Yaya's school friend

When I went into the playground, yaya was still busy playing with her friend-Yifan. While I sat down on the bench with Peter to wait, the teacher asked me whether we and Yifan's family are somehow related. "No, I only met his mom once, Why?" "Because these two are playing so well and they are always together.." By that time, both Yaya and Yifan have ran to me. After simple greetings, I told Yaya we should head home. Now, the hugging scene came. Those two hugged and hugged, for quite some time, then before we realized it, Yifan pressed a very fast kiss on Yaya's cheek. It was so funny that all of us adults laughed. Later, when i talked about this with a friend who knows Yifan's family, she said"yes, his mom said that he likes to kiss those he really likes. One time in the library, he kissed a boy which made the boy cry..." Funny, sweet Yifan.