Holiday Secret

Many summers ago my wife decided we should go to Spain for a well deserved holiday, as we discussed the trip her sister declared that she would love to go as well, we both agreed as we all got on very well. When booking the location we could only find a one bedroom apartment, but it did have sleeping potential in the living area, and so it was booked on the basis that my we would have the bedroom and my sister-in-law would sleep in the living area.

My wife and I had been together since we were young and we enjoyed a lovely sex life, she was tall with large breasts and full hips that beautifully framed her delicious well manicured pussy, my sister-in-law was the opposite. She was short and thin with small breasts and when she wore tight jeans you could often make out the the gentle indentation of her sex, which she clearly enjoyed showing off, she was in so many ways very attractive to look at. Over the years she would often kiss me goodnight if she stayed over, and once or twice she would walk through the house with very little on, in recent times our conversations were becoming more and more suggestive and we were very comfortable in each others company. Just prior to setting off on holiday we had a quite drunken evening at home and all three of us were discussing the trip, when my wife went bed early the conversation with my sister-in-law came round to sex, and more precisely her lack of it. She said how lucky I was to have to her sister to sleep with every night and she let slip that some of my bedroom secrets were known to her, she knew how I liked mutual masturbation as well as sex. As she went on about what she knew I could feel my cock swell and I held my breath as to what she would say next, without skipping a beat she told me that she masturbated nearly every day, but really missed having sex. After she said this she backed off as she felt she had said to much, she quickly said goodnight and went to bed, I just sat there mesmerised by her words but with the hardest cock I'd ever known, I masturbated and came right there and then to the thought of her playing with herself.

Although we did not discuss that night before we went on holidays, I could sense a certain tension between us and hoped it hadn't spoiled our great rapport. After the first night in the apartment everything was relaxed and we all settled in for a nice break, as it was very hot I was always in my shorts and T-shirt and the girls did likewise. On the second night my wife and I went to bed early and had some wonderful sex, but as the door was thin we knew that my sister-in-law could hear everything, sure enough the next morning she smiled at both of us and said how lucky we both were. 

After a few more hotter days we were now walking around the apartment with very little on indeed, my wife was often topless with skimpy pants on and I was down to some tight underwear whilst my sister-in-law was wearing a bikini, when I looked at her I couldn't help seeing that her bottoms were often reaching up inside her. On the last night of the trip my wife went to bed and left me sitting reading a book in the living area whilst her sister got herself ready to go to sleep. As so often was the case she lay down on the sofa bed and put a thin sheet over her body, then she would take off her bikini and sleep naked. I had watched this ritual every night and I knew she was putting on a little show for me, but tonight it was a little slower and at times I could see a little side boob and ass cheek as she got comfortable, after saying good night to me she turned off the side light and turned over. Sitting there with only a small nightlight I pretended to read my book, by now I had an erection which was poking out of my underwear, early that day my wife had commented that she could clearly see my cock through the thin fabric and that I really should put on shorts when her sister was around, but I was putting on a show too.

About ten minutes later I knew my sister-in-law was asleep so I gently teased my rampant cock out and began to slowly stroke it, I had to be quiet as my wife was in the bedroom and the door was open, plus I didn't want my sister-in-law to wake up and catch me. As I stroked my cock I could see a little movement from the sofa, the sheet covering my sister-in-law moved slightly and I could clearly see her ass, as she still faced away from me I just felt it was pure luck on my part. By now I was totally naked and stroking my cock hard, my hand was rubbing my balls gently and I knew I would cum soon. As I looked back over at the sofa I couldn't believe my eyes, I could see her fingertips poking out from between her ass cheeks, she was rubbing her pussy but still facing the other way. I could now hear her breathing was getting heavier, she was masturbating knowing that I was behind her doing the same thing. Within minutes we were both reaching our climax, her breath was rapid and her hand was moving so quickly, my hand was pumping my cock hard and I reached for my T-shirt as I was going to cum. Suddenly I could see her ass cheeks tighten and she gulped a number of deep breaths, she was as quiet as she could be when she came, at that same moment streams of cum shot out of my cock and into the rolled up T-shirt, I was as quiet as I could be too, but I knew she heard me clearly. I cleaned myself up with the T-shirt and looked over in time to see that the sheet was now back covering her body, I turned off the light and sat there for some time trembling from pure pleasure.

We never spoke about this time on our trip and it was never repeated, but it has lived with me ever since and many, many times I have masturbated to its memory.