Blood transfusion.I want to have vaginal sex with Nell in her sleep, but belle said that because she has Fey blood, it won't work. How do I get around it?
Seriously though, you don't. That option just isn't available. I realized when I was developing that scene that, because of the rules for magic and non-human beings I had established in the story, it would make perfect sense for this kind of magic not to work on Nell. Besides, it was already the biggest update I've ever done, so if I was going to cut anything to get the update done, that was it. You really have no idea how much time and effort went into building these ridiculously complicated scenes, particularly when there are two characters present who may be in different positions and even state of pubic hair based on things you have done before. It's a nightmare to deal with.
In short, you'll have to live without going all the way with Nell at night.