Given Kaguya's similar appearance to Star Sapphire, I've wanted to see Mokou meet the fairy for a long time.
That's something I really appreciate about Touhou's diverse doujin fanbase: there are so many fun interactions to explore that you never get to see in the official works.
Hey.Hnh?Is that......Nah. Too small, I suppose.Whatcha doing over there?*JUMP!*