Malicious Prince by Mary E. Twomey

Sometimes sacrificing your heart isn’t enough.

Lily escapes with Salem and Destino to shifter territory, where deception lurks around every corner. With the Queen of Jacoba unable to rule, too much responsibility falls to Lily, who realizes she will never be the princess the shifters want. However, she quickly learns that she might just be the ruler they need.
Mating with Prince Salem wasn’t in the plan, but now that Lily’s fallen for him, her marriages to Prince Destino and Prince Alexavier are put to the test. Sharing seemed like a good idea in the beginning, but when passions run high and the stakes are higher, the Territorial Princes have to decide if they want Lily for themselves or peace for the nation.