Is a person with narcissistic personality disorder incapable of directing a conversation from anyone but him or herself?

Unfortunately not: By the nature of the condition of narcissism, if someone truly is a narcissist, s/he cannot thanks for many prospective other than from his/her own. Hopefully this is not the case or the person is not truly narcissist.

It's all about him: Narcissistic people treat others as if they're disposable objects. Once your utility is gone, there is no more interest in you. Your separate needs are unrecognized. Relationships with a narcissistic person may vary between sharing the mutual glow of "specialness" while you're useful, and complete disregard when you're not. Things might feel intimate and good for awhile, but then the ice comes.