So, does this mean that she's never had an O? Or are you (or she) not sure? So, you're doing oral on her, she gets a certain point, she stops you, then what? Do you proceed to IC? Does she keep going toward O or does it just drop off for her, you O, and then you're done?
She's usually asking for IC as soon as she starts to get warmed up, but IC generally will not get her going as good.
She wants to go right to IC before she's sufficiently warmed up enough to O? And then the IC isn't enough stimulation to maintain her arousal?
I'm not sure if pg comes into it, in fact I think I am more worried about it than she is: the only time of the month she has any interest in sex is the day or so around when she is fertile, and in that case it is me saying no, we can't have IC then.
She has interest when she is fertile because of hormones. I experience the same thing. Even before I started examining my own issues, I realized that I was always up for sex during my fertile time, regardless of what was going on in our R. Whatever issues I had at other times of the month that may have prevented me from initiating/having sex just don't exist during that fertile time.
Do you give her oral during her fertile time? Could you both just "do" each other with no IC? I would think that this would be the best time for her to explore her fears about Oing, as her inhibitions would be at their lowest point.