The legality of erotic fanfic stories is a complex issue. In some cases, if they are clearly transformative and not directly competing with the original work, and as long as they don't violate any obscenity laws, they might be considered legal. However, if they use copyrighted characters in a way that the copyright holder deems inappropriate or if they cross the line into pornographic territory according to local laws, they can be illegal.
The legality of erotic fanfic stories varies. If the story is a non - commercial, transformative work that respects the basic rights of the original creators and adheres to local laws regarding sexual content, it may be legal. However, many factors come into play. If it causes harm to the reputation of the original work or if it is distributed in a way that violates the terms of use of the original franchise, it may be considered illegal. Also, different countries have different laws regarding sexual content in literature, which further complicates the matter.
It depends. Erotic fanfic stories can be legal in certain situations. For example, if they fall under the fair use doctrine, which allows for some creative use of copyrighted material for purposes like commentary or parody. But if they are simply using the popularity of existing characters to create sexually explicit content without any real transformative value, they could potentially be in violation of copyright law or obscenity laws in some areas.