One popular fanfiction concept could be Deku proving his worth without a quirk in the Bakudeku relationship. Maybe he uses his intelligence and strategic thinking to assist Bakugo in battles. For example, he could analyze opponents' weaknesses and come up with battle plans that Bakugo can execute. This would show that even without a quirk, Deku is an important part of their duo.
In some fanfictions, Deku's quirkless state might lead to a more complex emotional dynamic in the Bakudeku relationship. Bakugo could initially be overprotective, feeling guilty for his past treatment of Deku. Meanwhile, Deku might struggle with feeling like a burden, but then prove himself by showing extraordinary courage and determination in dangerous situations, which in turn deepens their bond.
A common theme is the underdog story. Deku, being quirkless, is the ultimate underdog. He has to fight against the odds and the prejudice of a world that values quirks highly. This makes for a very compelling story as he overcomes these obstacles, often with Bakugo by his side or as his motivation.
Perhaps Deku discovers a dark secret about the origin of quirks and decides that the world would be better off without them. So, he starts a villainous campaign to eradicate quirks. He could form an alliance with other outcasts who have been mistreated due to their lack of quirks or abnormal quirks.
In fanfiction, a quirkless Deku often has to rely more on his wits. Canon Deku got One For All, but in fanfic, he has to find other ways to be strong. For example, he might study different fighting styles more intensively.
His relationship with his mother would be extremely strained. She might be in denial about her son becoming a villain and try desperately to bring him back to the light. With his former friends like Bakugo, it would turn into a bitter rivalry. Bakugo, who used to bully him, now has to face a much more dangerous and calculating Deku.
One great quirkless Deku fanfiction is 'The Quirkless Hero'. In this story, Deku uses his intelligence and intense training to outwit villains. He forms an alliance with other underdog characters. It's really inspiring to see how he overcomes the odds without a quirk.
One great Izuku quirkless fanfiction is 'A Different Path'. It shows Izuku finding his own way to be a hero without a quirk through sheer determination and intelligence. He uses his knowledge of hero strategies and martial arts to hold his own against quirk - users.
One possible story could be Izuku proving himself in combat training without a quirk. He could use his intelligence and strategic thinking to outwit his classmates with quirks. For example, he might study their weaknesses in advance and set up elaborate traps during the training exercises.
You can find Bakudeku highly rated fanfiction on Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for Bakudeku ones and sort them by rating.
A 'bakudeku overstimulation fanfic' could be about exploring the boundaries of the relationship between Bakugo and Deku in a more extreme way. It might involve situations that are out of the ordinary for their typical interactions. For example, it could be set in a post - apocalyptic world where they have to rely on each other more than ever, and the constant danger and need for survival overstimulates their relationship. There could be non - stop action, with their powers being pushed to the max, and their emotions running wild as they face one life - threatening situation after another.
I'm not entirely sure specifically as there could be various interpretations. But generally, 'bakudeku' might refer to characters in a certain anime or manga universe, and a light novel based on them could be about their adventures, relationships, and growth in that fictional world.