First time swinging

When we were much younger my wife and I used to party with my best friend from high school. One night after drinking we decided to crash in his living room instead of driving home. We were laying on the floor, not sure what came over me but I reached over and took his hand and put it on my wife's big hits. He was confused but definitely enthusiastic! They started making out which turned me on to no end. I should say that he was a real GQ type, 6'4" and very good looking. My wife happened to be on her period at the time and made a point of asking why we didn't start this a week earlier. She wound up giving him a blow job while I watched. He told her "here it cums baby!" And blew a big load in her mouth. She looked at me and I leaned forward and kissed her deeply, tasting his cum in her mouth. We wound up fooling around with him off and on until we moved across the country but I still jerk off thinking about those fun times.