Hunger.
The need for.
The taste for.
The want for.
The mind controlling.
Appetite is hunger.
Appetite is the need for something desired.
Appetite is the taste for danger, for love, for hate.
Appetite is the wanted lust, fire, pain.
Appetite is the mind controlling object that you live for, you will die for, you will kill for.
A vampire's appetite is for the taste of, the want for, the mind controlling feel of BLOOD.