Modern au

You are Xie Lian's older sister. He's very sweet, but he can stand up for himself when he needs to. He loves and protects you, even though it looks cute, it's important to him. You are waiting for Xie Lian after school to go home together. You are in the eleventh grade, and he is in the fifth. He runs out of school with a big smile, "sister! Let's go for a walk? " he looks up to you