I'm planning to write a separate note on Yue and its characters sometime in the future. For now treat yourself to this story below, which explains how Fai met his special one.
Original!Fai, Yuui and Kokuyo belong to Clamp.
Yue!Fai and Yuui belong to slow-worm.
Yue!Kokuyo belongs to A.
Story by slow-worm and A. Written and translated by slow-worm.