au where the government incarcerate bucky in a high security secret facility and the avengers just conspire and break him out and when a government official comes to stark tower and is like ‘hey give barnes back’ tony is just like ‘he’s not here’ and the dude is all ‘he is sat right there’ and tony just goes ‘nah thats my cousin sergei’ and the government can’t do anything bc technically bucky barnes has been dead for 70 years and every year the facility gets a christmas card from the tower signed steve, tony, clint, natasha, bruce, thor and ‘cousin sergei’ and the card is just a picture of bucky with reindeer antlers on