That time my wife sucked my friend

Let me share with you the one time my wife sucked my best friend.
My Wife (34F) and i (34M) already had a cuckold experience with a friend but I was always in the same room, experiencing everything up close and participating as a trio.
My best friend (34M) didn’t know that we were into this lifestyle but already made some comments about my wife’s huge breasts and we noticed in the past he was staring at her cleavage..
Some days ago, out of nowhere, he sent her a message saying that he would be delighted to eat her pussy and see her cum,nothing else. We talked about it and we were both thrilled with the idea!
The “problem” was that he wanted to do it alone with her, and i had to stand outside while they do it.. I felt a little dizzy with the idea but decided to go ahead with it.
We met at his apartment and she was absolutely gorgeous with stockings, a laced body and a “easy to undress” dress so my friend could have no trouble finding her pussy and going ahead with his promise.
As soon as we reached his house I asked for a bottle of wine and, while I was expecting some small talk, he just said to me while getting close to my wife “We have some things to discuss in the bedroom, you will stay here and make yourself comfortable”… I grasped in shock with the idea of this really happening with me not participating or even seeing it.
In that moment I really thought I was going to faint or something like that.. it was almost unbearable but I managed to stay calm while they entered the bedroom and he closed the door (in my head it was like a castle door with 2 tons closing and separating me from what was about to happen), I grabbed a chair and sipped my wine while I heard him undressing her, commenting how gorgeous her breasts were and ordering her to stay on all fours in his bed. Most of the conversation I wasn’t able to hear but I could perfectly distinguish her moaning when he started licking/fingering her and a distint spank on her ass (I know how she loves both), and then hit on her ass, and more moaning from her and, finally, what I knew that was a orgasm from her…