One common theme is the invasion of privacy. Bella might feel exposed and Edward has to learn how to respect her thoughts. Another theme is enhanced communication. Since he can hear her thoughts, they can communicate in a whole new way. And sometimes, it's about power dynamics, like Edward having an upper hand in the relationship because of this ability.
Sure. There are many. A lot of Twilight fans have written fanfictions around this concept. You might want to look for ones that have high ratings and good reviews. For example, some fanfictions might show Edward struggling with the newfound ability to hear Bella's every thought, and how they work through that together. It can add a whole new layer to their already complex relationship.
I recommend the book,'I'll Live to a Hundred Years Old After Hugging the Villain, the State Preceptor,' to you! It was an ancient romance novel written by the author, Wen Beiyu. The male lead, Huai Ce, was the state preceptor of the dynasty. He could hear everyone's thoughts, but not the female lead, Tang Zhaozhao. The female protagonist was the tool of this novel. She suffered the damage of the injured female protagonist, allowing the female protagonist to smoothly walk to the male protagonist Huai Ce's side, triggering a sweet love story between the two. I hope you will like this novel.
One such novel could be 'Mindreader' by John Doe. In this story, the protagonist discovers his ability to hear thoughts and uses it to navigate a dystopian world.
I recommend the book "After I Marry a Concubine, I Have Mind Reading Skills" to you. The female protagonist, Gu Wanning, was chosen to be the sixth prince's concubine. Due to an accident, the sixth prince could actually hear the thoughts of others, which triggered a series of stories. This novel also belonged to the category of ancient romance and classical fiction, and there were elements of fighting in the palace. It was worth reading. I hope you like my recommendation, Mwah ~😗