By the way, this manhwa reminds me a lot of the movie "The Handmaiden" or "Agassi".
It's a Korean movie, it's an erotic thriller and I highly recommend it.
Ifrit is either much too use to her parent's blatant flirting or blissfully unaware or maybe the food is just that good that she doesn't give a damn about anything else.
Poor Mayer tho, I've been there before :,)