Finishing the formal greetings, Fiora said with a smile, "It's an honour to have a chat with the Prince."
This was said out of genuine respect from her as she was happy to see Lith show her respect and be so respectful.
This was also a common phrase nobles said when they were starting a conversation with someone of a higher status.
Lith, although knew that these were formalities, still felt awkward as Fiora was Dennis's mother. It would've been fine by him if it were any other lady, but his best friend's mother saying something like that didn't click well with him.
However, he had to act according to his status and couldn't bother to ask her to not say such things.
Lith simply smiled and replied, "I am happy that Duchess Fiora feels this way."
Now he was addressing her with her title because saying Mrs. Dracula all the time wasn't appropriate in such formal events.