"Let me get you some water, gege."
In the bathroom, Meng Yao fills two cups of water. The one to the left is Nie Mingjue's, as it always is; the one to the right is Lan Xichen's, as it always is.
He takes out a bottle from his pocket, uncaps it, and pours it into Nie Mingjue's glass.
It took weeks to convince the void to give him the potion he wanted. It makes your thoughts brave, heroic, noble, self-sacrificing, altruistic; it makes you the sort of person who will die in order to make you save other people. It makes Nie Mingjue convenient for Lan Xichen's plans while he's alive and, well, any person can die bravely fighting off a mal. These things happen, in the Scholomance.
It took another couple of weeks to get it odorless and tasteless in water. Jiang Yanli's help was invaluable here. She's so kind. She's been making him so much of her potion that makes other potions tasteless, and she hasn't even been asking what he's doing with it.
He picks up the glasses and carries them carefully back to the reading room.
Nie Mingjue is very clearly thinking fuck off, you slimy little rat, but knowing that this would upset Xichen, he instead takes out his Strategy and Tactics For Magical Conflicts homework. "If I never have to think about the Assyrians again," he says, "it will be too soon."