The beginning of the end

MAJOR CHARACTER DEATH IS INVOLVED IN THIS ONESHOT, YOU HAVE BEEN WARNED! Oh would you look at that I'm back on Wattpad, hurray. POST ENDGAME AU WHERE EVERYONE IS ALIVE!
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Paranormal doppelgängers, illegal Stark tech stolen and other equipment used for some evil, a part of Natasha's past coming back to kill her; this must be the worst Christmas ever.