The Stalker:

The first time I saw my little bird, I knew she belonged to me.
She's new to the city, all alone. She doesn't know who I am, but I've been watching her. Stalking her in the shadows, keeping her safe. Killing anyone who threatens her.
I've built a cage around her, luring her in. And when it's time to reveal myself to her, she won't be able to escape.
In every way, she will be mine.

His Perfect Darkness is a dark billionaire romance with intense, sensual themes. It is book one in a duet, so beware the cliff.