Personally speaking the writing here is phenomenal and i feel like the people who are complaining are missing out either by not reading and understanding the very subtle points being shown to them.
It's really not though, because the characters aren't at all beleivable. I really want to like this game - the renders are really well done and the characters are hot (well, apart from Heather). And I like domination in games. I even like forced sissification in games. But the extreme lack of agency, the utter stupidity of the MC, and the entire ridiculous premise spoil it for me.
For example, any rational male in the dinner table scene when Elizabeth is rubbing him with her foot, would just have reached down and threatened to break her little toe. She couldn't do anything about it without revealing herself. But instead, he just allows this stuff to happen. He has no agency. This happens again and again - there are no scenes at all that are handled rationally or believably.
Perhaps if the story were better thought out, it could be explained. Starless actually did this better - the MC really couldn't leave - but in ED they really don't need to put up with this. The author should have given them a more compelling reason why they have to stay and why they have to obey. Maybe make it an alternative universe with a facist state, or an ultra capitalist society with financially triggered slavery. Or maybe give them some secret which needs to be kept so badly that they allow themselves to be abused. Or maybe the Sterns have something that they really really need, like a cure for a terminal disease that Heather has. There are lots of ways this could have been handled, but the author went for none of them.
(On a side note, it would also be better if they were actually treated like servants. No upper-class family would allow servants to dine with them. I actually grew up in a house with live-in servants, and evrything was very formal. They kept to their own wing of the house unless they were on duty, had their own entrance, and first names were never used. They also didn't chat or give their opinions - they would just reply with "Yes, Ma'am" or "No, Ma'am" or simple factual answers.)