I Am A Vampire

I will get you.
You will pay, I hope you know.
I am a vampire to you.
I will sneak up and get you.
I'm bad.

And I was afraid.
I will see who I was.
You were the child that I once knew.
I am a saint; I will haunt you at night.
I am the dog that you feed.
Won't you feed on me?