The whole premise of Ana working at Grey's house always felt a bit like an AU cheat code to me, but a useful one? It forces a constant, unavoidable proximity that the original 'will they, won't they' office dynamic didn't have. She's not just visiting his playroom; she's seeing the empty fridge, the obsessive cleanliness, the way he deals with a broken faucet. The growth I've seen hinges on that.
A lot of writers use it to flip the power imbalance on its head, but subtly. He's the billionaire, but it's his home. She witnesses his vulnerabilities in a space he controls completely, which paradoxically makes him more exposed. I read one where she found his childhood sketchbooks tucked away, full of dark, lonely drawings, and it sparked a conversation he couldn't deflect with a contract or a gift. Her growth comes from navigating that intimacy without the formal BDSM framework—she has to set boundaries as an employee and a woman living in his world, which often makes her assertiveness more grounded and less reactive than in the source material.
It strips away the glamorous dates and puts them in mundane situations, which is where real character flaws and adjustments get tested.