They have nicknames for each other. She called him a big puppy and he called her an angel on earth. James is closer to Bella because she was his first N'ek in lakorn and they are koojin. I felt that when James was with Yaya in public he was more reserve and kinda careful around her.
Like Jellyfish mentioned, James also said he likes Yaya's personality. James is young and playful; Yaya is a tomboy and playful also. She can be goofy and funny and doesn't worry if she would look silly. People even said they felt sorry for Pa Jeaw, the director because he had to work with "the two monkeys" on the set.
I just learned more about James because of him playing with Yaya in NNS and I like him so far. I like that he gave answers out of the box and not typical and politically correct. When asked which actresses is the prettiest? Most actors would say, "Each actress is beautiful in her own way and each is unique in her own ways. "
At the Today show for NNS, the host asked James which lady is the prettiest: Noey, Michelle, or Yaya?
James answered, " In this case, allow me to be the prettiest." Yaya complimented him and said good answer.
I also like his sense of humor. When people said he is good looking, he asked them if he was good looking when he was born or when he first woke up in the morning, lol.