Sibling Rivalry (Louis Tomlinson and Harry Styles Fanfiction)

Louis Tomlinson's parents was out of town to visit a friend that was sick. So Louis was left to babysit his sister Lottie and Louis ask his best pal Harry if he could babysit his sister with him. Days passed when they were together in the same flat. Did their relationship will move to the next level? Will Louis agree if Harry asks him if he could date Lottie?