Duma exhaled heavily through his nose, shoulders dropping slightly. Even though Lucifer had betrayed them, technically speaking, Duma still considered Lucifer his brother and having some human talk about things he didn't understand... But anger was not something he could afford and he closed his eyes, clearing his thoughts for a moment. "No, I don't speak and have never broken that vow. Screaming does count. There's a story behind it." He had not touched the phone and yet it spoke for him anyway. Typing on it was mostly for show, to hide his true nature.
His smile was sweet like he found Dean charming that he wanted to watch over the archangel. Duma was not overly generous with the toppings since he simply wanted to try them. He nodded almost magnanimously at Dean's thanks. Once was satisfied with his burger, he went to sit back down at the table... But he wasn't sure how he was supposed to go about eating this thing. He still hadn't figured out how to open the soda even.