I said, "It's OK," although I was not sure what he was asking. Then, he picked up a blue pen from his pocket, and started drawing something on the back of my left hand.
A few minutes later, I found that he tried to draw Doraemon, a famous cartoon character.
I was so impressed because his behavior was not only cute but also the Draemon he drew was really cute.
Unfortunately, it seems like that he used an oil-based pen to draw it, so it never disappeared after taking a bath. However, it would be OK because I am always proud of my kids.
My concern is why he drew Draemon on my hand, but I am still unaware.