If Yui or Akari finds out that would be a HUUUGE development
I think Yui knows. I don't remember if there's any thing like that in the manga but in the anime it is heavily implied that she knows what's up. Especially in S1E10.
Akari is too naive. Remember, she didn't understand Chinatsu's feelings for Yui even when she said that she wants to kiss Yui? She will probably think Ayano wants to be Kyoko's close friend lmao