Why can my brother play coquetry with my sister, but he can't be her little cotton-padded jacket?

Because my younger brother is a boy, China is a big country with 5,000 years of culture. This is a tradition in China, and a tradition in China is that men and women are different. The education that China people have received since childhood is deeply rooted. As long as the two brothers and sisters are on good terms. There is nothing wrong with a small cotton-padded jacket. A boy has a big heart, but it is ok to have your sister in his heart. Brother and sister relationship is the closest person besides parents. A younger brother can play the coquetry with his elder sister, who will protect his younger brother. With the growth of age, my brother will become a man, protect his sister and warm his heart!