Gluttony
Gluttonous vampires have difficulty taking their sustenance in moderation. To the mind of the gluttonous Cainite, why stop when one is merely sated? Why not drink in the heady vitae until one is full as a bloated tick? This derangement is particularly common among elder vampires, who have indulged their vices for so long they lack the ability to control their hunger.
Vampires suffering from gluttony must spend a point of Willpower when they wish to stop feeding from a vessel, unless they have reached their maximum blood pool capacity. Also, a gluttonous character automatically frenzies when confronted with the sight, smell or taste of blood when hungry (at 1/5 blood pool or less).