HIMYM AU: Barney finds out that Robin works for S.H.I.E.L.D as Agent Hill (Part 1)
They’re mixing two different universes together and yet it still makes waaay more sense than the finale.
….you know what, it really does.
HIMYM finale headcanon accepted. And then they pretend to get divorced and Robin/Maria distances herself from her friends and a couple years later someone captures footage of Maria Hill during a big superhero battle and she has to come clean to everybody and THEY ALL RESUME BEING FRIENDS AND NONE OF THE REST OF THE FINALE HAPPENS and also, later, the group accidentally meets the Avengers, and Barney spends the entire time convinced Tony is hitting on Robin (which Tony plays into to screw with him) and Lily, Tracy and Natasha disappear somewhere to bond and Steve is both charmed and weirded out by Marshall and Ted is left to try and socialize with Clint, who just sits there quietly letting Ted dig himself a deeper and deeper hole as his questions and overtures get more and more awkward.
And Robin/Maria is all, “I KNEW THIS WOULD HAPPEN. I KNEW IT. KNOCK THAT OFF RIGHT NOW. YES, YOU.”
So Tony lets Barney off the hook and Barney immediately starts awkwardly fanboying all over him, and Clint lets Ted off the hook and cracks up and Ted is all “wait what you have a facial expression?!"
And Robin/Maria goes to find Natasha and drink until the whole thing is over. Never again. This is never happening ever again. (It happens again.)