I don't know if it's a rule at this point, but I'm dumping this at 3 harem members. I can kind of ignore the slave aspect of a story and I can kind of ignore harem stories, but man am I not reading what will now descend into 'omg he gave me regular food, I now love him for this kindness he's shown me.'
And this series was looking so good until everything needed to be fuckable...