Wild Little Omega by Lucy Auburn

She came to slit his throat. He’s been waiting centuries for someone who’d try.

For three hundred years, the Beast King has slaughtered every omega sent to break his curse. Forty-seven women chained to his altar. Forty-seven names carved into stone. No one survives the claiming.

When Kess’s village demands a forty-eighth tribute, she volunteers—not as sacrifice, but as assassin. She’s the wrong kind of omega: feral instincts, predator teeth, a scent like rage instead of surrender. She’s hidden a knife in her hair. And she fully intends to die on that altar, as long as she takes the monster with her.
What she never expected was for him to beg her to run.
What she never expected was for her blade across his throat to make him smile.
What she never expected was to survive.

Now Kess is mated to the beast she swore to destroy—bound by a bond that makes her body crave the alpha her mind still wants dead. He swears he’s not the monster she thinks he is.
She still has a knife.
Forty-seven omegas died on that altar.
The forty-eighth is nothing like them.

A standalone dark omegaverse fantasy romance with explicit adult content. Contains dubious consent, primal heat/rut, knotting, enemies-to-lovers, and a morally gray hero who will do terrible things to protect his mate.