One idea could be that Bakugou wakes up with a strange quirk malfunction that makes him overly nice. He starts complimenting his classmates, which leaves everyone in shock. For example, he tells Deku that his analysis skills are actually really impressive. This throws the whole class dynamic off, but in a really interesting way.
Well, Bakugou might start by saying 'good morning' to everyone in a really friendly tone, which would shock his classmates. He could then offer to help in the kitchen during lunch prep, which is something he would never do normally. This would lead to some really interesting conversations with the other characters as they try to figure out what's going on with him.
There's this fanfic called 'When Bakugou Falls'. It's about Bakugou getting injured during a training accident. What makes it interesting is how his classmates react. Some are overly worried, some try to act tough but are secretly concerned. And Bakugou's own pride gets in the way of his recovery at first.
One benefit is that it makes the animals happy. Happy animals are more likely to be friendly towards us. For example, a well - treated dog will wag its tail and be excited to see you.
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 great fanfic could be 'Bakugou's Little Protectors'. In this fic, Bakugou stumbles upon a group of lost kids during a villain attack. He quickly takes charge, using his tough exterior to keep the kids calm. His explosions, which are usually seen as aggressive, are now used to create a sense of safety as he scares off any approaching threats. The story beautifully shows how his rough personality can be a source of comfort for the children.
Being nice to friends can lead to more enjoyable social experiences. If you are kind and positive in your interactions, your time together will be more fun. Also, it can expand your social circle. When your friends see how nice you are, they are more likely to introduce you to their other friends. Moreover, being nice to friends helps in reducing stress. A harmonious friendship where everyone is nice to each other is a source of comfort and relaxation, rather than a source of worry or conflict.
One good Bakugou overworked fanfiction is 'Bakugou's Burden'. It delves into how his intense training and hero work start to take a toll on him both physically and mentally. The author does a great job of showing his struggle to keep up his tough - guy facade while secretly being exhausted.
I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide range of themes, but this one seems rather unorthodox in the context of the original My Hero Academia story. It might exist in some corners of the fanfiction community, but it's not a common or widely - known concept within the mainstream fan base.