Michael and Lucifer circled each other on the chosen field, each consumed by their own thoughts.
Michael looked at his little brother. Sure, he had tons of little brothers, but Lucifer was the first. It had just been the two of them for a long time. He had watched over him and raised him. Their father had had a lot of other things to do after all. It just wasn't right to kill your little brother. Part of him was glad that Dean had said no to him. Otherwise, this would be a double tragedy.
Lucifer looked at his big brother. He used to idolize him. He couldn't believe that it had come to this. Way back when, before he had "disobeyed" he would never have believed that they would have to kill each other. He had followed Michael around like a puppy. Puppies hadn't existed yet, but when he heard that expression much later, he realized how much it had described him. He wished Dean had said yes. If he was going to have to kill his big brother, he wanted Sam to have to kill his, too.