Kat and I had been married for 12 years and had always had a great sex life. We had recently joined a swinging website and had already had a few hot sessions with other couples, though we were keen to have either another man or woman alone with us, as opposed to a couple. One of my fantasies was for Kat to dominate me and make me watch her with another guy and then get me to clean his cum from her pussy; unfortunately we just could not find anyone suitable on the website.
Two weeks ago an old friend of mine, Mike, contacted me and said he would be working in the area; innocently enough I invited him to ours for the weekend, which he accepted. It was only when I told Kat later that day that she mentioned the possibility of Mike helping to make our fantasy come true. I was fairly certain Mike wasn't bisexual but Kat and Mike had always flirted with each other in the past and I thought he would at least be up for it with her. Mike arrived on the Friday while I was still at work and he and Kat sat in the garden drinking all afternoon. Kat later told me that she had been extra flirty with him and that he seemed up for it with her. When Mike had gone into the kitchen to get a refill, Kat had followed him and came onto him; initially Mike was reluctant because of me but Kat went on to tell him that I knew what she was up to and had agreed. Mike was still wary and to reassure him, Kat sent me a text message asking if she still had permission to fuck Mike; I replied yes straightaway and when Mike saw my reply he could barely restrain himself and minutes later Kat and him were on the sofa, kissing and groping at each other.