OK, so I have a question

In the past, when I'm railing a chick, I just pull out last second and bust on their face without permission. 90% of the time they like it, sometimes they're kinda like "really?"

Anyways, now I recently started banging a new girl.... and she's ultra conservative, stubborn, and can bit a little uhhh, aggressive? Not very passive

I'm genuinely intimidated. I wanna bust on her face, but i feel like if I just do it without permission like I usually do she will freak the fuck out. And I don't want that

So my question is do I ask her? Do I tell her right before I do? Do I just do it like I have been? Or do i just not even try?

thanks