This started when I had just turned 49 years old. My sons had both left home and my wife had died the year before. The one son bought the house four doors down from mine and lived on his own. Then he got a new girlfriend. I didn't like her very much, no specific reason, I just thought he could have done much better for himself. They would visit quite often and would just enter from the back garden. She was steadily worming her way into his and now my life. I had semi-retired and did consultancy work from home. It payed even better than when I was in full time work. The day started normally and I was in my office and had the TV on as I worked. Something caught my eye on the TV with a naked woman. Although the piece on TV didn't last long it caused my cock to swell. I parked the work I was on and put a CD of porn in the player and sat back at my desk and pressed play. The screen was filled with a busty blond sucking a large cock whilst being fucked from behind by an equally large cock. I unzipped and pulled my cock out and was seeing to myself, when Wendy walked in and caught me watching the film. "Who's being a bad boy," she said teasingly. At this point she hadn't seen that I was wanking myself, but as she continued into the room she suddenly saw my cock in hand. "Bloody hell, you dirty bugger," she said as she got closer. Instead of leaving me to it she turned my swivel chair and dropped to her knees. "Ill help you with that," referring to my seven inches of flesh. I thought she was going to wank me, but no her mouth sucked me straight into it's opening. Here was my son's girlfriend, that I didn't particularly like, giving me a blowjob. She was obviously no stranger to a bit of cock sucking, although she was struggling with my girth as I am blessed with a fairly thick cock. That didn't deter her as she tried to swallow all of it gagging several times. then without warning she stood bent at the waste, never letting my cock leave her throat. She pulled what turned out to be a thong to one side, turned and sat straight down on my cock. Now she is riding my cock. Between her groans and those from the woman on the TV my cock felt like it could explode any second. I warned her that I was about to cum and she seemed to ride harder instead of getting off as I thought she would. Too late anyway as my seed flooded her fanny. She stood up and some spunk dropped from her fanny into my lap. She readjusted her thong and saying she would make us a cup of tea, left for the kitchen. I made my way to the bathroom and cleaned myself and my pants up and returned to the office and turned the TV off. She returned with the tea and sat on the other chair in the office talking about anything except about what had just happened. Having drunk her tea she just suddenly said, "Must go, got things to do before David gets home." Then she was gone. That was my first fuck since my wife had died. I thought that it was a once off. It wasn't, Wendy would just turn up almost anytime during the day, as she didn't work and either suck me off or more often than not, she would fuck me and then just leave. She was a real slut and my son had recently told me that he was going to marry her. I had a mate who had divorced his wife. When my wife was alive we swung on lots of occasions with them. I told him about Wendy and he told me that he was not getting any and he wouldn't mind a 22 year old dropping in and wanking, sucking or fucking him. That gave me a thought. I told him that it was my birthday the following Friday and to come over to me for the day. Later that day Wendy dropped by and give me a blowjob and just before she left I said that I hoped that I would get more than a blowjob the following Friday as it was my birthday. Afterwards, as usual she said she had other things to do and left. On the Friday morning Gus turned up and he sat with me in the office with the TV on and the volume turned off. I had prepared him with what he was to do. The porn film was a little boring with some slag trying to get a huge black dildo fully into her fanny. I heard Wendy open and shut the back door. I told Gus to slip into my bedroom next door. He did and waited for a signal from me. She entered the office in just her shoes. As usual she had my cock out and was sucking as much as she could into her mouth and throat, wile stood bent at the waist. This was the position she would adopt if she was going to fuck me. I pressed the volume button on the TV remote and the volume came on fairly loud. This was Gus's signal . He came into the room with his cock poking straight out from his boxers. He lined up with her fanny and with one hard thrust he was buried deep in Wendy's fanny. She squealed and let my cock fall from her mouth to turn and see Gus now pounding her from behind. I just laughed at her getting railed by a second older man. She didn't seem perturbed at her situation, far from it she was now pushing back to meet his thrusts and resumed sucking my cock. Gus has a longer cock than mine, but not quite as thick. He must have been hitting all the right places and she was groaning with every thrust and then she was shaking from head to toe as Gus pumped his cream into her. Wendy just stood there and before she had a chance to do or say anything I took Gus's place and thrust deep into her sloppy wet fanny. She just groaned as I started to hammer into her. Gus was now sat on my chair feeding his wet limp cock into her mouth. Over the next two hours she sucked and fucked both of our cocks many times in many positions on my bed. Then as usual she said that she had to fly, although before she left, she did tell Gus and I that we were a pair of dirty old fuckers. We both told her that she was a dirty slut that loves cock. She continued to suck and fuck me about three times a week and sometimes I would invite Gus over. Then about six months later the big day of the wedding was arriving. My lad was going out on a big stag night with lots of mates on the Friday night. As Wendy now lived with my son, she asked if she could stay at mine the night before and have the hairdresser, bridesmaids and all the normal pantomime that goes with it at my house as her parents lived two counties over from us and they would arrive just before the wedding. She wanted to stick with tradition of not seeing David until the wedding morning and arriving at the church. I agreed and asked about a hen do. She told me that she wasn't having one on the Friday but two days prior so she was not feeling bad on her wedding day. She arrived at mine about seven p.m. with two large suit cases and dumped them in my spare room. I was watching TV and she came and snuggled up to me as I was watching a film. I watched a little of the news at 10 o'clock. Wendy was asleep with her head in my lap. I woke her and suggested it was time for bed. She went straight up stairs while I went to the kitchen and took my nightly medication with a drink and then locked up and went upstairs to find her in my bed totally naked. Was this a new tradition I wondered. We sucked and fucked each other until we fell asleep. Next morning the wedding pantomime started and went off without a hitch as did the wedding. The reception was over and Wendy saw her parents into a taxi to their hotel. My son went to his house to change and put some stuff into his car ready to leave on their honeymoon. Wendy came to mine to change and collect her suit case. We had barely got through the door when Wendy stripped naked in the lounge I expected her to go to the spare room and change for the journey, but instead she was all over me and we screwed in the lounge with her draped over the sofa. It was quick and dirty. Then she went and changed and came down with the case she was taking on the honeymoon. Just then David arrived and took the case out to his car. While David was outside Wendy kissed me and said, "See you two in two weeks time," as she stroked my cock. Perhaps another new tradition. Why not invite me on the honeymoon I thought. Well two weeks later on their return, I fucked her married fanny for the second time. They now have three children and Wendy still calls round some mornings and looks after me and very occasionally Gus. I'm sure my son has no idea whet a slut he married. Well I wont be telling him.