Straight to it, I devoured 'A Dowry of Blood' by S.T. Gibson recently. It's not your standard romance—it's a fragmented, lyrical confession from a vampire's first bride to Dracula himself. The prose is lush and gothic, the power dynamics are deeply unsettling in the best way, and the queer relationships within the polyamorous coven feel achingly real.
For something with more of a modern bite, I'd point you toward 'Sacrifice' by Adrienne Lecter. It's a wild mashup of sci-fi and vampirism with a slow-burn M/M dynamic that genuinely surprised me. The world-building is dense, and the horror elements aren't skimped on, which makes the moments of connection feel hard-won.
Honestly, a lot of the really good stuff lives in the self-pub or indie press spaces where authors can really dig into the dark, morally grey characters without pulling punches for a mainstream audience.