Will the succubus be bound, what will he do with her?

He is able to ignore her trick

He had done his research. Knowing that the demoness would do anything to make him forget the procedures that had to be followed, he flipped quickly to the banishment page and recited the lines found there. With that finished he knew that he only had to speak the one final word and she would be sent back to the land of where she originated.

"Now," he said facing her, "you're truly mine. I will drop the circle and release you, but know, I need only say the final word, at any time, and you will return to the netherworld."

"Thank you, fine master," she grinned villainously, "I will do anything you command."