MaiJiang
Pre-war Hogwarts. Harry is back, changing ever since . Draco too, has started to change.
The two, could stand each other a bit, but in some cases not.
Though, potions class forced otherwise.
Snake pairs Potter and Malfoy, for which forced them to brew an experimental concordance potion, an old piece of magic intended to be used on those who do not cooperate.
They screw up.
Instead of temporarily synchronizing their magic, the potion creates a bond that lasts several weeks.
The catch was, there was no "right" solution. All they could do was break the bond by genuinely trusting one another. Otherwise, there would be no change of the effects.
They have to sleep within the same area. And their magic reacts violently when they're angry at each other, and if one of them gets injured, which then the other feels a weaker version of it.
The first week, was hell.
But gradually, the bond starts exposing things neither of them intended to express.
Weeks pass and, they have their ups and downs. Insulting remarks and comments, even names. But names, they quite had the time with that.
During those weeks, they get drunk, calling each other. Everytime the other called, the one receiving, can't control themselves.
Atlas, going through their last couple weeks,
Draco knew the potion wasn't what made them fall for each other.
All characters belong to JKR. The Harry Potter series mentioned.