Draco Malfoy and Harry Potter assumed they would never be anything but civil enemies, until Potter lands on Malfoy's doorstep, bleeding, covered in curses, and acting very strangely indeed.

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Draco Malfoy and Harry Potter assumed they would never be anything but civil enemies, until Potter lands on Malfoy's doorstep, bleeding, covered in curses, and acting very strangely indeed.
Harry and Draco are forced to kiss over and over again, because that’s just what happens to two arch-enemies around Christmas.
Draco has a potions accident at work that results in some interesting side effects.
Harry gets cursed during an Auror mission and suffers through some strange effects.
(or, Harry is temporarily turned into a girl, and Draco doesn't mind one bit.)
New chapter added 12/2016
Hag magic is capricious and unruly, and Harry and Draco are bound to stay by each other’s side until they can solve the riddle. In between long car trips, misty rain, and midnight star charts, they begin to understand each other.
A perfect match, a romance for the ages, with a one hundred percent success rate! Magic Match claims they can give Draco all of this. So why do they keep sending him on dates with Harry Potter?
“Don’t you think I would have gone to Pomfrey if I thought she could help me?” “Then what can I do?” “I nee—” Malfoy broke off with a soft grunt and a pained expression. He took a shaky breath and tried again, his voice wobbling. “Will you touch me, Potter?”
Draco is cursed to speak in questions. Well...Spelled, thanks to the stupidly improper archival practices of the fourth century. Harry Potter is there to save the day, but Draco isn’t going to give in to his help so easily. Fortunately, the method of saving might be more satisfactory than Draco expected this time.
Accidental bonding. Breaking and entering. Conspiring, however unwillingly, in the strange one-man war Malfoy's waging against detention. This isn't the normal school year Harry anticipated having, but at least it's not boring.