Omega Mate

To rescue her younger brother, Molly was compelled to take her stepsister Kylie's place in an arranged marriage to the ruthless Alpha King. Unbeknownst to her, numerous dangers lay ahead.
The Alpha King, known as the most arrogant, cold-hearted, and powerful werewolf in the kingdom, agreed to the marriage because he needed to find his fated mate—a mate prophesied to save him from his uncontrollable rage. He never anticipated that he would gradually fall for this gentle omega girl.