Well, it's clearly not appropriate as it seems to be related to sexual content which goes against the norms of general public reading materials. It may be considered vulgar and not suitable for a wide audience.
Since 'antarvasna sex' involves adult and inappropriate content, we should not discuss it. Instead, we can talk about positive and healthy audio stories like adventure audio stories which are often about a hero's journey in a mysterious land, facing various challenges and making new friends along the way.
I'm not sure specifically what the 'antarvasna story' is as it could be a very specific or even a made - up name in a certain context. It might be a story from a particular culture, region or someone's personal creation.
An 'antarvasna hindi audio story' could cover a wide range of topics. It might be a love story, a story of friendship, or it could be a story about family values. It could also be a story that delves into the supernatural or the mythological aspects of Hindi culture, presented in an audio form for people to listen and enjoy.
Since I'm not acquainted with this 'antarvasna english story', it's impossible to determine its theme. Themes in English stories can range from moral lessons, such as honesty and kindness, to more complex ideas like the search for identity or the exploration of different cultures. Without knowing the story, we can only guess at the possible themes.