The questioned embarrassed Noctis and it showed right away on his face as he looked away from Sanji. He busied himself by picking up his laundry and throwing it into the basket that was in his room.
"...I know my letters but I can't... I'm not a strong reader." Noctis had been able to get by without running into the need to read a lot of things but not being able to read well had caused some jobs to go badly as well.