Can't take off my mind this very specific flavor of sskk dynamics from a timeline that goes like: the doa arc never happened. Skip forward to bunch of years past the canon events, and you have sskk who can't really call each other enemies since it's now evident to everyone they enjoy seeing each other, but aren't friends either since they do very much still work for enemy organizations. And they just keep stumbling across each other on their respective missions from opposite fronts, trying to capture the same target for their own team, and they keep fighting and competing with each other in a way that is almost playful (but never going easy on each other because then where's the fun!), making them both almost look forward to meet and clash with the other on missions and to fight for the same target. And the mission accomplishment rate has now decreased to a 50% for both of them but neither of them can bring themselves to really care because for the first time they're having the carefree, mindless fun they never experienced in their lives and they have a person they enjoy to spend time with to the point they even got past denying it. And Atsushi telling Akutagawa “even if I let you go now, I'll still have to hunt you down” and Akutagwa replying “hunt me then” and theatrically disappearing out of a window or something leaving Atsushi laughing and just. them being together although nobody is going to say it out loud