From a husband to a kitten
The agreement between me and my wife, Susan, worked well. She felt much safer now, that I was locked in a cage, and she was the one holding the key. It was the only way for her to feel calm and to be sure that my cheating days are over. She also started enjoying the punishment I offered her to inflict on me, which were so commensurate with my crime, watching her have sex with other men. She got used to the semi-open relationship we had, and even started assigning me various tasks related to it. Sometimes she even asked me to approach men she liked, when she herself was too shy to approach them. I got used to my new status and fulfilled the tasks she assigned me. Sometimes I even took the initiative to draw her attention to a man I thought she would like. She had a special twinkle in her eye when I addressed, on her behalf, to the man I proposed, after she approved him. She loved being the key holder, and the new power it gave her over me. She provoked me and agreed to release me only when she was completely sexually satisfied from one of her lovers or from oral sex I had provided her. Often only when both conditions were met.
Everything took a dangerous turn when she knew Mark. He took control of her completely, and after several visits he demanded that she let him hold my key. When she stuttered and evaded, he just left, leaving her hungry for sex. The next time he came to visit and demanded the key, she handed it to him without arguing and even enthusiastically. Small price for her to pay for his big penis.
From that moment on, I had a new key holder and master.
He attached the key to his keychain, next to his BMW key, and used to throw the keychain on the dresser at the entrance whenever he came to visit.