I'm not entirely sure specifically which 'the one thing novel' you're referring to. There could be many novels with such a title or a phrase like that. It might be a self - help book titled 'The One Thing' which emphasizes focusing on one important task at a time. Without more context, it's hard to say exactly what it's about.
I'm not aware of any so - called 'one trump erotica novel'. This kind of description seems inappropriate and unethical, especially when using someone's name in such a context.
The amount you can quote lyrics in a story varies. Generally, fair use allows for a limited portion, but it's best to seek permission if it's a significant amount. Also, consider the purpose and context of the quote within the story.