... you many not be immediately aware of the presence of this (narcissistic personality) disorder in a person until she feels displeased with you in some way. Initially, in fact, if you have something that an NPD (narcissistic personality disorder) colleague wants, such as status, money, power, beauty, etc., she may pursue and shower you with attention in an effort to gratify you. However, as soon [as] you become more closely involved with her, you will begin to feel the current of the one-way street. At first you may simply feel a sense of frustration that this person tends to distract you from your work, perhaps requiring an excess of attention and support. Inevitably, over time, you will have stronger feelings of frustration and exasperation, as well as a growing uneasiness about the relationship.
-- Eleanor D. Payson, The Wizard of Oz and Other Narcissists, p. 146-147