Each mistress must own one of the three possible items in each area. Once you acquire the Fay friend trophy, simple go back to the customization alcove where you previously purchased all the items and select the ones listed below.
Juno Rugs & Curtains
Juno Lion Alcoves
Kelda Wolf Rider Statue
Banners have to be Overlord!!
credit goes to DaMSWer from the TA website for the combo that works.