In some fanfictions, Bakugo can become more empathetic. For example, if he experiences a situation where he realizes the pain he's caused Deku over the years. His aggressive nature might soften as he starts to understand Deku better. Deku, on the other hand, could become more assertive. Instead of always being the timid one, he might stand up to Bakugo more firmly in fanfiction scenarios.
No way. The manga portrays their connection through mutual respect and competition in their journey to become great heroes. A kiss is not part of that narrative at all.
You can find 'bakugo and deku fanfiction' on websites like Archive of Our Own (AO3). It has a large collection of fanfictions related to various fandoms, including this one. Fanfiction.net is also a good place. There are many users who contribute their works about Bakugo and Deku there.
I think it's a toss-up. Deku has potential and is constantly evolving, but Naruto's strength and strategic thinking give him an edge. It could come down to the specific circumstances of the fight.