To prevent the spread of audio sex slave stories, we need a multi - pronged approach. There should be public awareness campaigns about the harm and immorality of such content. Internet service providers can monitor and block the transfer of such audio files. And, finally, international cooperation is important to combat this issue across different countries where such content might be produced or spread.
One thing is to have strict laws and regulations. Governments can enforce laws against creating or distributing such immoral content. Social media platforms and other media outlets should also have strict policies to block and remove any such content.