Sold to Lycan King for Surrogacy

He is a 33-year-old Lycan King, I’m a high school graduate.
It’s rumored that he was cursed by his first love, a dark witch who betrayed him, rendering him unable to feel the presence of a mate and sire offspring.
To break the curse, he needed to find an 18-year-old virgin in the human world to serve as a surrogate.
That's when I was chosen, and my stepmother sold me to him, signing the contract.
During our first meeting, he coldly said, "Human, after giving birth to my child, you must return to the human world immediately."
The reason I was chosen is that I resemble his first love. Could it be that I'm just a substitute for him?
When I finally left the werewolf clan, he unexpectedly came looking for me with twin wolf cubs.
"Methis, please, be the mother of my pups."