I tried to read Black Obsidian by Victoria Quinn and had to stop much earlier than I intended. Total BDSM focused SMUT fantasy. If that's your thing and you want some edgy pure porn reading, go for it. Nothing relatable about it though and the characters don't act like real people.
Still working through my free book list and mostly DNFing them for one reason or another. This turned out to be a pleasant surprise! Right off the bat, he had me hooked narratively. A great post-apoc in a world of summer blizzards, government surveillance, and depreciated currency, where antiques is the business to get into. Loving it so far.
I'm really digging the space opera aspects, but I think I'd prefer if he called it straight up magic rather than maths. I've seen a few technical terms tossed around but not in a way that makes sense, and familiar jargon being used improperly breaks immersion for me. But the plot and characters are otherwise spot-on, and I've picked up the second book to continue with.