New Offsite Story - Utsuho and Rin's Bogus Journey · 9:26pm Sep 30th, 2013
Utsuho Reiuji comes up with the ground breaking theory that oni can achieve infinite flight ability by sitting in a box and lifting the box up, much to the opposition of Rin Kaenbyou. Through testing this theory, they release unspeakable horrors into every dimension that not even the gods can reverse.
Or just end up startling Princess Celestia during tea time.
This was requested by spartanyoshi90
The reason it is offsite rather than being on FIMfiction, despite being a pony crossover, is because A) It is more Touhou than pony and B) I plan to make this a series.
So if you're interested, the link is here: http://archiveofourown.org/works/985850