So over the last few years i've gained a bit of weight which is starting to affect my sex life with my wife Sarah. She is forever encouraging me to eat healthy and exercise more to try and shed a few pounds.

One Sunday Sarah and I were discussing strategies for me to lose weight and I told her how about she give me a sexual reward for every kg I was able to lose. You know like a steamy night where I get her to do what ever I want to her! She smiled at me and said that sounds like a great idea but it doesn't sound very fair so she proposed her own twist. When ever I gain a kg she would have sex with another man and I had to watch.

I'd been on a downward trend for a couple of months now so I agreed to this deal because I rarely get to have my way with her these days and I had a few fantasies i'd like to play out with her.

The Rules: Weigh in once a week on a Sunday, I wasn't allowed to check my weight throughout the week to keep me disciplined, Sarah even hid the scales from me and took them to her work everyday to ensure I stuck to the rules.

All was going well for the first 6 months, i'd lost 10kg's and our sex life was going great, Sarah had an upcoming trip to the south island for work and she was going to be taking additional time off to spend with her family in Cromwell while she was down there. While Sarah was down south I got lazy and ordered out almost every night. Over the last two months Sarah hadn't been super strict about checking my weight every week and I only reminded her when it felt like I had lost some.

Sarah came home on Sunday, she passed by the recycling and lifted the bin lid on her way into the house. Before greeting me she made a comment about all of the pizza boxes in the recycling and she seemed a bit pissed about it. I barely got two words out of mouth before she barked at me to get on the scales, I climbed onto the scales to reveal that i'd put on 2kg in the 2 1/2 weeks she'd been away. She looked at me disappointed and stormed off.

Wednesday came around and we went to bed early, this is usually when we have sex during the week, Sarah was being dominant today and bought a chair into the room, told me to strip off and sit on it. I obliged and she started to handcuff my legs to the chair followed by my hands behind my back. She then grabbed her phone and sent a text. 30 seconds later there was a ring at the front door, feeling very vulnerable right now I felt very concerned about who it might be. I heard Sarah open the front door and greet who ever it was, she then led this person into the bedroom where I was sitting naked and handcuffed to a chair! "WTF Sarah"! I yelled. "This is Jason from my work" she said smarmily "and he's here to fuck me as your punishment". My heart sank as they began making out, they wasted little time getting undressed too and it wasn't long before Sarah was on her knees giving him a very enthusiastic blow job as I looked on in shock. Jason pushed Sarah onto the bed and buried his nice looking cock into her pussy, she moaned and I could see she was very wet. As Jason built up his thrusts with more intensity I could see her reach around and fondle his balls, this seemed to have the desired effect and he quickened his pace until he grunted as he unloaded his seed inside of her.

Jason withdrew his cock and a thick glob of cum appeared at the entrance to Sarah's pussy, she lay there not moving and started rubbing her clit slowly. Jason left the room naked and I heard him go out the front door, a few moments later he came back into the room followed by another man, "Sarah what is going on now" I yelled, "honey this is Simon, and since you put on 2 kg so i'm going to fuck 2 guys" she replied. I turned my attention back to Simon who was now undressed, he was certainly hung, the girth on his cock was bigger than any of the dildos Sarah owned! He climbed ontop of Sarah and eased his cock into her pussy bit by bit with every thrust, she squealed at first and then began to moan heavily, Sarah hadn't wiped any of Jason's cum away and Simon was using it as lube to fuck her deep. I could see a build up of grool around the base of Simon's cock and this was really turning me on I had a massive hardon. Simon pounded Sarah like she's never been pounded before for the next 20 minutes before he too pumped his seed inside of Sarah. As he withdrew there was such a mess around and in her pussy after being fucked with a load already inside her. Sarah lay spent but once the two men left she stood up and walked over to me noticing my hard cock she whispered "did you enjoy the show" reaching for my cock and giving it a couple of slow soft strokes, my cock was pulsating in her hands and then she did the unthinkable and straddled my lap. I looked at her and shook my head "no Sarah", she smirked, grabbed my cock and guided it into her well used hole. It felt so soft and gooey in there and the sensation was amazing, it wasn't long before I was over the edge and Sarah was receiving her third load into her pussy.

I surprisingly enjoyed this experience so have decided that for my next reward Sarah has to fuck 10 guys in a gangbang\tag team...to be continued