@J35ang31 Oh my, we are going into the spoiler zone here with that last question. Well, I will tell you that he is VERY attached to Shiori/Bijou. Why? Because in the original novel it was stated that Momonga cares deeply for his guild members and, in my opinion on how I see his actions and thoughts, in depression due to everyone leaving. But now, Bijou exists and stays with the Yaggdrasil, including staying with Suzuki Satoru.
Now, I can't really answer you on the last question without spoiling a significant overarching plot of this fic. I'll say, however, that his plan wouldn't change even with Bijou's intervention. Yet, I can't say that the plan would be completely the same, since Ainz respects Bijou's thoughts and opinions. Even with his obliviousness to Demiurge's plans, he will put his foot down and stop the world dominion plan, but since by then it would already be too late, he'll have to make do with what has already transpired and take responsibility.