A very interesting work. I've always been deeply captivated by the moon rabbits, and Reisen 2 is a personal favorite of mine. I find it quite sweet that the Watatsuki, despite their sometimes questionable behavior towards the rabbits, seemed to genuinely care about Reisen in particular. I see their decision of allowing Reisen to have those dreams as a way to let her be happy on Earth while not having to let her go, not just because she's a moon rabbit who belongs to the Moon, but because she's also their dear pet, and after what happened with Udongein, they probably wouldn't want to lose Reisen too (pun intended).
I hope more works surrounding the Lunar Capital and the moon rabbits are done, even if the interest surrounding them is not as big in the modern Touhou community.