One reason could be jealousy. Maybe Tony has been spending more time with one of them, and the other feels left out and jealous. For example, if Tony has been helping Steve with some high - tech projects and Bucky feels ignored, it could lead to a fight. Another reason might be a misunderstanding. They could misinterpret Tony's actions towards each of them. Say, Tony gives Steve a special gift, and Bucky thinks it means something more than just friendship, leading to a fight.
In the fanfiction, it could be because of different ideologies. Steve has his own set of values and beliefs, and Bucky might have some different views. Tony, being a brilliant mind, could be seen as a way to support their respective ideas. Steve might think Tony's technology can be used for the greater good in a more traditional way, while Bucky might have a more radical view on how to utilize it. And they fight over who gets to have Tony on their side.
Well, it could simply be a matter of love. They both might have fallen in love with Tony. Steve, with his noble heart, and Bucky, with his complex and somewhat tortured soul, could both see Tony as the person they want to be with. And when love is involved, people can get pretty territorial and end up fighting over the person they desire.
The best chapter pointer here is Chapter 66, "This Sister Really Can Hustle!". It opens with I can't take it anymore, why did the young master even find a pair of... and closes on Unable to find a staff member to notify, and not wanting to waste time for....
A practical answer is Chapter 3, because it turns the idea into a concrete scene. The chapter opens with Qiao was still annoyed at the attitude of this unknown girl when she heard..., adds pressure through So without a second thought, she blurted out a fierce challenge, "Fine, if..., and ends on.
A practical answer is Chapter 31, because it turns the idea into a concrete scene. The chapter opens with Before Shen Lan had reached the backyard, she already heard the sounds of..., adds pressure through And judging from the photo, she was also a stunning natural beauty!, and ends on After.
Chapter 842, "Uncle Zhao?!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter gives readers a real answer by opening on But revealing is one thing, not making the old lady and the old man...
A practical answer is Chapter 14, because it turns the idea into a concrete scene. The chapter opens with Lin Manru had a rare good night's sleep., adds pressure through The young, vibrant life was buried amid the vast expanse of white, along..., and ends on But clearly, Lin Manru was unable to.
Chapter 41 is the strongest chapter-level answer because it starts from The live streaming room suddenly boiled over again. and follows through on In contrast, Wen Jiaojiao didn't have such awareness..
Chapter 65 is the strongest chapter-level answer because it starts from Several minutes later, the room remained silent. and follows through on What's the deal with these two?.
The best chapter pointer here is Chapter 1, "I'm Not Interested in Uncultured Men". It opens with Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or... and closes on Yet before she had the chance to teach her a lesson, the male lead arrived....
If you want the clearest chapter reference, go to Chapter 10. Early on, Qiao's shocked face struggle to recover, Lin Manru also tasted for the...; later, the chapter leans on Jiang Li nodded with a smile, seemingly approving of Lin Manru's words and....
If you want the clearest chapter reference, go to Chapter 51. Early on, Oh, okay." After uttering two syllables indifferently, Jiang Li bent down...; later, the chapter leans on By the time she reacted, Jiang Li had already disappeared at the end of....