Bella might go into a deep depression. She was so in love with Edward, and his death could shatter her world. She could become withdrawn and isolate herself from her friends and family.
Edward would likely be in a state of panic. He loves Bella deeply, so he'd probably do everything in his power to save her. He might search for a cure or a way to reverse whatever is causing her to die.
Edward would be completely devastated. He would likely go into a blind rage and seek out whoever was responsible for Bella's death. His love for her was so intense that he would stop at nothing to avenge her.
There are other fans who are interested in exploring different storylines. They see it as a creative way to expand the Twilight universe. They might enjoy seeing how the characters would react in such a difficult situation, even if it's not in line with the original story.
She might be devastated. Bella was deeply in love with Edward, so his leaving would be a huge blow. She could cry for days and feel like her world has ended.
Edward might be extremely protective. He already has a strong urge to keep Bella safe, but with the added connection to the Joker, he'd be on high alert. He might be worried about the Joker's influence on Bella and try to keep her away from that part of her life.
Edward might be a bit disappointed as he values responsibility. But he would also offer to help immediately because he cares about Bella. He might say something like 'Let me take care of this, Bella. You don't need to worry.'
It's very unlikely that 'bella pussy is fist twilight fanfic' is a popular one. Popular Twilight fanfics often have titles that are related to the main characters' relationships, like Bella and Edward's love story, or some exciting plot twists within the Twilight world. This title is so unusual and hard to understand that it probably doesn't gain much popularity. Plus, if it contains some really unclear or unappealing language as it seems from the title, it would further reduce its chances of being popular.
Definitely not. The Twilight books are aimed at a wide audience, including younger readers. Fanfics that use such inappropriate descriptions are not in the spirit of the original series. It's better to explore fanfics that respect the characters and the story's essence without using such vulgar concepts.
Yes, there are some out there. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for 'Twilight Bella is a werecat' and you'll likely find a variety of stories with different takes on the concept.