MR--with all due respect I have to disagree with your last paragraph. I personally have been able to rub two different girls cervix with my fingers as well as the head if my cock and each has been EXTREMELY excited when doing so. So much so they have asked for it on future engagements. Others not so much and I have to be careful. It all depends on the woman and what feels good to them.
Actually there aren't pleasure nerves inside or outside of the cervix. It would be damn near impossible to feel just a light touch. Having been the owner of a cervix that had to be checked frequently during my infertility treatment cycles to know when it was higher up and softer (a sign of impending ovulation) my fingers could feel the cervix but my cervix could barely feel the fingers.
My husband has touched my cervix many times, and unless he flips it with his finger, I'd never know it. Pounding it during sex is a different sensation all together.
I've also had chronic cervicitis for years(which still wasn't painful to me to have it touched). Painless Nabothian cysts on the exterior that I could feel and did feel often. I also had a cervical biopsy to rule out cancer at 18 years old. That biopsy punch felt entirely different than anything I've ever felt.
There aren't pleasure nerves on the cervix. She might enjoy the pressure or the idea psychologically. Studying the cervical make up will help you know this. I am not denying that lightly touching a cervix can't be interpreted as pleasurable by an individual. I'm just telling you it's not a sexually stimulated part of the reproductive system normally for these reasons.
I liked the idea of someone touching a part of me that was so bizarre inside of there and if he enjoyed it I would enjoy it that much more.
But during sex, the only time you feel your cervix getting touched is when it hurts. You don't feel it in a normal non-painful way during intercourse. It's too invasive and rough to notice it subtly being touched. It also moves out of the way during arousal for this reason.