A Promise Worth Keeping (Larry AU)

*Completed*
Louis Tomlinson is a multimillionaire with everything he could possibly ask for. To top it all, he had the most amazing daughter in the world. Her name was Harper and she was five years old. the problem was that Harper was a stage two leukemia patient. Since Louis was always on business trips, he needs someone to look after Harper so that's why he would always hire nannies after nannies, but they would leave in like a month in fear of a little girl dying in their hands. But harry Styles was a professional nanny as those might say. He heard about the job from his best friend Niall and immediately accepted it cause he loved taking care of kids.

But what happens when harry gets too attached with Harper and the same for harper? what happens when Harry promises Harper that he wouldn't leave her like the others did? will he be able to keep that promise? And more importantly, what happens when Louis and Harry start falling for each other? will that be a good or bad thing?

This story is completely mine, so please ask me to translate please tell me if someone tries to copy it! I worked really hard on this.