Harry and Louis have been friends since they were young, only living a street apart for years. They played with toy trains and paper airplanes, they walked into their very first and very last day of primary school hand in hand, they asked each other embarrassing questions that left their cheeks tinted pint as they navigated puberty through middle school, they shared their first kiss together because they were too nervous to ask anyone else, they blurred the lines constantly between friendship and something more.