The fanfic alters the perception of the characters in multiple ways. Steve's reputation as a trustworthy and noble character is at stake. His actions of 'cheating' are not in line with what fans usually expect from him. Tony, who already has a complex personality, now has another layer of being wronged added to his character. Bucky, who has his own set of issues in the official stories, is now part of this love triangle that further complicates his image. It shows how fanfics can reshape the understanding of beloved characters in unexpected ways.
I think this kind of fanfic can be quite controversial. In the Avengers universe, Steve and Tony have a complex relationship, and adding such a plot of 'cheating' with Bucky can change the whole dynamic. Some fans might like it for the drama it creates, but others might feel it goes against the original spirit of the characters' relationships.
One way could be through communication. Steve could come clean to Tony about his feelings for Bucky and apologize sincerely. Tony might be able to forgive Steve over time if he sees that Steve is truly remorseful.
Well, fanfics where the Avengers accept Tony can change the perception of his relationships. It can show that his often - prickly exterior doesn't mean he's not a valuable part of the team. In the fanfics, we might see more of his vulnerability, which can make readers/viewers see him as a more complex and relatable character. For instance, his struggle with his own self - worth and how the Avengers' acceptance helps him overcome that. It can also show his leadership skills in a new light, as the Avengers coming to accept him can be seen as them recognizing his leadership abilities even if he doesn't always act in the most conventional way.
One possible reaction could be Tony's heartbreak. He might feel betrayed and angry, leading to a rift in his relationship with Steve. He could also become distrustful of others in the future.
In the fanfiction, Steve leaving Tony for Bucky could also make Tony more guarded in future relationships. He might be less likely to trust people easily, especially those who were close to Steve. And Steve, on the other hand, might be focused on building his relationship with Bucky, leaving little room for any kind of reconciliation with Tony.
Well, it could severely strain their relationship. Tony might feel betrayed and hurt. He could start to question Steve's loyalty. Since Steve is ignoring him for Bucky, Tony might become resentful towards both Steve and Bucky. It could lead to a rift that's hard to mend in the story.
Tony might cut off his relationship with Steve completely. He's a proud man and wouldn't tolerate such betrayal easily.
In many fanfics, Tony's death shatters the Avengers. Pepper is left heartbroken and often has to find a new purpose in life. Captain America may feel guilty for not being able to protect him better. For Peter Parker, it's like losing a father figure. He might struggle with his identity as Spider - Man and question whether he can continue without Tony's guidance. The team as a whole may become more fragmented as they deal with the loss of their brilliant and resourceful member.
At first, it might be a bit rocky. Tony, being used to his own space, might feel smothered by Steve and Bucky's over - protectiveness. But as time goes on, he'll start to see their good intentions. Steve's moral compass will inspire Tony to be a better person, and Bucky's loyalty will make Tony feel secure. Eventually, they'll become like a real family, with Tony looking up to Steve as a father figure and seeing Bucky as a cool older brother.
One possible scenario in this fanfic could be that Bucky and Steve notice Tony is overworking. So they start by making sure he eats regularly. Steve might cook his old - fashioned but hearty meals, while Bucky keeps Tony company during meal times to make sure he actually eats. They also likely limit his access to the workshop for a while, to force him to rest. Maybe they set up a little relaxation area in Tony's living quarters with comfortable chairs and soft music.