This is a trilogy of historical m/m romances by KJ Charles, the queen of the genre. Now, anything penned by KJ Charles is a cut above anyone else's, imho,  so if you haven't read anything of hers, you totally should. Characterisation, plot, intrigue, smut, excellent writing, her books have it all. The Will Darling Adventures are set in London in the 1920s. It's a spy/action series with an amazing love story at its heart, where the conflict is absolutely real and the characters have an emotional growth arc across the three books. It's the most satisfying kind of romance. You will fall in love with the two MCs, it's impossible not to. Once you've finished the books you'll be left wanting more, so here's some fic to tide you over. These are all Kim/Will, with a touch of DS/Archie, and won't make much sense unless you've read the books, I'm afraid. Btw, the audiobook version of the books, narrated by Cornell Collins, is just sublime. 

the world is but a word. 1.6K words. Will was speaking with a customer when Sir Archibald Curtis walked into his bookshop. A lovely little vignette. Podfic availbale, though I haven't listened to it yet. 

scrape out what's left (at the end of the year). 2.2K words. The drive to Holmclere was uneventful, leisurely, and most importantly: not completely overshadowed by one or both of them being framed for murder. At least it had that going for it. Lovely epilogue for the whole seriesscrape out what's left (at the end of the year). 

one shade the more. 3.9K words.Perfect Will and Kim voice, their banter kills me. 

The Pitt

detect my sudden existence on your sonar by Lirazel . 25K words Mel/Frank. Mel thought everything would get easier when he came back. Instead, it's a new kind of torture. This fic is, to me, the definitive take on Mel's POV. I'm not on the spectrum, I've little experience with people who are, so I may as well be talking out of my arse, but reading this story is just such an immersive experience, ti does such an excellent job of sucking you in and making you feel like you're living it all as Mel would. And the pining is exquisite. So good it's almost unbearable. Gah.