A 19 year old girl Heather, is Harry Styles' little sister. She stays with Harry for awhile, and straight at the beginning she begins to fall for Liam. Can they hide eachother from Harry and the rest of the boys? Or will the truth come out? To find out please read my fanfic 'My Brother's Best Friend' Thanks! *** Thirstynxrry's Other Books: 1: Liam Payne - My Brother's Best Friend // Completed 2: Harry Styles - Only As a Friend // Completed