I want to clarify one thing, or ask a question, or both at the same time. How are you using the term narcissistic here and in this post. One usually does not become a narcissist. People are born that way and they don't change. I said usually because there are exceptions, for example someone who is an empath and enters into a relationship with a narc can become one. My psychic calls that an empath who goes supernova.

All that being said, anyone can start to act more narcissistic than they were, but behaving in some ways narcissistically does not mean one is a narcissist.