How we got started

We didn't really have a discussion. I had been married about 17 years before I discovered my wife was having an affair which apparently started about 5 years into our marriage.
Proverbially I was last to know.
After arriving back home a few days earlier than planned from an overseas work related trip I came home and found my wife not there. I telephoned her work and the 2ic there said she had left for home. So I said I have just got there and nobody there. Her casual reply was "ok she must be at Louis place in Kalamunda".
At first it didn't register then I realised the only Louis we know lived in Kalamunda was family friend.
So off I went to Kalamunda and long story short caught her in bed with Louis.
She was in her back legs over his shoulders being pounded by him... When she turned her head and saw me in the Doorway, she tried tapping him on his shoulders but I think he thought she was enjoying it and urging him on... So he upped the tempo and she orgasmed...He didn't let up job at carried on stroking. At that point she was powerless to stop him. Just had an expression of lust joy on her face... Her body sold her out completely because she was responding to his every stroke arching her hips up to meet his strokes. Her hips developed a mind of their own.Every muscle in her body was straining.. The veins on her forehead and her neck were swollen...she orgasmed second time in my presence.
Then I walked out and sat in the car in turmoil. After some time not realising a half hour had passed I went back in to find them at it again this time her body was shaking quivering in exctasy and she was babbling incoherently. I knew then that it what I wanted for her and what she needed herself. That's only time I have seen them having sex but 20 years later he has become an integral part of our lives.
 
My wife was a virgin and I was totally straight when we first started dating at age 19. She became very adventurous several years later and I was glad to go along with it. She first just wanted to suck off another guy and after that she wanted to try being with another girl. She met a couple that the wife also wanted to be with another girl so they got together several times while us husbands watched them and then the wives would suck us off. The one night while the wife was sucking me off and my wife sucking the husband, the husband asked if he could fuck her and without even looking at me to see if it was okay she immediately said yes and he began fucking her while the wife and I just stopped to watch them
 
My wife really loved to be fucked by that husband and she wanted to experience more guys after that and she would ask me to help her suck off guys but at first I refused but one night I finally gave it a shot and I had to admit how turned on we both were doing it together. After that we made it a regular routine for both of us to suck guys off