No, it's not really acceptable. Abuse is a serious and often traumatic topic, and having it in fanfic can make many readers uncomfortable. It goes against the positive and creative spirit that the fanfic community generally aims for.
I'm not sure if it's popular. There are so many Naruto fanfics out there that it's hard to say which ones are popular without looking at fanfic rankings or community discussions.
I'm not sure if '300 sex fanfic' can be considered a common type. Fanfic can cover a vast range of themes and ideas. However, this specific description seems rather inappropriate and not likely to be mainstream. Most fanfic communities focus on more positive and creative aspects like exploring different character relationships, alternative storylines in a non - explicit way.
I'm not certain. It could be popular among a niche group of Naruto fans who are interested in seeing alternative takes on the character. But without more information on its viewership or the fanfic community's reception, it's hard to say for sure.
Good writing style is key to the best fanfic. This includes proper grammar, vivid descriptions, and a good flow. A fanfic that can make you feel like you're right there in the world it's creating, whether it's a medieval fantasy or a futuristic sci - fi setting, is more likely to be considered the best.
One idea could be a fanfic that explores the backstories of minor characters in RWBY more deeply. For example, you could focus on a character like Velvet and create a story about her training before coming to Beacon. Another could be a crossover within the RWBY universe itself, like a team-up between different schools' teams that we haven't seen much of in the official series.
No. It is not a common form. Most fanfic focuses on more positive, romantic, or adventure - based themes. This kind of 'prostate torture' related fanfic is very much on the extreme and inappropriate side, and is not something that is widely seen or accepted in the general fanfic community.
No. It doesn't seem like a common type of fanfic at all. Fanfics usually revolve around popular existing fictional universes like Star Wars or Harry Potter, and themes like this are not typically seen in mainstream fanfic writing.
I'm not sure if there are many fanfics with this exact concept. It could be a very unique and interesting take. Maybe in such a fanfic, Harry's wizarding world and Medusa's mythological realm collide in some unexpected ways due to their 'separated at birth' connection. It might explore how their different powers interact and how they come to terms with their strange relation.
No, it's not really mainstream. Most mainstream fanfic focuses on more common themes like romantic relationships, adventure, or expanding on the original storylines in a more typical way. Ageplay fanfic is a more niche concept that appeals to a specific subset of fans who are interested in exploring the idea of age - related role - playing within the context of their favorite fictional universes.