Don't Tell Mum and Dad [Larry Stylinson AU]

Harry and Louis are normal stepbrothers, but are complete opposits; Harry is a goody two shoes, teachers pet and caring person, while Louis is a joker, school rebel and only cares for himself. These brothers are constantly fighting and have nothing in common apart from one website: Wattpad, where they secretly fanboy over their otp: Lashton.

When the boys begin talking over this website, they fall ever so slightly more in love with each second passing, but what will they do when they find out who the other really is? Will they forget everything that's ever happened, or will they continue what they started online? Also, what happens when one of their sisters finds out? Will /she/ tell their mum and dad?