Sunshine (Narry AU)

Niall was autistic. Always had been, always will be. He is the adorable, naïve, and friendly boy with the too blue eyes. Even though people would deme him as 'special', he was a wiz at calculus and the guitar. Zayn is Niall's overly protective older brother. Zayn would literally kill anyone who even thought about hurting Niall. Zayn has been protecting Niall since the little blue eyed bundle was brought into the world. Zayn becomes even more protective when there's a new bad boy in school. Harry is covered with tattoos, has a few piercings here and there, he drinks, smokes, the whole lot. But he soon finds an interest in the oh so innocent Niall, making it that much harder for Zayn to keep him away from his little brother.