Be naughty

You know full well that demoncum can have hypnotic proprieties and instead you increase the rhythm of your bewbs. Making sure that they move faster pleasuring the demoness quicker and more intense.

The succubi is clearly enjoying it and throw back her head moaning. It give you opportunity to think of a way to keep you mind intact. You are sure that whatever punishment she has in mind you will not have any free will left after it. Then again you could try and banish the succubi using the incantation circle already in place.