Crossover with Harry Potter
Looking for a crossover with Harry Potter where Sherlock is in a relationship with/I think engaged to female Harry. She is much younger than he is--she's in the middle of the war--and I think that Sherlock believes that she's a criminal because of war-related things? I know I'm not giving a great summary, but I would really appreciate it if anyone knows the story. Pretty sure I read it on AO3, but my searches aren't turning anything up.