Posh Boy (слэш)

John Watson as a professional prostitute? You fucking know he's not bending his pride to be one. John Watson got back from the war, decided civilian life was boring, and took a dangerous job deliberately. John Watson, prostitute, has actively helped very powerful men stumble their way into prison because they treated other sex workers badly and John Watson doesn't Stand for that. John Watson is teased about being "a John" but he's not really one, he just sees people who end up in this life not because they had a choice but because they were tossed onto the streets, and he bandages them up and he gives them tips and if they don't want to sell their sex he finds them other jobs.
John Watson is a sex worker in the same way that Olympic ice skaters are just people who slide around on ice.
Sherlock Holmes, who inherited a business from his father and lets his brother run it and hates the upper-class nonsense he's stuck in because he wants to make a difference in the world, Sherlock Holmes who owns an entire estate but prefers to live in a flat rented by an old lady in the middle of London, Sherlock Holmes -- stalls out a car on a street corner in Soho at 3 am. And meets John Watson.