Y/n is the daughter of the Slytherin Heiress, Eerika Malfoy which rumour says has passed onto you(at least according to Remus). Y/n never told anyone, not even the Malfoy's know that she is a Malfoy. It's a shock for everyone when professor Magonagall called out her name during the Sorting and even more shocking that she being a Malfoy expected to be in Slytherin.
Y/n is best friends with the trio especially Ron, you were best friends before Hogwarts.
Y/n and the trio have amazing adventures together and lots of dramas as well and she fell in love with the one and only The Chosen One.
so yeah I think that sums up this story.....
(I do not own any characters, all credit goes to J.K Rowling)