Draco and Hermione. (Pushed into friendship)
Only a crazy person would be surprised Hermione Jean Granger got Head Girl after the war.
Only a crazy person would expect Draco Lucius Malfoy got Head Boy.
But alas, the unexpected happens.
Hermione Jean Granger. The Brightest Witch of Her Age. The "brains" of the Golden Trio. The Gryffindor Princess. The Future Mrs Weasley( or so she thinks), becomes head girl of Hogwarts school of witchcraft and wizardry, the first after the second wizarding war.
Draco Lucius Malfoy. Son of a former death eater. The amazing bouncing ferret. The boy Hermione punched in third year. The pompous prat. The Slytherin Prince. The one who fixes the Malfoy name, becomes head boy at Hogwarts.
The Head's dorm is in the Room of Requirement. But only one bedroom for the both of them is a disaster in the making, or so you would think.
Both Headmistress McGonagall, and Professor Dumbledore agreed for a Gryfindor and Slytherin to be heads. More specifically, two mortal enemies, who would be brought together by this one simple action of sharing a room.