I find it hard to believe that there are such processes, to begin with. Research failed to find any substantive difference between the psychological make-up of a narcissist who happens to have homosexual preferences and a heterosexual narcissist. They both are predators, consuming Narcissistic Supply Sources as they go. Narcissists look for new victims, the way tigers look for prey they are hungry. Hungry for adoration, admiration, acceptance, approval.
Old sources die easy once taken for granted, the narcissistic element of conquest vanishes.
Conquest is important because it proves the superiority of the narcissist. The very act of subduing, subjugating, or acquiring the power to influence someone provides the narcissist with Narcissistic Supply. The newly conquered is an observer, which idolises the narcissist and a trophy. Moreover, the act of conquering and subordinating is at its apex in the sexual encounter. It is objective and based on the primordial and atavistic.