I recently had to stay the night at a friend's house. We'd been working late and he insisted that I shouldn't think of even attempting the hour-long journey back home, knackered as we both were. He said his wife would agree that I should sleep in their spare room. He had an early start, and he said that he'd be gone before I was awake the following day and that he'd see me later at the office. I called my wife and explained what was happening. I think she had been out with one of her friends, and had quite possibly been on the pull because when we spoke her voice was slightly slurred - obviously the worse for drink - and I thought I could hear at least one man's voice. I didn't comment on it however and after the call, went to bed in my friend's spare room and was asleep as soon as my head hit the pillow. The following morning I woke with a massive hard on. Not entirely unusual, but this one was not going to fade away quickly. I checked the time. About an hour later than I would normally be! but I had no reason to rush, so I lay there contemplating whether to seize the moment, as it were, and stroke away. I was about to do just that, when there was a knock at the bedroom door and my friend's wife came in, apologising for disturbing me, with a cup of tea that she place carefully on the bedside table. She is a very attractive woman. By no means a beauty queen, but with big green eyes, a gorgeous smile, shapely though slightly skinny legs and big tits. She was still wearing her pj's - quite tight fitting bottoms and a fairly deep, plunging v-neck showing her assets beautifully. Having put the tea down, her eyes seem to laser in on the tent I'd formed in her duvet and her light, chatty conversation faded away. After what seemed like an age, but was probably only a few seconds, she cleared her throat and said "I hope you've been comfortable". "Yes, thank you", I replied. "It's just that you don't look too comfortable now," she replied. "Is there anything I can do to help?" She blushed slightly as she spoke, but there was no hesitation in her voice now. "Well," I said, hoping not to sound like a complete idiot, "I wouldn't want you to go to any trouble." "No trouble", she replied. "May I take a look?" I couldn't answer. I just nodded. She pulled back the duvet to reveal the pole pushing my pj bottoms right into the air. She reached over and lifted the elastic top of my pj's over my erection revealing my cock in all its hardest glory. In what seemed like one movement she knelt on the edge of the bed and swiftly placed her lips over my bulbous bell end. She sucked it in and out of her mouth, whilst wanking it with her hand at the same time. I could feel my load beginning to gather strength as she sucked, liked and caressed my cock with her very active tongue. After a minute or two, she lifted her mouth of it, stood up by the side of the bed and stripped. Not a word was exchanged between us as she climbed on top of me and lowered herself on to my still rock hard cock. I knew I wouldn't be able to last long now, and sure enough as she effectively wanted me with her cunt walls I rapidly reached the point of no return. To give her the chance to avoid me cumming inside her, I manage to blurt out "I'm going to cum!" but she just smiled, tossed back her head and. If anything rode me even faster. I came with a rush, filling her with a huge mass of creamy, hot spunk and she appeared to cum at more or less the same time, leaning back as she bucked her body against me and yelling loudly as my load shot deep inside her. We lay side by side, exhausted by the exercise, until she leaned over me and whispered "you must never tell him, although he wouldn't mind. We often spend holidays at swinger's hotels." I raise my eyebrows, and she just smiled, before continuing, "but there's no reason to put your working relationship at any risk, but I want you to come here again - literally. Let's make it soon." With that, she kissed me gently and went for a shower,. Later, my working day seemed to fly by.