Appeal to her better intentions

"Look... Denaria? I didn't ask for the demon to take over my body, and I want him gone. Is there any way you can get him his own body?" Fury clouds your vision red for a moment, the demon clearly unhappy, but it recedes as you altar your request to include getting him a new body. "He seems to be on board with that idea as well, if you have any suggestions."

The blue succubus seems to consider your request at length, but after a few seconds she merely turns back to you and shakes her head. "I have no idea how that would be possible, dear. You're holding a thousand-year-old demon, bound by a hundred-year-old curse. There's no way to get him a new body in this world, and while I have a few... experiments... on hand, none of them have the amount of sanity required to serve as a host."

"What about you?" The words are out of your mouth before you realize what you're saying, and a foreign emotion flashes across the woman's face, causing you to instinctively flinch. This causes a large amount of amusement in the demon, and for the first time you hear his laugh, a deep and rolling noise.

"Look, dear, as much as I've enjoyed having Gil inside me in the past, I've got a new life now." She layers the innuendo herself, practically causing you to groan. "Though, you bring up a good point. If you can find another sane and intelligent being, we could likely transfer his consciousness from your body to theirs."