The separation of the Hulk and Banner varies in Marvel comics. Sometimes, external forces or internal conflicts cause them to split, but it's not a consistent occurrence throughout all comics.
Yes, there are some hints of a special relationship between them. In the movies and comics, they share a unique bond. Hulk seems to have a certain level of protectiveness towards Black Widow, and she is one of the few who can somewhat reach out to the Hulk within Bruce Banner.
Definitely. There are fanfic communities that are family - friendly. In these, you might find stories about Hulk and Spider - Woman in alternate universes. Maybe in one story, they are part of a super - hero team and have to work together to overcome challenges. The possibilities are really endless when it comes to non - adult fanfics about these two characters.
I'm not sure who the absolute best is, but there are some well - known writers in the fanfiction community. Some writers who have a great understanding of both characters' personalities and powers tend to write really engaging stories. You can often find them by looking at the reviews and ratings on fanfiction websites.