The Anniversary... {A Niall Horan Story}

Two hearts beat for each other. Niall and Aru are like the IT COUPLE. Everything was going fine until Aru realised that Niall was hiding something from her.
Link-ups of Niall and Demi has started and Aru than caught Demi in Niall's Backyard.
Would Aru be able to understand the situation?
Are Niall and Demi Just Friends?
What is it that Niall is hiding from Aru?

Findout by reading it...