Cursed to be Mine

HURTING MY GIRL IS AN UNFORGIVABLE SIN
My neighbor doesn't know I have a key to her house. Doesn't know I watch her sleep or that the dreams of me she has aren't merely dreams. She doesn't know she's my girl, who I've claimed in a blood ritual that will bind our souls together.
When she goes out hunting for the supernatural, she draws the attention of Antonio Garcia, alpha of the werewolves and head of a rival gang. He'll attack her to get to me, to deal a blow to my Family that will weaken us in the coming war.
But I am the reaper who haunts the night. And anyone who hurts what's mine will not live to see the morning.
Only...Antonio is consuming something that is causing his power to grow exponentially. When he becomes too strong for me to kill, how will I protect my girl?