No. Most mainstream platforms do not support or allow fanfiction that involves inappropriate or non - canon concepts like 'inheriting concubines' which goes against the original spirit of the Harry Potter series.
In traditional Harry Potter fanfiction, the concept of concubines is not a common or canonical element. The wizarding world in Harry Potter mainly focuses on magic, friendships, and battles against dark forces. However, in some very non - traditional or AU (alternate universe) fanfictions, an author might introduce some strange or unique concepts like this, but it's far from the norm.
The 'Harry Potter' series is mainly aimed at a young audience and the concept of 'concubines' goes against the values of the original work. While in the world of fanfiction, all kinds of strange ideas might exist, but this is not in line with the general spirit of the 'Harry Potter' world. So, it's not a common or acceptable theme in the mainstream 'Harry Potter' fanfiction community.
No. Slavery is an abhorrent concept that goes against the values of equality and freedom promoted in the original Harry Potter series. Harry Potter is about fighting against oppression, not inheriting slaves.
The pure - blood supremacists could be antagonists. They might not like the idea of Harry, a half - blood, inheriting Hogwarts and try to undermine his authority.
One possible plot could be that Harry Potter, as the new owner of Hogwarts, decides to reform the school's curriculum. He might introduce new magic subjects that were previously overlooked, like ancient rune magic for practical applications.
Perhaps in this fanfiction, Harry inherits Azkaban due to some dark family secret. He then has to deal with the dark forces that have been lurking within the prison walls for centuries. He might find a way to use the prison's own dark magic against Voldemort's remaining followers who are hiding in the shadows.
Well, he might use his magic to improve the city. For example, he could make the buildings more magical, like adding self - cleaning spells to the streets. He might also establish a magical school in the city for young witches and wizards who couldn't go to Hogwarts.
Some pure - blood supremacist wizards might oppose Harry. They may not like the idea of a half - blood like Harry having so much control over a city and could try to create unrest. Also, there could be some non - magical criminals who target the city because of its new magical elements under Harry's leadership.