I recommend "From the Conquest of the Dark Lord". This novel is a modern romance novel about wealthy families. The male and female protagonists are both human, and there is no restriction on the female protagonist's genre. Although Sherlock and Curly Fortune weren't explicitly mentioned, as a novel about a wealthy family, the male protagonist should have high intelligence and detective abilities. He was a Dark Lord of a wealthy family. The female protagonist was a demoness with an arrogant and despotic personality. Her personality was similar to Sherlock's. It was worth mentioning that the novel also met the requirements of Little White Mary Sue Pass. I hope you like this fairy's recommendation. Muah ~π