Can the お　prefix indicate an ON or KUN reading? I was practising translating a fairy tale from Japanese into English when the following sentence came up: ...珊瑚と真珠でおおわれた人魚のお城がありました。 Normally when a kanji stands alone it's usually the Kun reading. However i was in doubt about the お城. Can the お cause a On reading? お城 = おしろ　対　お城= おじょう Thanks!