I'm sure you know the story of Narcissus (The Self-Admirer), who was punished to fall in love with himself because of unrequited love.
Narcissists, live the life with an addiction to their own fantasy life.
They are autoerotic, psychosexually in love with themselves, with their bodies or with their brains.
Narcissist that is cerebral type of narcissist, is usually, asexual.
He masturbates regularly and very mechanically.
Male narcissists, regardless of their sexual orientation, placed more emphasis on relationships with men.
The man in your fantasies i guess represents an ideal of masculinity, hoping for your self to be initiated into the world of men and masculinity.
Or this man can be just a reflection of you, ideal you, who needs to punish the bad boy.
It's very characteristics for narcissist to be a masochist.
The narcissist often seeks pain, humiliation, punishment (his inner voices keep telling him that he is bad, corrupt, and worthy of penalty) to feel re-born.
People who prefer autoerotic sex are also fetishists with the fetish being their own bodies.