Marked By My Sister's Mate

"Adeline will replace Iris as my wife and Luna of the pack."
I spent my whole life loving Theodore from afar, knowing he belonged to my sister. I never dared to dream beyond stolen glances and silent wishes—until the night before their wedding, when Iris disappeared, leaving only a note saying she had run away with the love of her life.
Forced by my father and a heartbroken Theodore, I stepped into her place. But no one knew that, in a haze of grief and too much wine, Theodore had unknowingly marked me as his Chosen Mate.
Our marriage is a storm of guilt, rage, and forbidden desire. To Theodore, I am nothing more than a tool to secure his power and a reminder of my sister's betrayal. He resents me, punishes me, yet can't seem to stay away. And I, despite knowing his heart belongs to her, can't stop myself from wanting him.
Then Iris returns. She wants him back, and suddenly, I am the outsider—the woman who stole what was meant to be hers. The whispers begin, the stares burn, and Theodore… hesitates.
But just when I prepare to walk away, my true Fated Mate—a ruthless Northern King—appears, shattering every bond I thought was unbreakable. Theodore's possessiveness ignites, his obsession consumes him. He will fight for me, bleed for me, even if it means destroying us both.
Now, I am caught between a man who refuses to let me go and a mate I was destined to be with.
But when the dust settles, who will truly be mine?