A rough plot outline:
My character, who can be an OC or Chritine herself, has lived int he opera house for some time. Her mind has been plagued with dreams of this man who plays haunting melodies and is lost in his own solitude. When she finds a series of events happening around her, the man from her dreams becomes reality after she was brutally attacked by one of the patrons of the opera house. After the man cares for her until she is fully healthy, he finds that he cannot get her out of his mind. The way she smells, his obsession with her naive innocence and what he blood may taste like. Everyone that he kills, he kills to protect her.
He is relatively wealthy and has a chateau outside of Paris. When his protection turned deadly, he finds his woman and takes her there. Free from the spotlight, he decides that one taste would not kill him. Sadly one sip turned into two and the more. She was nearky drained dry. However, she was not murdered nor turned. She lost a lot of her memory and he uses that to his advantage. He manipulates her into thinking they were engaged and his servants follow it.
Thats all I got in my head so far.