MFM with my wife

We had never even discussed a 3some, before we married or after but 2 years in we were butt naked in our den with my friend who was divorced. This was Friday night, they fucked all weekend. It started as he asked to see her tits, she had a boob job a year prior. Even though we were drinking and I also chided her to show him I never thought she would. I could see her confidence and her interest growing as her pleaded with her. In a few minutes her top was off and she was letting him feel them. Then he sucked on them for a minute and she took his face in her hands and brought his face to hers and began kissing him deeply. As they broke away she just says “ I want to see your dick.” He stands and is looking at me as he starts to undo his Levi’s. I never said anything, she told me to get my pants off too. As he pulls his boxers down and it flops out half hard she just says “omg, yours is so much bigger than and her words trailed off as I stood there with my little hard on.
I will just say she took full advantage of the opportunity, she did whisper stuff to me asking if we were going to do this and all I remember was asking her “do you want him?” Her words were something like “oh god yes, it’s so much bigger.”
I did participate somewhat but I ejaculated three times that weekend and he must have cum ten times and she had more orgasms than I had ever seen. She had an orgasm 30 seconds or so once he first penetrated her with a little more than half of his eight and a half thick inches. That first encounter he was inside her maybe 7 to 8 minutes and she had three huge orgasms, all on his dick. It was erotic and humbling at the same time. Why is it that women in this situation seem to look directly at their SO when they start cumming? So one minute in and she’s cum already, now he has the entire thing in her and she is focused on him and hammering back on him, taking him balls deep and making noises I’ve never heard her make. I was near tears as I watched and listened, my dick was as hard as it has ever been and precum is stringing down. She cums again staring into his eyes and again as it climaxes she looks into my eyes. If I had touched my dick I would have cum instantly. She starts going off again and he says he is going to cum. All she said was “don’t stop, don’t stop. He cums in her and after a few minutes she allows him to pull out which caused a huge shudder for her. He has gone to clean up and I want mine now, she wants to wait till she cleans up but I can’t wait. I pretty much came as soon as I penetrated her which was frightening, I knew she could hardly feel me. She kept telling me how wonderful I felt inside her which was embarrassing to me.
That was my most erotic moment in over 60 years of life. Probably hers too.