The Patronus Incident - Slytherin AU Drarry

This is a darry fanfic. If you dont like drarry, please click off. You have been warned.

This takes place in 5th year.
When THE Harry Potter is sorted into Slytherin house in a Hogwarts re-sorting conducted by Dolores Umbridge, everyone is shocked. However, Harry makes friends quickly in the form of Pansy Parkinson and Blaise Zabini, and (to everyones dismay) eventually Draco Malfoy.
Chaos strikes Hogwarts and Harry starts up Dumbledores Army. In one lesson however, they are practicing Patronus making. Draco decides to turn up to this lesson, and conjures up a stag patronus.
The are a following number of Drarry incidents- but can these lead to anything? How will everyone react?

Cannon Divergant.
I do not own any of the characters - all belong to JK Rowling and the fandom of Harry Potter.
Ships: Drarry, Pansmione, Blairon, Linny, Deanmas.
This is my first fanfic so i dont know how its going to go, but support is appreciated! x