...yes, I wonder about strange things when I drive, lol. But...no one ever really says. If vampires suck blood, how does the blood get from pt A to pt B? Are their fangs hollow, and if they're hollow--do they have special tubing-like passages in their gums to shoot the blood down into their throat? Or does the blood go up into their sinuses so they're breathing in blood?
And if they don't--does this mean they have hollow teeth with holes in the back of them and blood runs up them like little straws? Or...do they puncture, retract and suck? In which case, why don't they have prehensile lips?