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.
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.
Growth is also a major theme. Izuku's act of standing up is usually a sign of his growth, both as a person and as a hero - in - training. It shows that he's not going to be pushed around anymore and is ready to face challenges head - on, which is a big part of his journey in these fanfictions.
You can start by looking on Archive of Our Own (AO3). It has a vast collection of fanfiction, and you can easily search for 'izuku and fem bakugou' fanfiction there. The site also has tags and filters to help you narrow down your search based on what you're interested in, like specific genres or ratings.
One great 'izuku and fem bakugou fanfiction' is 'A New Bond'. In this story, they are forced to work together on a project at school. Fem Bakugou slowly starts to see Izuku in a new light as they overcome challenges together. It's a really sweet story that shows character growth for both of them.
One popular 'izuku stands up to bakugou fanfiction' is 'Green Sparks'. In this fic, Izuku finally has enough of Bakugou's bullying and stands up in a really powerful way during a training session. It shows Izuku's growth not just in power but also in self - confidence.
It's a really strange concept. In the original My Hero Academia story, Bakugou and Kirishima have a great friendship, and Izuku is also their friend. Cheating is a negative and unethical behavior, and it's hard to imagine these characters in such a situation. It might be an attempt by some fanfic authors to create drama, but it doesn't really fit the essence of the characters.
One possible reason could be that Izuku has grown up and wants to have a more formal relationship with Bakugou. As they progress in their hero training and development, Izuku might feel that the childhood nickname 'kacchan' no longer suits their new, more mature dynamic.