Fallin' All In You | S.M. & A.H.

Ariana Horan is the younger sister of Niall Horan from One Direction. She is 18 years old but soon trying to be a singer like her brother.

Niall Horan is the older brother of Ariana. He is very protective of Ariana

Shawn Mendes is Niall's best friend but he has a crush on his best friend's sister

Will Shawn tell Ariana how he feels or will she turn him down? What will he do when he finds out she feels the same? Read on to find out