I want to know know what kind of literature is okay to write about.

I want to write some novels just for own referance but I don't know if this is okay. Basically my stories are on muslim couples (all fictional). Thet all have happy endings becuase I can't stand people going through grief right till the end. These couples will basically go through problems such as violence,miscarriages abuse etc, and the books will show inshallah how they deal with them and will inshallah have a moral in the end.