It could be about a fan - created story in the My Hero Academia (MHA) universe where Bakudeku (presumably a relationship or dynamic between Bakugo and Deku) are involved with a secretary agency. Maybe they work there, or the agency has something to do with their hero activities.
In some fanfictions, new original characters are introduced. These new characters are designed to be a potential threat to Uraraka's relationship with Deku. They might be transfer students with amazing quirks who immediately take an interest in Deku. Uraraka then sees this new character getting close to Deku and becomes jealous, leading to various conflicts and emotional drama in the fanfiction.
You can try looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. They have a large collection of My Hero Academia fanfics, and you might be able to find the 'bakudeku secretary agency mha fanfic' there.
A popular plotline is when there's a new girl who has a power that complements Deku's really well. Uraraka sees them interact and gets jealous. She may start to doubt her own worth and place in Deku's life. In response, she could either become withdrawn or go on a journey of self - improvement to be more confident and show Deku that she's the one for him.
Uraraka might be jealous of someone who has a more powerful quirk than her and is getting more attention from Deku. So she decides to train secretly to improve her quirk. After some time, she shows off her new skills and gains Deku's admiration again.
She might be initially scared but quickly regain her composure. Uraraka is a brave character. She would likely start looking for ways to escape, using her zero - gravity quirk to her advantage, like floating up to vents or disabling the villains' weapons if she can.
Midoriya's family would be ecstatic. His mother would be busy helping with the wedding preparations, giving advice on everything from the dress to the food. Uraraka's family would be equally happy. They would see Midoriya as a kind - hearted and strong young man. Her mother would likely bond with Midoriya's mother over the wedding plans, and the two families would come together to celebrate the union of the two young heroes.
A villain like Shigaraki would likely be interested in the power levels in the MCU fanfiction. He's always looking for ways to increase his own power, and seeing the various powerful artifacts and abilities in the MCU might give him some ideas. He could think about how he could use similar things in his own plans to take over the MHA world.
Some MHA characters might be flattered. For example, Midoriya would probably be really excited and take it as a sign of how much he's inspired people. He might even look for positive lessons in the fanfiction to improve himself.
If the MHA characters were to react to a Mastermind fanfiction, some would be more accepting than others. Characters like Ochaco might find it really exciting. She's a fan of the heroes herself, so seeing different takes in fanfiction would be like getting a new perspective on the MHA world. However, characters like Shoto, who are more reserved, might be a bit hesitant. He might need some time to process what he's reading. But overall, it would be a very interesting scenario as it would show how the characters view different interpretations of their world.