Bound to the Beast I Was Sent to Kill

In frozen Etherlan, Beast King Lyran claims a sacrificial princess yearly — none survive. Assassin Kaira is sent to kill him, but her blade reveals a cursed man trapped as a lion, healed only by her blood. He crowns her Queen, and they fall in love until poison threatens Kaira. Lyran binds his fate to hers; she carries his child. Elara betrays them, but dies defending the North, and their child's power saves them. A year later, they find their newborn bears the curse-mark.