The Princess, Her Dragon, and Their Prince - The Fey-Touched, #1

A standalone polyamorous fantasy romance, set in a mortal realm through which the fey lands pass. After Mereni is conquered by a vicious dragon, Mereni's king-in-exile is willing to do anything to save his kingdom, including promising half of it and the hand of his daughter, Princess Cherish, to whomsoever stops the cruel beast. With luck, he reasons, one or more of the neighboring kingdoms will come to their aid, and some eligible prince will claim his daughter's hand.
Perhaps even some palatable individual, like the handsome Prince Eclipse, who is already on friendly terms with Cherish. It does not occur to Cherish's father that she might have her own ideas about whom she should marry ---- Or that the best individual to stop a dragon is, of course, another dragon.