Back to 1900s, he's a very famous detective and you're a very famous writer. Your writings had brought so much impact to other people.

He decided to quit his job as a detective and just lived a peaceful life. Until, you came to bother him again with your new ideas and a new case for him.

Sure enough he declined, but knowing he couldn't resist you he accepted just for your sake. He was very much a strict and a serious person, even he doesn't know why he kept accepting your offers.