Perhaps a theme of social hierarchy. The existence of a slave harem implies a certain kind of social structure. The main character is at the top of this structure, and the story could explore how this affects the characters within the harem and those outside of it. Another theme could be moral ambiguity. The main character's actions of creating a slave harem are clearly morally questionable, and the novel could delve into how he deals with this moral gray area.
One possible theme could be self - discovery. The main character, who has made this slave harem, might start to question his own values and beliefs as he interacts more with the characters in the harem. Also, a theme of cultural differences could be there. If the harem consists of characters from different backgrounds, their different cultures could play a role in the story.
One possible theme could be the exploration of the boundaries between the living and the dead. It might also touch on themes of loneliness, as perhaps the human character is so alone that they seek connection even with a non - corporeal being. Another could be the idea of the unknown and the fear that comes with it, as having a sexual encounter with a ghost is definitely an unknown and potentially terrifying experience.
If we assume it's not a purely pornographic work but has some literary merit, it could explore themes like chance and fate, similar to how the lottery concept often represents. Maybe it uses the idea of the lottery to set up unexpected encounters or changes in the characters' lives that are intertwined with the erotic elements.
Well, ignoring the inappropriate 'lemon' aspect, in dragon harem fanfics, cultural clashes can be a common theme. If the dragon harem consists of characters from different races or cultures, there will be clashes and also reconciliations. Also, self - discovery is often a theme. Each member of the harem may go through a journey of self - discovery as they interact with the dragon and other harem members. For example, a human in the harem might discover new magical abilities or a new understanding of their place in the world.
It could potentially explore themes of despair, isolation, and the search for meaning in life. These are often associated with the idea of suicide.
It could potentially have a theme of redemption. Nico might be atoning for past mistakes through this experience. Or it could be about learning boundaries, both for Nico and for the person administering the spanking. The story could show how these boundaries are set, crossed, and then re - established in the context of the fictional situation.
It could potentially explore themes of betrayal and its consequences not just on the relationship but also on the characters' self - esteem and their place in the fictional society. Maybe it also delves into themes of forgiveness or the lack thereof.
One possible theme could be the exploration of self - discovery. As they get closer in this way, they might learn more about themselves. Another theme could be the breaking of social or cultural barriers within their fictional world.
Well, often there can be a theme of adaptation. Naruto has to adapt to the new world of Pokemon and the presence of Pokegirls in a harem situation. There may also be a theme of protection. Naruto might feel the need to protect the Pokegirls, and in turn, they might also protect him. Additionally, the concept of growth is common. Characters grow not only in their relationships but also in their understanding of the two different universes they are part of.
One common theme is power dynamics. In a slave harem setup, the main character often has some form of power or ability that attracts the other characters. For example, in 'The Rising of the Shield Hero', the protagonist's unique skills make others, especially the female characters, gather around him. Another theme is relationship building. The main character has to navigate complex relationships with the members of the harem. In 'Date A Live', the protagonist has to understand and bond with the different female spirits.
I don't think it's a popular light novel. Firstly, the title itself gives off a rather uncomfortable vibe with the'slave' part. Secondly, in the current literary market, light novels that focus on healthy relationships, interesting plots other than just harems, and strong character development tend to be more successful. So this one might not gain much popularity.