Gina and I had been married for 4 years. Our sex life was good and we had tried some swinging with another couple but, while I enjoyed it, Gina's swinging partner had not exactly satisfied her. A few months ago Gina asked if I would like to watch another man, selected by her, fuck her while I played a cuckold role. I was quite shocked she had suggested this and asked for some time to think about it. I had always seen myself as a dominant male, I was reasonably endowed and had a high sex drive. To see myself in a submissive role was something I had never considered. However, as the days passed I found myself becoming more excited by the idea. Anyway I had always been open to new experiences. Over dinner one evening I told Gina that I was in favour of at least experimenting with it. She was delighted and said she would make the arrangements. It seemed she already had an alpha male in mind. She insisted I had to give myself over to her control when and if we were to go ahead. A week later Gina informed me that our new experience was to take place on Friday evening. She reminded me that I had to do as instructed. All Friday I was torn between anxiety and excitement at the thought of Gina being fucked before my eyes. After showers, dinner and a few drinks, Gina told me I was to come up to the bedroom and take off my clothes. She took out some handcuffs from her drawer, told me to sit on a chair close to our bed and handcuffed me with my hands behind the back of the chair. She then tightly secured my legs with some cord. Even this process was starting to get my cock hard. Gina noticed but said I would only get some release later. Gina then changed into a sexy tight dress, high heels, stay up stockings and no underwear. She looked amazing, her dress hugging her firm boobs, and when she bent over I was given a view of her shaved pussy which someone else would soon be fucking. Five minutes later the doorbell rang and she rushed off like an excited girl. I heard a male voice. A moment later Gina entered with a tall broad fair haired guy. His name was Tony and he was very good looking. He glanced at me tied up and said to me I hope you are going to enjoy this as much as me. The lay down and began kissing. This became more passionate as he ran his hand up under her dress to caress her slit which soon became wet with desire. After a few minutes Gina slipped out of her dress and got Tony to stand at the end of the bed close to me. He took off his shirt as she undid his belt and zip. She pulled down his pants to reveal the largest flaccid cock I have seen in real life. As she stroked it he became hard quickly. It was its thickness which left me flabbergasted, with a monster bell end. In length it was about nine inches but looked bigger due to his girth. Gina shot me a smile and engulfed the tip with her mouth sucking and licking enthusiastically. She then asked him to lie down and she attempted to mount him. She had some difficulty at first but as she got wetter her cunt lips slid over till about half of his member was in her. She rode him fast and he made short stabbing upward movements which made her gasp. It was not long before she let out a long moan as she climaxed. He pushed her off his giant dick and made her get on all fours. She positioned herself close to me so that I was going to get a close up. He entered her doggy style and pushed in his full length. Gina groaned loudly, and this increased as he proceeded to pound her cunt hard, his huge shave balls slapping off her thighs as he pummelled her insides When Gina and I fuck this way it is usually after she has come. She never comes doggy style but of course I love it. Now I was watching as a few inches away this thick cock was stretching my wife's cunt more than I ever could. He was like a man possessed, fucking her like an animal, merciless. I could tell he was getting close and thought surely she has arranged that he pull out and not come in her? I had reckoned without Gina's desire for this man. He grabbed her hair as he pounded her and she came in a long scream, and as he grunted he spurted his come deep inside her. Her body convulsed as she felt his hot jets of spunk go deeper in her body than ever before. They separated and lay back kissing and whispering in each other's ear. I was rock hard and seeping precum but of course I could not even touch my cock. I could see thick globs of his spunk dribbling out of Gina's pussy. After about ten minutes their kissing became more passionate and I could see they were getting aroused again. Her hand tried to encircle his hardening penis. He whispered an instruction and Gina moved her head over the edge of the bed beside me. He was now fully erect again, and I now realised what he was going to do. He stood astride her face and she began licking his balls from underneath. He then positioned his cock to enter her mouth. I watched in amazement as his enormous cock moved down my darling's throat. He began fucking her mouth then throat. I could see her throat being stretched open as he moved back and forth. He tapped on her windpipe as it expanded and contracted demonstrating to me how far in he was. Gina was struggling for breath so he pulled out. Gina spun round and opened her mouth wide. He began wanking his cock hard with the bell end pointing towards her tongue which flicked out now and again to encourage him to climax. He roared as his sperm shot from his cock. I could hardly believe how much he produced. I counted twelve large spurts, each like a dessertspoonful. After he has finished Gina stood up and leaned over to let me see the large puddle of seed in her mouth. Then I got a shock she straddled me, her cunt above my throbbing cock, now almost sore from lack of release. I looked up at her face and suddenly realised her intention. She almost completely closed her mouth. Was she going to swallow? No, the next moment she kissed me hard releasing all of Tony's cum into my mouth, darting her tongue to the back of my throat to force it down. At that moment a large drip of Tony's cum leaked out of her cunt straight onto my bell end. This was all too much for me, and so my wife's bull's cum dripping down my cock caused me to shoot my load, as Gina held my mouth closed forcing me to swallow his load. After a short rest and a drink he went down on Gina expertly using his tongue to bring her to climax. He then mounted her and fucked her hard for about ten minutes before depositing his third load deep inside her. Again, she climaxed as she thrust against him. I was again rock hard with being so close to seeing my wife pleasured by this monster cock.This was his parting shot, and within ten minutes he was dressed and gone, but not before he said he would like to fuck her again. She readily agreed. She lay on the bed panting, her thighs wet with both their juices. She told me what it was like when he came in her, and that she felt full of his cum inside. She said sorry for not telling me she was going to let him come inside her, and that really once he was fucking her there was no way she was going to tell him to pull out. I asked if she would release me to let me fuck her. he said she would but not to fuck her, and that she only wanted his semen in her cunt now. I could have oral but only after I had done one more thing for her. She undid the cuffs and freed my legs. She told me to lie on the bed, and she straddled my face with her thighs which were wet with cum. She then forced me to lick her gaping cunt, and as she virtually used my face to masturbate, great dollops of Tony's cum were licked up and swallowed by me. She had a small but intense climax, tightening her thighs around my face as she came. She then sat at the end of the bed and put my cock in her mouth. I have to confess I was rough, perhaps an element of revenge, but at least it was shortlived because I was so excited. I thrust deeply as I could into her mouth and shot a heavy load down her throat. Since that night she has not let me fuck her but she has arranged to see him again, and has told me she has come off the pill as she wants to get pregnant from her alpha bull. She says I can watch as he inseminates her but only if I will help her suck him off . Like the cuck I now am, I agreed.