It's not appropriate. Fanfiction should respect the essence of the original story. The 'Harry Potter' series is about magic, friendship, and the fight against evil. Adding sexual content, especially in the form of fanfics, distorts the intended meaning and can be offensive to many fans of the series.
No. Fanfics with sexual content are not appropriate reading materials, especially when it involves underage characters as in the case of Harry Potter series. Such content goes against the family - friendly nature of the original work and can also be considered unethical.
Definitely not. 'Harry and Cho' are characters from the 'Harry Potter' universe which is mainly targeted at a young audience. Fanfics with sexual content not only violate the spirit of the original story but also may have a negative impact on those who read it, including promoting inappropriate ideas and behavior.