Definitely not. Such content objectifies the characters and goes against the spirit of fanfiction. Fanfiction should be about building on the existing story, exploring different plotlines that are in line with the general tone of the original work. Sexual fanfic of this nature not only disrespects the source material but also can lead to a lot of controversy and a bad reputation for the fan community as a whole.
No, writing fanfic that involves sexual content about fictional characters is inappropriate and unethical. It violates the privacy and respect that should be given to the characters, whether they are from a book, movie, or other media. Additionally, it may also be against the terms of use of the platforms where such content might be shared.
It's not appropriate at all. Fanfic is supposed to be a creative way to explore characters in a non - offensive and family - friendly way. When it involves sexual content, it can make many people uncomfortable, especially those who are fans of the characters for other reasons like their storylines or personalities. Also, it can have a negative impact on the overall fan community.