Maybe because it creates an interesting dynamic. Tony and Bucky have had their differences in the original story, so having Bucky take Tony's side is a fresh take on their relationship. It allows for new storylines and character development.
One reason could be to explore themes of forgiveness and redemption. Bucky has a complex past, and by taking Tony's side, it can show his growth and willingness to make amends. Also, it can add a new layer to the overall narrative of the fandom, making the story more engaging and full of possibilities. It gives a chance to see how these two characters, who were once at odds, can work together towards a common goal, which is really exciting for fans to read about.
In some fanfictions, having Bucky take Tony's side might be a way to explore different power dynamics. Tony is often seen as a powerful and intelligent character, and Bucky has his own set of skills. When Bucky takes Tony's side, it can lead to interesting scenarios where they combine their strengths. Additionally, it could be a way to explore different interpretations of their personalities. Some fans might see Bucky as having a more empathetic side that would lead him to side with Tony in certain situations, and fanfictions are a great way to explore these ideas in depth.
A practical answer is Chapter 8, because it turns the idea into a concrete scene. The chapter opens with The resentment that had barely calmed among the crowd surged back two..., adds pressure through Why keep harping on the fact that he wasn't a decent man?, and ends on Other people with a.
Chapter 808, "Dare to Spank Him?!", is the clearest early answer because it turns Teacher Wu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with I don't listen, I don't listen," Jiang Bufan once again started his...
Chapter 760, "Daoist, I've Long Heard of Your Great Reputation", is the clearest early answer because it turns Lin Man Ru's situation into a concrete plot event. It opens with In the winter, everyone sat in the courtyard, enjoying the cold...
Chapter 628, "It's Time for Them to Show Themselves!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. It opens with What are you fantasizing about?" Bai Lu looked at him incredulously,...
The best chapter pointer here is Chapter 14, "She Looks So Cool Dancing with a Gun". It opens with Lin Manru had a rare good night's sleep. and closes on But clearly, Lin Manru was unable to accept that her delicate daughter had....
Look to Chapter 13 for the clearest answer. It begins with Sensing that something was off with Jiang Yan, Jiang Yan dismissed the..., keeps building through What on earth do you mean?" Ignoring him once again, Jiang Li shifted her..., and lands on How could this happen..." Lin Manru didn't want to.
Chapter 827, "Mystical Event Investigation Bureau", is the clearest early answer because it turns Yu's situation into a concrete plot event. It opens with Jiang Li's words indeed make sense. and closes on Besides, their original intention to construct the Seven Star Feng....
Chapter 614, "Storm Crisis", is the clearest early answer because it turns Feng Shui's situation into a concrete plot event.
The best chapter pointer here is Chapter 4, "She Can Actually Tell Fortunes?!". It opens with Qiao regretted her words as soon as they left her mouth. and closes on A little girl acting mysterious, learning fortune-telling, what is this....