Amber my wife and I had been married nearly ten years when this happened. Amber was thirty five and in my opinion still a very desirable looking woman. Over the years we had been to swinging parties and done some swapping, but only ever with another couple and always in the same room. On average we had swapped about three times a year. Not what you'd call seasoned hard swingers, but not newbies either. I had often fancied going a bit wilder, but had thought that I had pushed Amber just as far as she would want to go. I was a dark cold wet February morning and I hadn't been at work long when I got a call from Amber to tell me that we had a water leak and she had called a plumber. I told her that I would get home as soon as I could but I had a meeting I had to attend. I talked her through turning the incoming water off. I had barely got off the phone when I had another caller who told me the meeting was moved back a week. I was quickly in my car and on my way home again on the forty five minute commute. On arrival the plumbers van was in the driveway and I parked in the road and entered the house. At first I couldn't see or hear anyone. Then a load moan changed all that. It had come from upstairs. I walked up the stairs wondering what I was going to find. at the top of the stairs I could see the back of a man. Then I realized that his hips were moving and pumping at something or someone. As far as I knew the only other person in the house was Amber. Then I noticed Amber's legs splayed either side of his legs. She was bent over and he was fucking my wife. As I moved closer I noticed another body laid on the bed. Amber was sucking his cock! She was sucking one man whilst another fucked her. She must have seen me, as I got closer and stopped sucking the second man's cock. "Hi honey, I have just negotiated the price of a new boiler. Ours has had it. The lads will start fitting it tomorrow," she informed me just before she went back to sucking the cock of the second man. It was far from the first time that I had seen Amber suck another man's cock or be fucked by one, but this with two men at the same time was definitely a first for me. I just stood and watched as the man fucking her finished and I saw some of his cum fall out of her pussy and onto the floor as he slipped out. The second man soon left his load in Amber's mouth. I watched as she swallowed it. I had seen her do that before but it still felt different somehow as there was two men. They soon straightened their clothes and after giving her a kiss they left saying they would see her first thing in the morning. Then they left. Amber seemed very pleased with herself saying that she had negotiated a good deal. The men had told her that changing the boiler and removing the old immersion tank shout have cost almost five grand. She had agreed that for just the trade price of the boiler and any other parts needed and a small fee for fitting they could make full use of her. I asked how much was the overall price was going to be and Amber told me that they expected the bill to be about two and a half thousand pounds, giving a discount of 50%. Then Amber joked that it was going to be fun saving that amount of money. Next morning even before I had left for work they were there bleeding pipe sand radiators and preparing to start cutting pipes. I had to leave them to it. Amber told me that withing an hour they had taken turns fucking her. Then she made them a cup of tea and had her mouth filled with two loads of cum. She said that she was fucked again by each of them later in the day. When I got home the old boiler was gone and a new one was hung on the wall but not connected yet. also the immersion tank was gone and again more pipework was needed to be done. They had managed to leave us with some water though. I asked Amber how much longer were they going to take. Amber laughed and said she hoped it would be a long time. My wife was turning into a dirty slut. Again next morning they arrived early. Amber said that I had barely left the road when she was bent across the kitchen table and was double teamed. Later she sucked them both off again, and later in the afternoon she was fucked again by both men. When I got home the boiler seemed to be connected and the pipe work in the cupboard where the immersion tank had been seemed to be completed. I asked had they finished. Amber said that they should finish some time tomorrow. The next morning they were again early, and even before I left for work the taller one, had Amber bent over the table moaning as he fucked her hard in her pussy. He took no notice of me as he pounded my wife's pussy in front of me. The other one did at least wait until I had gone to work before taking his turn. Amber told me that they had finished at two o'clock and showed her that it was all working. Then after clearing everything up they took a final time fucking and having blow jobs with Amber. Then they were gone. That night in bed Amber was like a bitch on heat waving her fanny in my face and telling me she needed my cock. We fucked like teenagers long into the night. The next day was Saturday and Amber insisted on another session before we finally got up. She presented me with the bill for the new boiler and as agreed it was for two and a half thousand pounds. Amber wanted to talk later in the day and she told me that it was not her first threesome as she had a couple of threesomes in college before I met her. She asked the next time we went to a party could we split up and could she sleep with more that one man. I was surprised as Amber wanted to go further than I had ever expected she would go. She could see my surprise and told me that she had always be curious about being with another woman and had often fantasized about being used in a gang bang. My wife was far more liberated than I ever thought she was and it was me that was now being reserved especially about her having a gang bang. It was over several years, but Amber did get to try another woman. In fact several as she thoroughly enjoyed it. As for the gang bang, she had now been in four. The first few times with three men, then four and the last time with six men. I can't grumble as it has allowed me to try a few of the things that I thought I would never get away with. but in fact Amber encouraged me to do them. The moral to our story is to talk and communicate what you like with your partner. You never know she might like it and want more herself. By the way when I went to pay the bill, the plumbers said that they would be happy to do any further deals with us. I bet they would.