Rescued By the Vampire Rogue by Luna Lockhardt

I never believed in monsters—until I was kidnapped and thrown into the dark world of the most feared man, Kael Dusken. My abduction shattered everything I knew, pulling me into a sinister game where my only ally was my enemy.
He was supposed to be a crime boss. Just a bad human dealing every kind of sin possible. Then I learned the truth… he was a blood dealer… and a vampire.
Except, as we hid from our enemies in his ancient mansion, the lines between prisoner and protector blurred, and I found myself in an uneasy alliance with him. Thrust into a reality where supernatural terrors lurked at every turn, I had to decide if the man who saved me was truly a monster—or my only hope for survival.