If Stelle dies in a fanfiction, it would have a huge impact on the overall narrative. Her character is quite important in Honkai Star Rail. For the other characters, it could lead to a lot of grief and changes in their relationships. For example, her friends like March 7th would be deeply affected. It could also potentially change the course of the story's main plot as Stelle often plays a key role in various events.
March 7th would be devastated. She and Stelle are close friends, and Stelle's death would leave a huge void in March 7th's life. Dan Heng might become more withdrawn as he was used to Stelle's presence. And for the other characters in the Astral Express crew, they would all experience a great sense of loss and sadness.
Well, it's hard to say for sure. The concept of 'porn-like' is quite subjective. Some might consider certain novels with excessive sexual descriptions as such, but it depends on individual perspectives and cultural standards.
In many places, 18+ porn comics are considered illegal. This is because they can have a negative impact on society and violate moral and legal standards.
The main distinction of porn with a story genre from regular porn is the presence of a coherent narrative. Regular porn often jumps straight to the sexual action, while the story genre tries to add some kind of story framework around it. But in the end, both are adult-oriented and feature explicit sexual content.