I had been pestering my wife for years to tie me up, and be a dominant woman in general, and finally one day she sighed and said "Be careful what you wish for, fool! The gloss is off this marriage anyway, and I'll do this for you,if you do something for me!" "Anything" I said, rashly. "Promise?" she asked sweetly. I agreed, and she said "I want another man to take part. Not negotiable. Take it or leave it!" Now desperate with desire at the possible fulfillment of my long-term fantasy, I reluctantly agreed. So, I dragged out the leather strait-jacket I had bought ages ago, and hidden, in the hope of using it someday, and she buckled me up in it, naked. "Cute!" she said, and used her phone. She took a photo of me, and said "You should have it any moment...okay, good, so what do you think? Oh super! I hoped you would like him...it! Come on over then!" She put the phone away, and began to caress me into almost immediate massive erection. "Mmmm! You like that! Good! Well, I bought something too, just in case I ever HAD to give in on this!" She produced a heavy leather helmet, and slipped it over my head, lacing it tight up the back, then padlocking three straps. Now I was more helpless than I had ever imagined! Blackness was absolute, hearing was impaired, but still there. I could breathe okay, until she locked a gag in place, a rubber lump shaped like a penis, with a small hole through it. Now only the twin holes over my nose, and the tiny 'tube' through the gag, gave me air. It was enough, but barely. She returned her attention to my straining erection, then after a while I thought I heard the door-bell. She stopped, and left the room, then voices came closer, and were back in the room. "Holy shit!" I heard faintly, then "Can I touch it?" "Sure thing! In fact, I have to go out for a couple of hours, so you guys get acquainted, so to speak,until I get back! You can do ANYTHING you want to him, except let him out! Okay?" Then she left. I had never even thought of intimate contact with my own gender, and the very idea repulsed me. His hands were cold on my hot skin, as he coaxed me back into full erection again, to my shame! I should not have been this....cooperative! It should have disgusted me, instead of making me crazy with desire! But there was absolutely nothing I could do, and before long, I was lost in the amazing arousal that swamped me. "Humiliating isn't it? Being desperate for the touch of a total stranger of your own gender! Wait til I make love to your wife, and all you can do is listen! Now THAT's humiliating! It'll make you crazy, especially when she's so obviously loving every minute of it, and you can do....nothing! Meantime I'm really enjoying wanking you to death! It's MY fantasy, to have an utterly helpless male, in my power, and be able to do ANYTHING I want, to him!" The wanking continued, endless and irresistable, making me crazy with need, as time passed so slowly! He was right, it WAS very humiliating to hear them coupling frantically right beside me, and to hear her scream her delight, for the first time! I knew with a sickening certainty that this development was permanent, and I had become her sex-slave, and his too!