Ah, thanks. Also, I'm guessing Yohane and Aoshima are friends? I've seen them reference each other's work before.
Maybe it's just because Aoshima himself is quite famous among Touhou fans, and there is even an entry about "Aoshima costume" on Niconico wiki and Pixiv wiki.
OriginalSei Style
His own style, probablyAoshima Clothing
Draws them often in skimpy clothing