They've been together from the very start. From the day they met at the X factor and were put in the same band, there was this... let's call it "click" between them that nobody could explain. They just felt comfortable in the other's companion and wanted to be together, play together, sing, hug, touch... just everything. Sure they were very close with the others as well and had their own special relationships, but there was no other bond as the one between Harry Styles and Niall Horan.