war, there was the Song - a record of all that was and all that will be. I was one of a number who were to keep watch over the Song and I saw the War, Lucifer's fall, the deaths of my brothers. I went to the Name to suggest warning the others but He wouldn't allow me. So there was war and death and pain..." Duma swallowed his bite and just stared at his food for moment, while the machine continued. "I refused to Sing after that - what we call guarding the Song. I would not speak again. The Name wanted to cast me out but my brothers spoke on my behalf, begged the Name to find another task for me. I did odd jobs, here and there, helped the dead find their place. Then Lucifer left Hell. Now I help maintain it."