Little N appears to have suddenly realised that Master Q can say his name (which isn't a new thing, it was one of his first words)
The conversation went like this:
Little N: "you can say it. Say Natie"
Master Q: "Natie"
Little N: "you are so clever, I am so proud of you"
I can only hope they will still be as sweet to each other in 10 years time!