Is it acceptable to use both name and nickname when referring to my character?
Example: Vindici waited for Eustachio to make his way up the hill towards him. "What news?" Vindici asked.
"Well," Eustachio replied. "The duke is looking for a new servant. What do you say, Vin? Want to be a servant?" He Laughed.
Vin laughed with him.
This is not a passage from my work it's just an example for how the names are used. Now that the audience knows both name and nickname can I, the narrator, use both?