Two narcissists of the same type (somatic, cerebral, classic, compensatory, inverted, etc.) cannot maintain a stable, long-term full-fledged, and functional relationship. But if the narcissists involved are of different types, if one of them is cerebral and the other one somatic, a long-term partnership based on the mutual provision of Narcissistic Supply can definitely survive. (From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)