Why She Gotta Tease
We call that a cock tease. Sometimes its just the hunt...
Maybe she's just looking for your limits and trying to see how far she has to go to get you aggressive instead of whiny. Have you tried being forceful when she starts something like that? Grabbed her hair or head and shoved your cock in her mouth, refusing to be played and denied?
I've often wondered how I'd react if that happened to me, I'm a gentle person, but I have a really darkside that I don't like surfacing so if something like this were to happen, I hope I wouldn't overreact.
Maybe she wants you to force yourself into her, just create a safe word if you guys don't have one, and make sure to fully understand that at any point any of the 2 can use it. That way next time use that anger to fuck her like a slut, if she dowsnt use the safe word, that what she wants. If she use the safe word, then ask her what is that she wants?