No problem, sorry I skipped over Bree's submissiveness not increasing, I forgot to mention that. But I edited the post, the wiki is a huge help for forming all harems, but the bottom line is usually just avoid sleeping with people in the same harem within a week until their stats are high enough.
Also, I feel like I should mention this, if you want to aim for getting as many characters as possible, you should probably make Emma a priority.
Compared to other characters she is a bit of a pain to get her to stay.