The trio are invited back to Hogwarts to finish the education they missed out in their seventh year (original concept - I know). However, McGonagall requests that they stay in the Slytherin dorms due to a bullying incident. Oh my god they have to share a dorm with Draco, who coulda guessed it. Anyhoo, I'm a sucker for Drarry, so the plot's pretty easy to guess. Hope you enjoy, leave a vote etc, etc...