Smile for me (Larry Stylinson AU)

Harry Styles joins in the middle of the school year and discovers that the schools’ favorite boy has changed completely this year. He used to be happy and fun, but now he comes to school with bruises and cuts. For a reason unknown to Harry himself, he is attracted to the boy and decides to make him smile again.

This is the best I could do for a description but I promise the story is better :)