I want to write you a song

Harry writes songs in secret. Not because he doesn't think the others boys will like them. Harry can't show the boys, the songs his written, because there're about one of them. More specifically, there're about Louis. Harry writes these songs, so that he doesn't have to keep his feelings for Louis, bottled up inside of him.
Everything's going fine, Louis and the other boys, have no idea about Harry and his songs, that is until on day Niall finds the book, which contains all the songs Harry has written for Louis...