Well, it could be about Naruto using some kind of special jutsu to reshape someone's rear end in a comical or perhaps even strategic way in the context of the fan - created story.
It could be Sasuke. Maybe as part of some strange training or prank, Naruto reshapes Sasuke's ass. It would be a really unexpected and funny scenario considering Sasuke's usually serious demeanor.
I have no idea who the author of this fanfic is. There are so many fanfic writers out there and without more information, it's impossible to determine.
I'm not sure specifically as I haven't read that particular fanfic. It could potentially be about a character named Harry who is involved in some sort of transformation or reshaping related to an ass, but that's just speculation without more context.
There's no way to know for sure who Harry is just from this title. He could be an original character created for the fanfic, or he could be a character borrowed from another work and being used in a new way within this fan - created story.
I'm not sure specifically as it's an odd title. It could potentially be about a character named Harry who is making changes or having an impact on a fan - created story related to something described as 'tight ass'. But without more context, it's really hard to say.
I have no idea if it's popular. There are so many fanfics out there, and just from this title alone, it's difficult to gauge its popularity. It might be a niche fanfic that only a small group of people who are really into the specific fandom or the unique concept it presents are interested in.
No. The official Naruto works are centered around ninja adventures, battles, and the growth of the characters. There's no way something as inappropriate as 'ass drinking' would be part of the official Naruto universe.
Elements like the exploration of the complex relationships between characters are important. This could be Naruto's relationship with Sasuke, his friends, or his mentors. Also, a vivid description of the ninja world, including its landscapes, villages, and hidden techniques. A well - thought - out antagonist or a series of antagonists that pose real challenges to the heroes can also enhance a Naruto fanfic.