You want to be a hibrid of vampire and mermaid?

You are a human girl called ana who fall in love for a man hibrid of vampire and mermaid who fall in love for you and say: you want to be a hibrid of vampire and mermaid? you will can turn in a vampire with human legs or a vampire with a mermaid tail, You will have to drink blood and you will have fangs. I not have a good image to my scenario. Sorry