From the introduction:
Welcome to a world based on the Harry Potter fanfic The Harem War by Radaslab. Here Harry has to deal not only with a manipulative Dumbledore, but also with becoming owner of several concubines (slaves), ruler of his own secret island country, and with his Death Eater enemies. But why keep things simple when you can complicate them? He also finds himself organizing the destruction of the concubine (slave) trade in the United Kingdom, which results in him and his friends becoming owners of several concubines each. Furthermore he is organizing a relocation of numerous refugees from the United Kingdom, including the families of rescued concubines and anybody that might be Death Eater targets like the muggle-borns and their families. Then some hippogriffs decide to seek asylum in his country Charenwell, followed by dragons and then by giants, while he starts organizing an army in order to eventually take the fight back to the Death Eaters.