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.
Perhaps in this fanfiction, there is a misunderstanding. Bakugou might be framed for something really bad, and Deku, believing the false evidence, takes it upon himself to be the 'avenger' and kills Bakugou in a fit of rage. Or it could be related to a power struggle where Deku feels Bakugou is becoming too powerful and dangerous.
It could also be that in the fanfiction's storyline, there is a prophecy or a dark force that compels Deku to kill Bakugou. For example, if it was prophesied that Bakugou would bring great destruction in the future and Deku believes he can prevent it by killing him. Also, if there is some sort of competition for a very important goal, and Bakugou stands in Deku's way, that could lead to such a tragic event.
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.
At first, it could be extremely strained. Deku might be terrified of Bakugou and avoid him at all costs. But as the story progresses, if Bakugou realizes his mistake, he could start trying to make it up to Deku. Deku, on the other hand, might be hesitant to accept Bakugou's apologies at first, but over time, they could start to rebuild a more positive relationship based on mutual respect.
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.
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.
One possible theme could be bullying and its extreme consequences. Bakugou's statement is an extreme form of bullying, and the fanfic might explore how such words can deeply affect Deku's mental state. Another theme could be redemption. Maybe the story will show Bakugou realizing the gravity of his words and trying to make amends. It could also touch on the theme of friendship, as Deku might have to decide whether to forgive Bakugou and rebuild their relationship.
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.
No, they don't. Their relationship in the manga is more focused on rivalry and growth as heroes rather than romantic gestures like kissing.
It depends on the specific context and storyline. Sometimes Bakugou shows great strength, but Deku often surprises with his determination and growth.
Deku might be initially shocked. He's used to Bakugou's aggression, but an actual injury is different. He could be in pain and disbelief at first. Then, he might try to downplay it, especially if he doesn't want to cause trouble for Bakugou, because Deku is generally a very forgiving character.