This has come to my mind and maybe that'd be a cool part of your kink too. If I were to move in somewhere with an SO, I'd look into dedicating a "secret room" to her, where she can do any sorts of business without me seeing. That'd be a locked room only her can ever enter or see into. For smaller needs that could as well be a drawer, but the mental thing about an entire room being out of reach is huge from so many standpoints.
Which kind of things could go or be done into this room? Storage space for a diary? Extra cages?
Is there anywhere in your house you gentlemen don't have access to?