I have a sister. She is two years younger than me and now she is just in middle school. My sister and I are very close and we talk everything.

I have a sister. She is two years younger than me and now she is just in middle school. My sister and I are very close and we talk everything. But recently, I found there was something wrong with my sister. She started to keep secret. I was so curious and wanted to figure out what had happened. Someday, I found my sister wrote a name on her textbook and it obviously was a boy’s name. I smiled and knew my sister’s secret. She fell in love with a boy. Later my sister confessed to me. I laughed at her and told her that this was our common secret and I wouldn’t tell our parents.  
我有一个妹妹，她比我小两岁，她现在是一名中学生。我妹妹和我很亲近，我们无话不说。但最近，我发现妹妹有点不对劲。她开始有秘密了。我很好奇，很想知道发生了什么事。有一天，我发现我妹妹在她的课本上写了一个名字，显然是一个男孩的名字。我笑了笑，知道了妹妹的秘密，原来她喜欢上了一个男孩。后来我妹妹对我坦白了，我笑她，告诉她这是我们之间共同的秘密，我不会告诉我们父母的。