I'm not sure as the term'secret chest' is rather ambiguous without more context. It could potentially be a special box or container with a secret related to it in the context of the story.
No, it's not okay. These types of stories are not suitable for public discussion as they are disrespectful to others and go against good taste and propriety.
No, it is not appropriate in most social and moral contexts. Such a story involves vulgar and inappropriate content that goes against the norms of respectful communication within a relationship and in society at large.
Well, in a fictional secret story, it might represent a hidden or taboo aspect of a relationship. It could add an element of scandal or secrecy to the narrative.
Cheating is an unethical behavior that can cause great harm to relationships. However, creating and spreading stories with vulgar content is not appropriate. We should focus on positive values and healthy relationships.
Sharing this kind of story is not acceptable. Intimacy within a marriage is a private matter. It violates the privacy and respect that should be maintained in a relationship and in society in general.