Gotta agree with the finger trick,
Stick your finger up her ass and let it loosen up a bit, let her get a taste of the pleasure and then slowly slide your cock in, Be attentive to her pain and take it easy on her, convince her that once she gets through the pain she's gonna come really hard, call her dirty little names while you slide it in and you're golden
If you go too fast you're gonna fuck it all up and I guarantee you'll never even come close to fuckin' her in the ass again.
And yes, it works and thanks to this method I've been banging my wife in the ass every few weeks for years :D
Oh , and don't use ANY lube at first , every bit of friction helps loosen that ass up.. any time I've lubed it up it goes in too fast and my girl screams and it's all over really fast
