Alpha's Substitute Bride

As the adopted daughter of her pack’s Alpha, Eloise married Alpha Atticus, whom she had liked for many years, in place of her sister.
Even after all the hurt she had gone through previously, she still thought that day was the best moment she had ever experienced.
“Do you think that if you married me instead of your sister, that I would fall in love with you? Your only use is to provide your sister with blood to prolong her life!”
In reality, Atticus was not a good mate to her, and he was also the one who destroyed everything she had in life. Eloise worked hard to mend their relationship, but her efforts were all in vain.
Her sister nestled in her husband's arms and said pitifully, “I hope you’re not angry, Eloise. Although your wolf is Atticus’ mate, he can’t feel it. He chose me to be his Luna.”
***
Eloise understood. It was impossible to replace what he wanted, much less give him the love that he desired. Now, there was only one thought in her mind.
She wished she could run away from all of this wrongness.
However, just as she was prepared to leave, she found that matters were not as she had imagined. She possessed far more than she ever imagined.
The next time she sat in the same room as Atticus, their identities changed drastically.
She realized that she must now follow her true feelings and make a decision based on the huge difference between everything she once knew.