Fiction: Bone Rider by J. Fally features a romance between a human and alien symbiotic sentient armor…well, actually the male human’s romance is with another male human, and there is a plot involving the U.S. Army and the Russian mafia, but I was more into it for the sentient armor, which was totally cool. Really, do you need any more recommendation than that?
Nonfiction: The Regency Underworld by Donald Low – if you’re looking for a fairly short overview of this topic, this seems to be a good choice.
Fanfiction: This, You Protect by owlet follows Bucky Barnes after the events of Captain America: the Winter Soldier as he resets his mission objectives to keep Captain America safe. It has realistic angst mingled with Bucky’s sardonic humor and a lot of sentimental punch. It’s hard to describe, but a greatly entertaining story.