Disclaimer: I am no expert when it comes to succubi. I have had one with me for a few years while she was passive getting to know me. I have accepted her presence and welcome her into my life six months ago so I thought I should share my experience.
There is a reason why we feel our succubi strong at first at as the relationship progress and there presence may become weaker. The answer is simple. They love us for who we are. They chosen to be with us for that reason. That means if we try too hard to communicate with them we lose a bit of our selves trying to please them. Continue to be your self and accept them for who they are as an individual and they will set the pace of the relationship they have with you.