Oh, so it was Ya Qing who said it! I will be on the lookout.

RE: fic, it would be so interesting if they lived through like, an apocalyptic scenario where HPS wasn't on hand to counter Ye Zun from taking the Hallows or something... Hm.

Yeah, it sort of felt like one relationship was symbolically closing the circle of the other.
I like the way you described that! Yes, the possibility of a relationship is closed off for something else to take its place.