My Deviant Wife

My wife of 15 years looks pretty good for being 38, but her lifelong friend Anna is a bombshell. She is one of those women that even as they age they are still stunning. Anna is about 5'5", long fit legs, tight ass, slim waist, big tits, big beautiful smile, great hair, just pure sexual fantasy.
My wife knows that Anna is the one that gets all the looks and she isn't bothered by it. I really think my wife is into her too. The reason being she has on multiple occasions brought her up in intimate situations. One time, as an example, she asked if I liked Anna's cleavage and if I'd like to titty fuck her, then when I got hard she sucked me off.
That was about how it has always been until yesterday after a day of clothes shopping with Anna. Shortly after she got home she called me into the bedroom. When I walked in she was already completely naked, so I quickly stripped and got in bed with her. After just a few seconds of foreplay she reached over me to grab her phone, then handed to me told me to watch while she fucked me. She had a roughly 10 minute video of Anna trying on clothes in the changing room, often topless, once bottomless. Throughout the video she was joking with my wife, shaking her tits at the camera and showing off her ass by bending over in her little white thong right in front of the camera while my wife squeezed her butt. The entire time my wife was riding me she was sying, "Do you want to fuck her, you want to eat her pussy don't you, you want to cum deep inside her and let me lick it out of her" among other things.
Like I said before, my wife has always been into Anna talk when we play around, but this was something else. I hope it continues to escalate like this!