Book recs for someone who *loves* BG3?

Hi, long time lurker, first time poster. I’ve been playing Baldur’s Gate 3 for the past year or so, trying out various different romances and I’m hung up on two: Gale and Karlach. I’ve been dying for a book to make me feel like their storylines make me feel. I’ve been scouring the internet for book recommendations, but none so far have really done it for me. I was hoping posting here might help me find a good book or series to read by the fire for a while.
I’ll even take some Astarion recs if you’ve got them :)