Summer Love (a Niall Horan fan fiction)

Casey Edwards and Niall Horan are best friends, well boyfriend and girlfriend, but hey they're only seven years old! They do everything together, so Casey is completely broken when she hears the news that Niall is moving. What will she do without the blonde haired blue eyed boy? Ten years pass and Niall comes back leaving Casey completely shocked. But what happens when he brings back his new girlfriend Leah Mitchel with him? What happens when Casey confesses her love for Niall and things go completely wrong. Will they become something more again? Or will Leah threaten their relationship? What about when Niall has to leave at the end of the summer? Everything is tested.