I (35M) had a fantasy for a long time of sharing my wife ( 33F) with another guy but never told her about it. I had though indirectly hunted at her that she can have other bfs if she wants to and I'm ok with it. She never used to agree to it but just brush it away. Around 3 months back once day she suddenly responded that she might take me for my word and get another guy. I thought she was joking as usual but told her that she could. A weekend before Christmas we had thrown a Christmas party at our place and invited a few of our common friends. In that party, I did notice that one of the guys ( 30M) from her work were extra flirty towards her. I think it was mostly verbal but nothing exactly happened. On Christmas Eve he threw a small get together at his home and invited us over too in a similar fashion and a few of his friends. Right from the beginning I kept noticing that that had been silently flirting with each other. When the party ended, we were the only ones left back, so he insisted that we can stay in the guest bedroom and leave in the morning and we accepted. As we were up late, we work up late the next day and went home. On the way, my wife confessed that they both had hooked up at his place then. She says that she didn't want to hold back and wanted to come clean . She had says she might take me for my word of finding another guy and this is that guy. Initially I was a bit taken back but soon composed myself and told her that she can go on seeing him as long as she let's me know of her whereabouts. Since that night, every night leading up to the new years eve, they have been hooking up back at his place. She never stayed the night, but always came back home. On new years eve, he invited us again along with another 2 couples for new years party. This time again we were the last ones. But this time my wife wanted to stay back and asked me to go back home saying that he will drop her home in the morning. This morning she came home and told me all about how it went. But now she had a new ask: 1. They both have decided that they will keep at this whenever they get a chance. Whether it's at my place or his or maybe somewhere else 2. He has given her a cock cage to make me wear it. They have agreed that he will be the key holder. So whenever they meet, if I'm around, he will open it for me and let me play with myself. If they are not able to meet, even I'll be kept locked so I can't play. They will try this for one month and see how it goes and then decide if they need to change anything.

The cock cage wasn't a part of my fantasy, but it doesn't seem like that have given me a choice. So it seems it's going to be a good New Year for us after all