The Kill Order [Larry Stylinson]

Louis Tomlinson is a 21 year old professional hitman who works for a secret organization put together by assassins, drug lords, etc. Ever since he was a young age, he's been trained to be a killer. When necessary, to behave like a killer, negotiate like a killer, & most importantly, think like a killer.
Harry Styles is an 18 year old college student, who's father has recently passed due to an "incident" at work. On his death bed, Harry stood next to him as his father revealed everything there is that he's been hiding, including a little insight to his involvement with the aforementioned organization. Because of this, Harry is put in a dangerous situation even though he doesn't know it yet.
When Louis gets assigned to assassinate Harry, things take a turn...

(not associated with The Maze Runner series)