Soft-Hearted (слэш)

Author's Summary:
Lan Zhan finds himself returning the smile. “Go home,” he urges gently, because it’s cold, and Wei Ying does not look like he’s dressed warmly enough to be out in the streets like this.
Wei Ying’s smile dims. “A-Ying sleeps here when it’s cold,” he tells Lan Zhan. “When it’s summer, A-Ying likes to stay by the pond!”
Lan Zhan frowns, looking at the alley around them. His stomach churns at the thought of leaving Wei Ying there. “Has Wei Ying eaten?”
(Or, the one where Wei Wuxian grows up in the Lan Sect.)