Solution: Suppose A Yao and A Yang have known each other since childhood (mainly cp Xue Yao, main cp A Yao). There are so many settings. Anyway, the original works don't have them. They are all privately set here.
Because ooc is for sure, and this seems to be an abusive article
So I have tried my best to maintain my character.
And because my writing is not good, I hope everyone can understand me.
Intention: abuse