Rejecting My Lycan Mate

"I, Madeline Clark, rejec..." I started speaking, but Alpha Dimitri stopped me by placing his hand over my mouth. He pulled me closer to him and growled.
"I'm not accepting your rejection, Madeline," he growled. "You are my mate. You are the greatest gift that the Goddess has ever given me. I am not letting you go."
My heart was hammering against my rib cage. His scent overwhelmed my senses. He leaned in and rubbed his nose up and down my jaw. My skin was on fire. Every part of my body desired to be touched by him.
"I can't let you go, my love," he mumbled. "I've waited for you my whole life."
His lips brushed against the marking spot on my neck, and I almost burst into flames. Convincing him to accept my rejection would be the hardest thing I ever had to do.
Madeline is a 17-year-old girl who still hasn't shifted into her wolf. Her father abandoned her mother when she was very young. She has been bullied and laughed at all the time. After she lost her mom, the person who loved her the most, Madeline is completely distraught and broken. Her father comes back to take her back to his pack. Madeline is against it, but her financial situation forces her to go with him.
Dimitri is a Lycan wolf, the Alpha of his very successful pack. He is 22 years old, and he still hasn't found his mate. When Madeline arrives at his pack, he is very surprised to discover that she is his mate. He is also frustrated because she is his stepsister who hasn't shifted yet. She can't recognize him as her mate.
Madeline struggles in the new pack. She doesn't have the best relationship with her stepmother. She can't wait to turn 18 and leave.
What will happen when Madeline finds out who her mate is? What will Dimitri do after she rejects him? Will he be able to convince her to stay? This is book 3 of the story.