Read 1,2,3 first.
Before I carry on with the story, this all happened when I was in my 20s. I didn't even know about cuckolding at the time. I had a really good sex life with Emma. My love for Emma is why I was jealous at times. I didn't know what was happening to me, why I was turned on about the thought of her being fucked by someone eles. I believe my jealously was due to me not understanding my fetish straight away.

The day I found out about Emma and  Mark was a crazy day for me. I sat in my car for a very long time after seeing them fuck in my bed. I kept wondering how long it had actually gone on for and how they had hidden it from me. Mark was my best friend, although we didn't spend asmuch time as we used to together, we still spoke pretty much everyday. Thoughts were popping into my head about times that I might of called him why he was fucking Emma. I'm sure there were times he'd texted me asking where I was and what I was up to Whilst I was work. I imagined him sending these messages why Emma was sucking his cock.

I started to become really turned on by my own thoughts. I was imagining stuff that probably hadn't happened they were becoming dirty and perverted. I imagined licking Emma's pussy not knowing Mark had been there earlier, filling her with his cum. I imagined Emma kissing me after she'd had his cock in her mouth. I was loving every minute of it.

I texted Emma that day to say I'd be home early. When I got there she was watching TV on the sofa. The apartment smelt fresh and it was really tidy she had obviously hidden the evidence. I sat down and cuddled up next to her. I whispered "I love you baby" she turned to Me and smiled she looked me straight in the eyes and told me she loved me back we shared a passionate kiss. I really enjoying kissing her that day. Her lips felt so smooth and wet. I was imagining them around Marks cock pleasing him. I had completely lost it the only thing I could think about was Mark fucking her.

I didn't tell Emma I knew about her cheating with Mark. I did check her phone most days. I found a out a great deal about their secret sex life. They had been fucking alot. The texts weren't loving texts, Mark would always refer to her as his slut and would be very vulgar. There were short texts on some days just saying "are we fucking" reply would be "yes". The texts I really like to read were when Emma must of really wanted it. She would describe what she was going to do to him when he got round. One said ,She will be waiting on her knees by the door until he got there. She needs his cock in her mouth and pussy.There were also texts regarding me, about what time I was home or leaving.

Instead of confronting her. For the first few weeks I just let it carry on. I was wanking furiously over them. Knowing they were fucking while I was at work. I would come home and put it on Emma straight away. She would sometimes turn me down which I didn't mind, more wanking. There were days I would really attack her, pushing her into our bedroom and onto the bed where Mark had fucked her earlier. I would always go down on her first. My head between her legs for ages my tongue deep inside her sucking her juices. She would always cum for me aswell. I really liked that I could still make her orgasm knowing she had already had several from Mark. I liked to think she was getting off on me not knowing Mark had cum in her pussy. i was now cleaning her out. I really started to taste it inside her, which made me belive she was keeping it in her pussy for me. I would then climb ontop of her and fuck her. The days that I'd tasted cum in her pussy I didn't last long at all and would cum after a few pumps. She would ask me what had got me all worked up. I liked to think she new really.

After a few weeks of this I did get a little bored. I always read her messages at every opertunity they still fucked but not as much. Mark was just using Emma when he couldn't fuck anybody eles. Emma obviously didn't mind tho she always said yes, She was getting the fucking she needed. I decided on helping her get more cock from Mark.  There was a time I purposely left my wallet at Marks house. The next day I was at work. I rang Mark and asked him if my wallet was there. I told him that Emma would come and get it for me. He happily agreed. I called Emma straight away and told her about the wallet. I told her Mark was expecting her. My cock was rock hard  talking to her, I knew I was sending her to get fucked. I told her I need the wallet at work later so could she drop it off. I masturbated at work as time ticked by. I knew she would be getting fucked by Marks big cock and I had set it up for her. When she arrived at work I ran out to the car she handed me the wallet. I lent in and kissed her deeply. I thanked her and asked her if everything went OK, was Mark OK? It was a normal question but in my mind it ment something different. Emma did look a little startled but quickly replied that "yes he was fine". I can remember checking her phone that day. Mark had messaged her saying "hubby wants you to come to my house to get his wallet. Your going to have to earn it . show me how much of a slut you are."
Emma had replied saying "I'm on my way, my pussy is already wet, please give me the wallet I'll do anything". I masturbated so much to that text. They started fucking more again.

One night we were at a friend's wedding Mark was there too. The three of us were having good laugh. We were getting really drunk. Them two never showed any intrest in each other in front of me it was very weird and disappointing for me of course. They were cheating and not really cuckolding me I was kind of cuckolding my self. I decided that night I was going to tell Emma that I knew about her and Mark. I played out the conversation in  my head so many times and the best way to do it. I decided to do it while we were fucking. That night we got in bed together and I took my position between her legs I was sucking her pussy and inserting my fingers at the same time. She was really turned on it was probably the alcohol and being with Mark all night. I pulled my self up to her and positioned my cock to her pussy. I slowly pushed it inside her. She shivered in excitement underneath me. I whispered in her " Jack can't fuck you like this" her body tensed up it had been along time since we'd played our fantasy game. She moaned Marks name. It felt amazing just hearing her moan his name was enough for me.

I lowered my self on top of her even more so she was really trapped under me. I placed my head next to hers. She was still moaning Marks name. I whispered in her "I know you've been fucking Mark" I felt her tense she let out a louder moan. " I know you've been fucking him for months I have seen you fucking him".As I was saying this I was still fucking her. She was responding more than she's ever done before. She was digging her nails into my back. " I want you to fuck him, I want you to fuck him infront of me" she's was trying to arch her back while under me. She was shaking and moaning as I was still fucking her. "Please will you fuck Mark for me" I whispered in her ear.  That was it, it was to much for her she screamed "yes" as a wave of pleasure come crashing over her. She said it again,  "Yes I'll fuck him for you". That was it for me, I exploded inside her.

I know she had been fucking him for a ages before that night, but now that she was aware I new and the fact I was turned on about it Really changed my life.