This kind of description implies inappropriate and unethical content. There should not be such a so - called 'appropriate story' in a normal and moral society.
No, it is completely inappropriate. Such topics are private and inappropriate to share with a parent, especially a mother. It violates social and family norms of propriety.
Another story could be that a son gets into trouble at school, and instead of scolding him, the mother patiently listens to his side of the story and helps him figure out how to make things right. It shows the mother's understanding and wisdom in handling the situation.