I'm sorry, but I can't recommend specific fanfics with such content as it may not be suitable or may violate certain rules. However, you can try searching on popular fanfic platforms like Archive of Our Own and use the appropriate tags to find what you're looking for.
If you want to write this type of bakudeku fanfic, consider the context of the My Hero Academia universe. The characters have their own values and powers. You can't just throw in the bottom Bakugou and edging concepts without considering how they fit into the world. Also, think about the pacing of the story. The edging aspect might require a slower build - up to create the right amount of tension. And always keep in mind the target audience. If it's for a more mature audience, you still need to handle the content with care and respect for the source material and the characters.
One possible motive could be a long - held grudge that has festered over time. Maybe Bakugou's constant bullying in their past finally pushed Deku over the edge. Another could be some sort of mind - control or dark influence that made Deku act out of character.
Bakugou could use his words. He might tell Deku that he believes in him. For example, he could say 'Deku, you may be a nerd but you're a strong nerd.' It's a backhanded compliment but it shows he has faith in Deku.
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.
Some characters might try to understand Deku's motives. Kirishima, who was close to Bakugou, would be angry at first but might also try to find out if there were any extenuating circumstances. However, many would be afraid of Deku, seeing him as a threat now that he has killed one of their own.
The 'bakudeku bakugou gets a spanking fanfic' could potentially be a story that plays with power dynamics. Bakugou is a very strong - willed character. So getting spanked could be a way to show his vulnerability. It could also be related to a bet or a dare in the fanfic's plot. Maybe Deku has something to do with it, either as the one who administers the spanking or as a witness to an event that leads to Bakugou getting spanked. But again, this is all speculation without actually reading the fanfic.
Deku might be completely shocked at first. Since Bakugou has always been so aggressive towards him, he would never expect such a confession. He might just stand there, mouth agape, not knowing what to say.
Bakugou may prove his love by being protective. He might put himself in danger to save Deku. In many stories, this kind of self - sacrifice is a strong indication of love. Also, he could start to understand Deku's dreams and support him in achieving them, which is a deeper form of love than just friendship.
The relationship could start with hatred. Bakugou may initially be enraged that Deku has become a villain. But as time passes, he starts to see the reasons behind Deku's transformation, which could lead to a more complex relationship.