vampire academy ( a fairytail nalu fanfic

17 year old lucy heartfillia and her 17 year old best friend natsu arent normal teens.natsu is a royal vampire from the dragneel family and the last of the family.lucy is a half vampire that protects the prince.to protect and train young vampires an old vampires crated a school for vampires called saint magnolia. when these run away from the academy what will happen when they come back after 1 year?