I couldn’t have been happier. I had just completed a three week stint in the field and now I was heading home to my lovely wife Jennifer. Better still I had finished my assignment a day early and so I was going to surprise my wife. The only cloud on the horizon was that Jennifer’s ex-boyfriend Brett was going to be staying with us for a few days, since he was between international postings with the oil industry. Whilst Jennifer openly admits that Brett was the shallowest self-centered person and that she had known she could never marry him, I still felt uneasy when he came to stay. Despite them having broken up 10 years ago, I could see that my wife still had some feelings for him. After all he had dated her through University and had taken her virginity! Coupled with this thought was the fact that Brett was a hunk. He stood 6ft 4 inches and weighed some 200lbs and kept himself in fabulous shape. He always liked to boast about how many women he had bedded round the world, all of which merely served to confirm Jennifer’s opinion that she was well rid of him. And yet... every time he came to stay with us, I couldn’t help notice a certain wistfulness in my wife’s eyes. She seemed to become all soppy around him and sometimes she seemed to get all flushed when he described his latest female conquest. She had always refused to tell me about their time together and in particular their lovemaking. Every time I brought the subject up she steered the conversation away and so I had never really pressed it. All of these thoughts and emotions swirled around in my mind as I drove home and as I swung into our road, I was startled to see that Brett’s car was already parked in our drive. This was odd because he wasn’t supposed to be with us until tomorrow. Typical of him and I knew that would ruin the lovemaking I had planned for the evening. Something cautioned me from rushing into the house and announcing my arrival. Instead I sneaked in quietly. I could hear voices in the living room and peering through the crack in the door, I could see Brett and my wife sitting side by side on the settee. Brett had his arm around Jennifer’s shoulders and was saying things that I couldn’t hear. Jennifer suddenly made a show of stretching however and said that she was going to head for bed. She told Brett to make use of the television and that he knew where his room was. I decided to rush upstairs and surprise Jennifer, but again something made me change that plan. Instead I headed for our small box room which was located next to our bedroom. In this room I had built a secret door that lead into a concealed space between the two rooms. In this space I peered through the large two way mirror that I had installed. Why had I installed a secret two way mirror? Well it had become an obsession of mine to watch Jennifer masturbating. I always knew when she would be likely to do this and it was when she became fertile each month. She would go to bed and I would feign watching a late night movie. However I would sneak to my hidey-hole and watch spellbound as my gorgeous wife would slowly finger herself, tweaking her breasts and using her other hand to caress her clit and arouse herself until she achieved spectacular and noisy orgasms. How did I know they were noisy? Well I had also installed a sound system as well! As I waited I saw the light come on and saw that my wife was wearing a light summer dress with bare legs and, well well, those shoes! I had bought her a pair of five inch heeled strappy white sandals that showed her long lithe and toned legs off to best advantage, particularly if, and this was the case now, she had painted her toe nails. Anyway when I had given her these shoes originally, Jennifer had told me she would wear these the day we decided to start having children. She laughed and said they would be her ‘breeding shoes’ as she knew how they aroused me! So why was she wearing them now? She hadn’t worn them to my knowledge since I had given them to her. She said they were too special to spoil. And yet here she was wearing them, not knowing that I was coming home early! I started to get a queasy feeling in my stomach. Was she putting on a show for Brett to tease him and show him what he had lost? My thoughts were interrupted by the appearance of Brett, bare-chested in the doorway to our bedroom. “Jennifer, I’m going to turn in as I’m tired. I was hoping though I could get a goodnight kiss first? “So saying he took a step toward my wife and looked expectantly. “You always were arrogant, weren’t you Brett. What makes you think I would give you a good night kiss?” “Because I know you want to, come here.” Brett stretched out his arms and seeing Jennifer’s hesitation he took her hands and pulled her toward him. When she reached him he bent forward and kissed her without asking her again. Jennifer looked surprised but didn’t push him away. Perhaps taking this as a sign of her compliance, Brett put his arms behind her and pulled her close so that she was squashed up against his ripped torso. This time Brett aggressively assailed her mouth and I saw her open her mouth and accept his probing tongue into her mouth. I could tell they were fencing tongues and really having a good snog! Jennifer suddenly broke away and said, "Brett how dare you. I’m not your girlfriend any more, I’m a married women." "Oh come on Jenni,(only he had ever been allowed to call her this), don’t be such a prude. In any case I know you enjoyed that. You swapped tongues with me just like old times." "That’s not the point,” said Jennifer, "it’s just that I... I am..." "You feel horny, don’t you, that’s what you feel. Your body wanted the touch of a man?” “No, I... that’s not what I mean, it’s just that..." Jennifer never finished her sentence as Brett moved quickly behind her and putting his hands on her hips started to nibble and lick her neck and ears. I knew from my own experience that this always got Jennifer aroused and sure enough as I watched her resistance started to melt. "Oh Brett, please don’t it’s not right, you shouldn’t, I ohh..." The cause for her intake of breath was Brett whose hands had come round to cup her breasts through the thin fabric of her dress, and since she wears no bra (her breasts are fabulously firm 34B’s) and I could imagine how she felt. In retrospect I know I should have made my presence known at this stage. However part of me was incredibly turned on by the spectacle (in the same way as when I watched her masturbate), but also I wanted to see at what point my faithful wife would put a stop to Brett’s attempts to get into her pants. I was fully expecting him to be on the receiving end of a slap across the face at any second. But no, how wrong I was! Standing behind Jennifer I could see him fiddling with the tie of her dress and ever so slowly he undid the ribbon and then whilst still nibbling her neck he gently brushed the straps clear of her shoulders and the dress slowly slipped off her and pooled at her heels. My god she looked fabulous. Standing there in nothing but thong panties, five inch strappy sandals with red painted finger and toe nails and her brunette hair cascading around her sexy neck. I noticed Brett fumbling with his trousers and as they fell to the floor as well I wasn’t entirely surprised to see that he had no underwear. Seeing him naked answered one question that my wife had never discussed with me. He was hung, I mean really hung. Even in his semi flaccid state he had more than my 5 inches and I could just about make out what looked to be an impressive pair of balls to match. He could have been a model or a porn star with a body and equipment like that. No wonder he had got into the pants of women all around the world! As he brought his hands round to cup my wife’s pert breasts he stepped into her back and I could see his erecting penis push up her back. Although I hated to admit it, they looked good together and I could see how and why as a teenager at college she had fallen for him. As I watched and listened I could hear Jennifer moaning as Brett lovingly squeezed and played with her breasts, tweaking her sensitive nipples until they were standing proud and erect. Suddenly Brett stopped his ministrations and picked my wife up in his arms as if she weighed nothing. He slowly walked with her over to the bed, our bed, our marital bed which we shared as man and wife. The symbolism was not lost on me. He was showing her that he was going to take her on her marriage bed and husband be dammed! Again I knew I should do something. Instead however I dropped my pants and pulled my aching cock from my underwear. Deep down I still thought Jennifer would stop this before it went too far and yet part of my brain wanted to see him succeed. Wanted him to give me a display of how he used to fuck my wife before I knew her. I was so conflicted by emotion and light headed on desire. My wife seemed to have been in some kind of a trance for a while and it wasn’t until she felt Brett laying her down on the bed that her senses returned. “Stop this Brett, I can’t do this, I’m married, please.” “It’s ok,” said Brett, “I’m going to lick you like I used to, I’ll make you feel so good.” “No, please Brett, don’t... I... oh my goodness Brett... yes just there, please, I oh..." The cause for her about change of loyalty to her husband was the feeling of Brett’s tongue as it lapped her sex and caressed her sensitive clit. Before long her hips were lifting off the bed and were weaving in the air. I noticed her fingers had also found their way to Brett’s head and were running through his hair as he pleased her. I could hear the familiar sounds of my wife starting to get aroused. The sighs and ah’s and moans that built and built as Brett relentlessly worked on her sopping sex. After several minutes of his ministrations Jennifer stated to sob and cry out, “YES! Oh my god yes! I'm coming... coming just there... yes, yes, ohhhhhh!” The room was filled with her shrieks as she came and came on Brett’s tongue and drenched his face in her love nectar. Lucky bastard I thought, that should have been me. Brett in the meantime had moved up and over Jennifer and was kissing her. As he did so I could see him using one hand to direct his hugely erect cock at my wife’s vagina. When my wife felt what he was doing she said “ no Brett, not that, I can’t let you have me. My marriage vows, please." “Oh come on Jenni, you know you want it, you’re desperate for a man to get between your legs. No one will ever know, just you and me. Come on just for old time’s sake." This was crunch time. Would my faithful wife rebuff him or was she too far gone? It didn’t take long for me to find out. “Ok Brett, get a condom from the drawer, and you can just once." “Sorry Jenni, but just for once I’m not going to use a condom. You made me wear one all through college, because of your religious beliefs. Well this time and just once I want you bare." “Brett no, I’m not protected, please. I’m also fertile; this is a really bad time for unprotected sex.” “Well that settles it,” said Brett, “bareback it is." So saying I watched in disbelief, in denial but also in lust as a voyeur watching another couple fuck, as Brett pushed forward and the bulbous helmet of his nine inch cock pushed into the womanhood of my darling wife. No words can do justice to the sight, the sounds or the feelings coursing through me as I watched another man taking my wife. Pushing a big cock into her sodden snatch, watching her moan and flail around as she succumbed to her old lover. Once he was fully embedded right up to his big balls which had to be nestling up against Jennifer’s pert bum, he stopped and raised himself up on his hands. Brett and Jennifer locked eyes. “Doesn’t that feel good?” asked Brett. “Yes,” said a breathless Jennifer. “Brett, promise me one thing please.” “What Jenni?” “Please promise me you will pull out before you come, please Brett, I’m begging you. I can’t get pregnant by you, James would divorce me." “Whatever,” was Brett’s noncommittal reply as he started moving his huge cock in and out of my wife. So there it was. My wife had gone from being a faithful wife to a cheating slut within less than an hour. She had succumbed to her ex boyfriend’s charms and more particularly to his big cock. She had spread her legs and let him put his bare cock into her knowing full well that she was fertile and unprotected from pregnancy. As I watched and listened to their love making I at least now knew why Jennifer had refused to discuss the size of his tackle. He had been and was still much bigger that her husband and although she had found him a jerk, she still longed for his big cock. Masturbating furiously I still wondered why I wasn’t rushing in to stop them. As much as I hated to admit it, I was turned on by watching another man service my wife. I realised that I had always had such feelings about wanting to see her screwed by a better endowed man, but had always been too afraid to mention it to her. Well now I had a ring side seat to her infidelity. Brett slowed the pace of his fucking and took hold of Jennifer’s long legs and put them over his shoulders. As he resumed his thrusting Jennifer said “Oh Brett you are such a stud, you feel so good." “Better than your husband?” “In bed yes, you are just so manly, a stud." “Well,” said Brett, “you know what studs do don’t you, they always seed their mares." Jennifer laughed in response. “What’s so funny?” asked Brett. “Seeing my shoes over your shoulders reminds me that James bought these for me and I told him that I would only wear them when I was going to be bred and with our first baby." “Oh Jenni, I want that so much, I want to put my baby in you and watch your belly swell with our love child." “No Brett, you promised!” said Jennifer. “I know," said Brett, "but knowing you're fertile, unprotected and wearing those ‘fuck-me pumps’ which you promised to wear when he breeds you is too much. I’ve got to have you completely Jenni, I’m going to seed you and make you a pregnant wife." “Oh god Brett, I can’t! My husband... oh but I do love your big cock... I can’t think clearly. You will have to think for us, I’m so full of you. Your cock is against my cervix and my womb is getting ready for conception. Oh yes fuck me pregnant Brett. Let me have your spunk deep in my womb!” I couldn’t believe the words coming from my wife. She had completely lost it and had surrendered to Brett’s big cock. Unless I rushed in and separated the copulating couple, I knew Brett would mate with my wife in front of my eyes! So what did I do? Nothing of course! Just like the rutting couple in the next room, I was also too far gone now. I knew I had to see the ultimate betrayal of our marriage vows. Had to witness the moment when my wife willingly accepted the virile sperm of an alpha male into her open, ripe and fertile womb. A womb that had no defence against the impending blast of DNA that was not her husbands, but was that of her first love and first lover. As I tried to time my ejaculation with their mutual orgasms I could see their mating was reaching a crescendo. Jennifer had locked her long legs around Brett’s muscular bum as it drove his big baby maker towards making her a mummy. God her painted toenails encased in strappy stilettos looked so dam sexy as they worked to keep Brett in place. And then it happened. Brett cried out, “Oh Jenni my love I’m coming, going to give you our baby, oh here it comes." “Yes, yes shrieked Jennifer, give it to me, fill me, seed me Brett, I want you baby." As I watched Brett tensed and roared and the clenching of his bum cheeks told the story of sperm being fired direct into my wife’s cervix. Her simultaneous orgasm ensured that Brett’s sperm was helped on his way. His big balls which had not been emptied for over two weeks were now discharging their contents directly where it counted. My wife mewled and sighed and held onto Brett’s muscular back as he continued to seed and impregnate her. She knew it, he knew it and I knew it. She had been bred in the most erotic and sensual manner, only not by her husband as it should have been. Instead a superior male had beaten me to her eggs and had stamped his DNA on her baby. I looked down at my sticky hand and realised I had spunked all over myself. Taking my flaccid cock in hand I took one last look through the mirror and saw the lovers whispering sweet nothings to each other. Wondering what to do next I became aware of movement from Brett. He was gently humping into Jennifer. “Oh Brett, you can’t be hard again so soon, you are so, oh yes Brett, yes, again, make love to me again and make sure I’m pregnant." I’d heard and seen enough. Tidying myself up I crept out of the house and found a motel, where I had a restless night. The following evening I went home again to find Brett’s car gone and Jennifer answered the door. She looked radiant as she hugged me. But then she should, having no doubt been fucked silly for 24 hours! As I made my way into the house I couldn’t help wondering what would happen in nine months! After all I wasn’t going to give her the get out of pretending it was my baby. Oh no, there would be no bareback sex between us until I knew if she had caught or not. And then I always had the video evidence. Did I mention that?