What if Cinos stayed in the TMNT 2012 Universe with Alopex, he can survive the Mutagen Bomb thank to his immunity and won't age as he remained the same in the Mutant Apocalypse. He meet Mira talk about things they totally lost in their past like family, love ones, etc but move on to their new future.

This is one of my first Cinos AU ideas which branch from the timeline which mean the Cinos Aftermath doesn't exist.