"Look. Ben. I'm sure having her intermittently possess you is very annoying and you just want it over with without having to endure any further hassle. But I don't think you would want me to just teleport you to Mercury and attempt to pull her out of you there if you thought about it. I don't know what will happen if I do that. For all I know, you will die as soon as I do it because of some kind of dependence between you and then I have to go haul you back which could take me a while, or she'll triple in power and be strong enough to give me a difficult afternoon once you aren't attached to her, or she'll go terrorize her original subworld and then I have a difficult rebellion project on my hands, or something. Some of those outcomes are not great for you."