"Our timelines lead to the same place, the same end. That matters."

The space between he and Castiel is a lot wider than the mere physical distance between them. Castiel is of Lucifer's rebellious ilk, the kind of angels that yearn to be more than what they were made to be. Michael never did. He finds himself outside of his Father's favour by circumstance more than by choice. There's probably no resolving the differences between them.

There might, given enough time, be a way to move past them however. Adam had not exactly forgiven Michael for leading him into Hell, but they had coexisted well nonetheless.

The (mock?) cat in his hand is not the only thing in the room that is listless. Castiel is not the same angel who'd had the nerve to trick him into a pair of manacles. He can guess as to why—death has been going around, in the rest of Abraxas as it has been in Solvunn. It's been difficult for Michael to forget his own, and he has only the one that haunts him.

"You seem out of sorts. Let me guess: you remember your death? The final one."