You've just described my wife - she usually initiates anal penetration, - likes it face down and has a noisy orgasm. I've only experienced anal with two women, and both of them initiated it. My wife says it burns a bit at first, then becomes extremely pleasureable if the guy takes his time and picks up the pace when she asks him to.
Amazing video, she is almoast like my wife after i fuck her pussy for a few monutes she grab my dick with her hand and she put it in her ass just like that with so pleasure and desire that surprise me every time she do that, after a short but hard anal sex she finish very loud and intense