Court of Flame by Miranda Martin

The former mad King Emberich is back and out for vengeance. He wants to destroy Sven, my love and sovereign, for daring to stand up to the crazed, bloodthirsty tyrant.
I have to stop my father, nothing else matters.
I’ve got allies, sure, but if I call on them there’ll be open warfare between the Dragons and the Phoenixes. No one wants that, least of all me.
I know what Sven would say. I should let him go rather than risk everything. But that’s not going to happen.
He’s mine, I’m his, and I’m going to solve this. My heart wars with my duty but I refuse to let either one go.