In other words, if the narcissist believes himself to be sexually irresistible - he will ignore and repress any behaviour by others and anything said to him which would contradict this belief. If she accepts his invitation to grab a snack during lunch break - the narcissist will inflate her acceptance into full scale enthusiasm and reaction to his own irresistibility. In his imagination, her acceptance is tantamount almost to actually having had sex with her. You are doing the right thing. Nothing to do with narcissists but get away from them.
Narcissists are very charming and enticing.
The fetid smell of rotting, suspend souls. The narcissist subliminally, covertly and overtly bribes the members of his entourage, moulds them, corrupts them, mutates them, exploits, abuses and wields over them the threat of being discarded. These temptations are hard to resist. These threats are hard to ignore. He offers the same commodities to his superiors.