Cirno is implied to be "Too strong" for an average fairy(confirmed from other stronger characters) and these 3 have a very "homey" kind of life style to them that is very different from the usual free flowing fairies. Hope to see ZUN show more oddities in other races in upcoming games.
From now on, right here...Let's pretend to be humans!That's right!Playing... humans?You know, like doing some cooking or reading a book. We can play pretend as humans by doing all those things!We can gather all those things humans use in their daily lives like the one you used just now.