Here, how about we imagine dean winchester being your over protective older brother. you're 15 and hes in his 30's.

Harry was told there were four Marauders. That was a lie. Harry was told there were three unregistered animagi. That was a lie. In fact there was another. One that was never told. No one knows why, but maybe that’s because to Sirius, it was too much of a painful story to reveal. Maybe something had happened to the Secret Marauder, but whatever it was, Sirius lied, and he lied because of love. http://maddening-the-unhelpful.tumblr.com/post/87288455705/because-if-people-were-books-she-was-a-library

Maia Black, daughter of mass murderer, Sirius Black, is entering Hogwarts for her first time. After being guarded from the real world by her 'Uncle Moony' for thirteen years she wants to finally feel independent. Throughout the year she will have to face enemies, lies and dark secrets. Will she be able to cope? That One Marauder Who Captured My Heart >Beginnings Finding Happiness The Last Battle

HEAVY EDITING NEEDED Scarlett Dixon is a 17 year old witch that transfers to Hogwarts from Beauxbatons. As a secret metamorphmagus, she cheekily changes her appearance and wanders the school pulling pranks. She chooses the Marauders as her target , but Scarlett finds herself slowly falling for a Mr Black. If only things were simple - her life takes many dramatic twists and turns as she reaches adulthood.