Got to say, I don't like the development with that girl, I would find it annoying and its getting to the point of rather not read this. Either go harem keep it simple, or give one FL. Her behavior is just causing that dynamic to be the center of the story. Not to mention, realistically, she either accepts it, gets with it or it will NEVER work, not without plot armor which in that case may as well us plot armor to make it work well. Otherwise, realize it won't work long term, and cut ties, better for her, better for the MC, better for the readers. Let's be real, so far this entire story has been OC, little to none of the canon plot (so far), it still feels like we are getting to know he MC, no adventures to speak off, no story (killed one angel for a power boost... yay) and we already getting into day to day drama. This is like chapter 200 material where the MC establishes himself.