lycan's rejected mate novel

"Margaret, you're the older sister, you have to give in to the younger one." In her whole life, those words clung like a curse to Margaret. Whether it was her beloved teddy bear, pretty dresses, Halloween candies, or parental love, if Elizabeth asked, she had to unconditionally yield them all up to her. Since young, Elizabeth had weighed down on Margaret like an enormous mountain and suffocated her. Fortunately she still had a boyfriend who had loved her for six years—Amster, the pack alpha. "You will be my wife and the future luna of the pack," He promised. Until the day when she and her sister was turning 18 years old, and Amster's lover and fated mate turned out to be her twin sister Elizabeth! Margaret watched as Amster, who had said he loved her, passionately kissed with Elizabeth, and announced Elizabeth as the luna without a second thought. The only emotional sustenance Margaret possessed crumbled; once again, what belonged to her had been snatched away by Elizabeth. What's worse, Amster even asked Margaret to entertain the guests. All because Elizabeth knew nothing except how to wheedle and dress herself up. Unable to refuse the request of her former lover, Margaret agreed to this...