I met Kaylee in the physiotherapy department in our local hospital. She was far from my normal type. At just four feet seven inches tall she was tiny against my five feet eleven inches. Like myself she was having treatment for her knees. I was getting over an operation hers was due to wear and tear. As she sat on a chair waiting to be seen she was like a little pixie sat with her legs crossed on the chair. She was called first and was taken down a corridor. As she stood I could see that she was cuddly, but not what I would consider fat. As she disappeared I was called. After thirty minutes of physio all I wanted to do was get a coffee and rest my knee, and as I was about to leave Kaylee was also leaving. I mentioned that I was gasping for a coffee. She said she was to, so I offered to get us both one. We made our way to the hospital coffee shop and I got two coffees and sat down at a table with her. As I handed her a coffee I could see down Kaylee's T shirt. There was a big valley between her breasts. I imagined my cock between them. Then I thought it was a silly thought as she was much younger than I was. I was forty two years old and I thought Kaylee was just in her twenties. I later found out she was twenty four. As we sat talking about our problems she explained that the doctors told her she must loose about two and a half stones of weight as the weight was causing her knee problems. She went on to say that between running around with two kids and a husband it was hard to loose weight. She went on to talk about going to a slimming group and that they had a sins system of what to eat and what not to eat to get slim. I sat looking at her booklet and a cookery book on the subject. The recipes looked good and I told her so. She then said that she never really learnt to cook. I offered to help her cook if she would help me with my physio exercises as I was single with nobody to help me with them. She agreed. I was on sick leave from work so time was no issue. The next day I went round her house and she had got all the ingredients for a meal for the four of them. I talked and watched as she prepared and mixed the ingredients, with very little help required. She only needed some confidence to cook. All was left to do was cook for forty five minutes. Then I looked at the section in the book on sweets. I found one that she had all the ingredients for and we prepared that as well and put it in the fridge. This was all before eleven o'clock. She then said she would go and change so we could do our physio exercises. I was stunned when she came down with a tight T shirt and some stretch slacks. We did the exercises that Kaylee was told to do. Then we got in the position with Kaylee sat on my ankles and lower legs and I did twenty sit-ups. Then she had one of my legs over her shoulder and slowly pushed up as I had been instructed. Then down again. As she did this I again had that fabulous view down her T shirt and my cock twitched and started to grow. By the time she had done the twenty moves I had a sizeable hard on. I was thinking about her legs on my shoulders instead of mine on hers. She must have seen my cock, but made nothing of it or mentioned it. Two more exercises and I was done and needed to get home and rest the knee and deal with my hard cock. The next day she had the ingredients ready and vegetables prepped already. We mixed and prepared everything else. As we worked on the ingredients she told me her husband and kids loved last nights meal and was looking forward to this evenings meal. It was soon done and ready for cooking. She had got the ingredients for another sweet and we mixed and prepared it and even did the bit of cooking required all she had to do was heat it through. Then Kaylee went off and changed again. We did Kaylee's exercises, then we started the first of my exercises and again due to those tits my cock started to swell. This time she wasn't wearing any bra under the T shirt. As she moved those tits wobbled and swung around tantalizingly. By the last exercise I had to limp out her house to my car. The next day more ingredients and soon all was prepared for the evening meal. Then down to exercises. Today she wore a very tight T shirt, much tighter than the previous one, and her slacks. By the time we were doing my exercises I was again rock hard. Then she told me it might be good for me to do one of the exercises that she had on her printout sheet and suggested that I lay flat on the floor on my back and she on my chest and held my foot that I had raised and I was supposed to try to lower it with resistance from Kaylee to stop me. The view of her plump arse on my chest was causing greater pressure on my cock. I wanted to kiss and nibble it, but managed to keep myself in check. Exercise over, instead of getting off she wriggled down and her pussy was just inches above my face. I could smell her pussy and feel my cock twitch. Then Kaylee had her hands inside my shorts and my cock was out in the open. Then even quicker she sucked it into her mouth and started sucking as her head started to bob up and down. I thought that if she could suck me , I could suck her and tried to pull the slacks down. Kaylee had to stand to enable that to happen and then we were in a full on sixty nine and sucking each other. I came first and filled her mouth and then quickly afterwards she squealed and groaned her way through her orgasm. As we redressed she joked that she wondered how many sins my cum was. The next two days was much the same, meal, exercises, sixty nine, then home. On the following Monday we prepped the meal and started the exercise. This time during the exercises Kaylee declared that it was hot and removed her T shirt. With no bra her tits looked magnificent. I groped and played with them during the exercises. Then Kaylee stood and removed her stretch tights, but instead of sitting on my face she sat on the tops of my legs and took my cock out. Then she wriggled forward and raised herself and then sat down on my cock impaling herself on it. As she rocked I played with her tits and pulled her forward. It was awkward, but I kissed and sucked her tits. She came seconds before I did. Then I panicked a little as I realized we hadn't used a condom. I told her of my worries, Kaylee informed me that she couldn't have any more children. I was relieved. Over the next two weeks we fucked every week day and some time twice. The following Monday we were both back for physiotherapy at the hospital. We were both told we had done well and Kaylee had lost almost nine pounds in just over two weeks. She was told whatever she was doing, to keep doing it. That made me laugh when she told me what was said. Later after preparing their meal we again got into our exercises before our sexercises. I had Kaylee kneel on all fours on a cushion on a chair and took her pussy from behind as I fondled her tits. Later I had my first tit wank with her. It was fantastic. Just before I left Kaylee informed me that her husband had suggested that I stay for the evening meal on Wednesday evening. On that evening I met Tim for the first time and her children. He shook my hand and thanked me for helping Kaylee learn to cook and with her exercising. Then he said whatever your doing it's working so keep doing it. I almost choked on the mouthful of food I was chewing on. He obviously meant the cooking and exercises. After the meal I helped Kaylee clear up and Tim was playing with his kids. Then he and Kaylee put them to bed. Afterwards he poured us a glass of brandy each, and we sat talking about cooking. He couldn't believe that Kaylee was eating more yet loosing weight. Then he said that he didn't want her to loose too much as he liked her a little on the cuddly side. I agreed she wouldn't look right if she became skinny. He invited me to stay again the following evening. And so for two or three evenings a week I ate with them in the evenings and shagged Kaylee during the days. The one day we were fucking each others brains out when Kaylee's best friend just walked in, neither of us had seen her. Rosalind just stood watching until we had finished fucking. "Wow that looked great," she said. Both Kaylee and I jumped. My semi hard cock was still swinging around. Rosalind was looking straight at it. Both Kaylee and I dressed quickly. Kaylee was bright red and the look on Rosalind's face told me she was enjoying herself having caught us in a compromising situation. Once dressed Kaylee made us all coffee. I had met Rosalind before and she was loud and brash. Kaylee was asking her to keep what she had seen to herself. Rosalind laughed and thrust her hand down my shorts and announced that she would only keep quiet if she could have some of my cock. Well another hand on my cock and a woman more like the type I would normally go for, I was quickly hard again. I was soon fucking Rosalind on Kaylee's sofa. After that Rosalind would come around once or twice a week and I found myself fucking the two of them on each occasion. Unfortunately they wasn't into girly actions, so it was fuck one then the other when I had recovered. The next session of Physio had me signed off as not needing any further treatment, but was told to keep up the exercises. Kaylee was told she was doing great but needed another appointment. That day after preparing the meal I fucked Kaylee extra hard as I would soon be back at work. I went the next day to see my boss to be told that they would start me back on two shifts a week slowly raising back to full time. To make things easier for me he was putting me on the night shift as the work was much less demanding. I was pleased as I would be able to continue seeing Kaylee. Later that week Tim told me they were having a Barbecue that weekend. I told him I would help Kaylee prepare the food for the Barby. Then as Kaylee was putting the kids to bed Tim turned to me and said, "Don't deny it, I know your fucking my wife." I was shocked and lost for words. "I don't mind so long as you don't think she will leave me for you. You have helped her so much. She can cook now and she has lost most of the weight she needs to loose and she seems much happier with life and the kids." The Kaylee returned to the lounge and Tim changed the subject. We never talked about it again. Over the following year or so we fucked whenever we could and sometimes with Rosalind. She eventually got caught shagging with someone else by her husband and after she got out of hospital she stopped fooling around. Kaylee got down to the weight she was told to get to. That was over six years ago and Kaylee's kids think I'm their uncle and Tim is still happy for me to see his wife. Unfortunately that had to stop due to covid. I cant wait for things to get back to normal.