Even in more liberal regions, there are still limits and regulations. These stories are not in line with the general social values of promoting a healthy and positive social environment, so they are usually restricted.
Yes. In history, like in the case of the comfort women during World War II. Japanese soldiers forced many Asian women into sexual slavery. These women endured great pain and trauma. Even today, human trafficking for sexual exploitation exists in some areas where poor and vulnerable women are lured or abducted and made to be sex slaves.
Definitely not. Ethical stories should promote positive values like respect, equality, and consent. Audio sex slave stories go against these values as they involve the idea of slavery in a sexual context, which is a form of abuse and violation of human rights.
There are many ethical concerns. First, it normalizes slavery, which is a completely unacceptable form of human (or in this case, fictional being) subjugation. Second, it often involves non - consensual and power - imbalanced relationships which are not healthy or positive. It also may have a negative impact on the perception of the Night Elf race, reducing them to objects of sexual fantasy rather than complex fictional characters.
No. Writing such stories is often not appropriate as they involve sexual content which is not suitable for general public consumption and goes against moral and ethical norms in most contexts.
The ethics of these stories are debatable. Some might argue that as long as they are clearly marked as erotica and are for consenting adult audiences, they are okay. But others may think that they objectify characters and promote a narrow view of sex.
Yes, they are likely only for adults. Given the nature of the content which is likely to involve sexual themes, it's not appropriate for minors. Society has norms and laws in place to protect the innocence of the young from such adult - oriented materials.