Shirley and I had been married for about a year when it first happened. I was in the Army in Germany and we were living in Army quarters. I was on duty and not due home until after midnight but I caught a break and finished early, so at 8pm I pulled up outside our house and noticed a car belonging to an officer in mu unit parked outside and our bedroom lights on. I crept to the window and through a small gap in the curtains I saw my wife and the officer (Captain Simon Jones)(name changed) having sex in our bed.
I went back and sat in my car and about half an hour later Simon came out of my house and drove off. I immediately went into the house and Shirley was still in bed so I went in and explained that I had got off early and I stripped off and got into bed with her. I put my arms around her and kissed her, she seemed a little nervous but said nothing so I started some foreplay and kissing and fondling for a while. then I started to kiss her tits and nipples then down her belly soon arriving at her pussy, I noticed that it was very wet and sticky so I kissed her pussy lips then slid my tongue inside.

I could taste Simons cum in her pussy but I kept licking and making MMMM noises, I said "you taste so good tonight Shirley" and she smiled at me nervously. I carried on licking for a while then put my cock inside and started to fuck her slowly whilst kissing her deeply. As I was fucking her I said " I noticed Simon leaving just as I pulled up, did you enjoy yourself with him?" She went stiff and stuttered " Oh Alan, I don't.... " I kissed her again to stop her from talking and started fucking her harder. I was so turned on that I shot my cum within seconds.

When we had got our breath back Shirley started to apologise. I stopped her and said that it was OK, I really don't mind, I know that my cock is small and sometimes you want something bigger. Simon visited quite a lot after that and we became friends. They would sometimes fuck while I was in the corner watching them.

My career took off while Simon was my platoon commander I was promoted regularly and hardly ever did guard duties. Simon got posted a few years later but there have been many others over the years, but more of that in further posts.