Something Yet to Learn
Summary
“Wei Wuxian,” the man grits out, and he pauses with one hand reaching for the door handle. The disciple who had come in to speak to Lan Qiren brushes past him and exits the pavilion without a backwards glance. Wei Wuxian turns back to Master Lan, one eyebrow tilting up in question. “An urgent matter has come up,” Lan Qiren says, every word sounding like it’s being forcibly dragged from him. “His Excellency requests my presence. Their current instructor is ill, I was meant to take over classes for today,” he continues, gesturing towards the tiny juniors. He swallows heavily, and the next sentence sounds bitter. Choked. “I cannot leave them unattended.”
Wei Wuxian just blinks at him.
Or
Wei Wuxian is asked (under duress) to babysit a class of tiny Lan cultivators for just a few minutes. A few minutes turns into an hour, turns into two hours, turns into an impromptu literal field trip and now there's an entire class that is weeks ahead of their curriculum, their most junior disciples have apparently imprinted on Wei Wuxian like baby birds, and Lan Qiren has no one to blame but himself.
AO3