Castiel & Zatanna Zatara
He grinned at the mention of the Winchesters. "Yes, they are like brothers to me," he said, after a moment. "You know... knew... Sammy, right?" It was weird, asking it that way, but he wasn't exactly sure how else to phrase it.
He nodded a bit at her question, "I am, so far. I hadn't planned to come, but Balthazar decided I needed to be here. So here I am." He shrugged at this. He found that he couldn't tell Balthazar no, especially after what had happened in their world.