I'm not sure if there is such a specific fanfic available. Fanfic topics can be quite diverse, but this one seems rather unethical in the context of the characters' relationships. You could try searching on major fanfic platforms like Archive of Our Own or FanFiction.net to see if it exists.
All Might would probably be one of the first to try to stop Bakugou. As Izuku's mentor and a symbol of justice in the story, he wouldn't tolerate such violence. Another could be their teacher, Aizawa. He's strict and protective of his students, so he'd surely step in.
Bakugou might be initially shocked. He's used to Izuku calling him 'kacchan' for so long that it's become a normal part of their relationship. So, when Izuku stops, it could throw him off balance.
In this kind of fanfiction, it usually shows a build - up of tension between Bakugou and Izuku. Bakugou might have been constantly pushing Izuku's buttons with his aggressive behavior and taunting. This could lead to Izuku finally reaching his breaking point. For example, Bakugou's over - the - top insults about Izuku's abilities or his dreams might be too much for Izuku to bear. And when Izuku snaps, it could lead to a big confrontation between them, which can be a very dramatic and interesting plot point in the fanfiction.
A great way to develop their relationship is through shared traumas. Maybe they both had a difficult experience during a villain attack. They could open up to each other about their fears and insecurities during that time. This vulnerability would bring them closer together. Additionally, they could participate in a hero competition together. As they face tough opponents, they encourage each other and celebrate their victories, which deepens their bond.
There's a fanfic titled 'Bakugou's Hidden Care'. Here, the story is set during their training days. Bakugou notices Izuku struggling more than usual. He doesn't show it in the typical way, but he starts to subtly protect Izuku from overexerting himself and getting injured. It's a great exploration of their complex relationship.
One possible reason could be that Izuku realizes Bakugou's unchanging and hostile attitude. Despite his efforts to be friends or get along, if Bakugou continuously rejects him or is overly aggressive, Izuku might feel it's a lost cause.
In this kind of fanfiction, a likely consequence is that it changes the whole dynamic of the story. Their classmates might take sides. Some might side with Izuku out of sympathy, while others might try to understand Bakugou's actions. It could also lead to changes in the school's view on Bakugou, perhaps implementing stricter rules or counseling to prevent such incidents in the future.
The main characters are obviously Bakugou and Izuku. Bakugou is often portrayed as the instigator, with his brash and sometimes cruel behavior. Izuku, on the other hand, is the one who endures Bakugou's actions until he finally snaps.