There are plenty of alternatives. You could write about their early days of courtship, focusing on the awkward yet sweet moments as they transition from friends to more than friends. Or perhaps write about how they contribute to the rebuilding of Hogwarts after the war. You can also create stories where they mentor young students together, highlighting their growth as individuals and as a couple.
In the Harry Potter fandom, writing such fanfiction is a controversial topic. While fanfiction allows for creative exploration, this particular theme might not be in line with the spirit of the original series which focused more on friendship, adventure, and the fight against evil. Many fans would find it disrespectful to the characters' established relationships in the books.
One alternative is fanfiction that delves into the post - Hogwarts lives of the characters in a more platonic way. This could include how they contribute to the wizarding community, or how they pass on their knowledge to the next generation. Also, there are fanfictions that expand on the magical creatures in the 'Harry Potter' universe, which can be really interesting.
There are numerous alternatives. For example, fanfictions that focus on the friendship between Harry and Draco. They could start off as rivals at Hogwarts but gradually come to understand and respect each other. Another option is fanfictions that explore the different houses' relationships, like how Gryffindors and Slytherins can work together against a common threat.
Some writers might create such fanfiction for the shock value. They want to break the established strong friendship in the original series to get readers' attention.
Adventure is also a big theme. They go on all sorts of adventures in the wizarding world, and fanfiction writers like to continue that. Maybe they go on a new quest to find a lost magical artifact or solve a mystery that was left unsolved in the original books. It gives the characters a chance to show their skills and grow even more.
It also shows the freedom and diversity in fanfiction. While it might not be in line with the original spirit, it allows for different creative ideas to be explored. However, it can cause some division within the fan community between those who support this new take and those who firmly oppose any deviation from the original relationships.
You could look for fanfictions that explore their friendship in the context of the wizarding war. Maybe they are strategizing against Voldemort or rescuing other characters. These types of fanfictions keep their relationship in line with the original concept and are much more interesting and appropriate.
You could also write about how they start a new magical business together. They could use their unique skills, Hermione's intelligence and Ron's practical knowledge, to create something amazing in the wizarding world. This would be a positive and appropriate way to write fanfic about them without involving inappropriate content.
Definitely not. The Harry Potter series is mainly aimed at a wide range of audiences including children and young adults. This kind of fanfiction violates the general moral and ethical norms within the fandom. The original relationship between Harry and Ron is based on brotherly love and friendship, and sexualizing it is a wrong direction.
Another alternative is fanfiction that explores the friendships between the female characters in the Harry Potter world. Stories about the bond between Hermione and Luna, or Ginny and her female friends at Hogwarts can be really interesting. They can show the power of female friendship in a magical setting.