Obadiah Stane, CEO of Stark Industries since Howard’s son died before Steve even woke up, isn’t happy that the Avengers haven’t caught the villain Iron Man yet. The mysterious man in the armor keeps destroying SI weapons, and even though they tried to arrest him, he always slips through the Avengers’ fingers. It doesn’t help that Steve enjoys their bantering a bit too much, and that he’s starting to think that Iron Man has a worthy cause.
In which officially Bucky and Iron Man are dating, unofficially Bucky knows Tony is Iron Man, officially no one else knows Tony is Iron Man, and unofficially Tony and Bucky are trolls.
Or, Steve and Natasha learn never to assume they know what's going on in Tony and Bucky's relationship.