In the Cage, we came to an agreement. We only had each other.
After the time they both spent in the Cage, Michael and Adam came to an agreement, sharing control of their vessel. Michael even allows Adam to take control so he can enjoy pizza with a burger and fries, despite knowing that they don't need to eat, because Adam hasn't eaten anything in a decade and misses the taste of food. Michael decides to continue using Adam as a vessel, needing a guide to catch up on how much the world changed over the past decade. Adam also acts as Michael's conscience, trying to persuade him to listen to Sam, Dean, and Castiel when they are talking about the threat God presents to the world, despite not forgiving them for leaving him in the cage.
- Did anyone stop to think that part of the reason Michael refused to go along with Dean and Castiel to Purgatory was because of Adam? by deans-haunted-baby (December 2019); archive link