My partner, Gavin, and I have been together for 4 years. We had decided we would put off having children for a few years since we were both in our late twenties. We have an excellent sexual relationship. Gavin haS a nice seven inch cock which gives me great pleasure, especially when heejaculates inside me. That always makes me cum without fail. Recently Gavin asked me, as we were having sex, if I ever fantasised about fucking a man more well endowed and mentioned that he would love to watch me being fucked by a man with a big cock. I replied that yes I did fantasise about that, but he was enough for me. He said it would really turn him on to watch me in such a situation as he had been watching cuckold porn. We watched some together and I was excited by it, in fact we had a great fuck after watching. Eventually We discussed moving this into reality. My only problem is that I love bareback fucking as the best bit for me is when Gavin comes in me. He said we could advertise for someone who would agree to full sexual health check. So we put an advert on a few swinging sites with a summary of what we were looking for. We got several replies, one or two interesting ones but frankly none of their dick pics were that impressive. Then we got one from a very black, handsome African man with a large flaccid dick. He agreed to do the health check if we did too. Gavin said we should try him. So we set up a meet, got the checks done and we were all clean and clear. We arranged for him to come to our house that night. Both Gavin and myself were nervous but eager. I dressed in a short black number with black sexy underwear, a bra and thong. When he arrived, Toby introduced himself politely. He was 6 foot tall, broad, gorgeous with a lovely smile. After a drink he and I danced to some music Gavin put on. He was gentle and sensuous in his movement. I could feel a bulge against my stomach. Gavin was smiling at the hungry look on my face, one he knew meant I was aroused. We decided to move to the bedroom, where Toby unzipped my dress asGavin undressed to his boxers and took a seat beside the bed. Soon I was on the bed wearing only my thong. As Toby peeled off his shirt I undid his belt and zip, pulled down his trousers and pants to reveal a huge nine and a half throbbing, erect black cock. It was not only the longest cock I’d ever seen, but the girth was so thick. His bell end was enormous. I let out a squeal of delight, and Gavin gasped. Toby laid his cock ain’t my thong to display to Gavin just how far inside me this cock would go. I am petite with narrow hips, and I was sureI would not be able to take it. How wrong I was. Toby slipped off my thong I sat up and took his cock as best I could in my mouth, sucking him to about 4 inches. He grabbed my head and pushed in further, then out, then in more. I could feel his bellend stretching my throat. Then he pulled out, pushed me back on the bed and I opened my legs wide, my high heels still on. Gently he moved his monster cock inside me to about 5 inches. Suddenly m body began to twitch and convulse in an intense orgasm. This had never happened to me before. Gavin had a delighted but surprise look on his face. As it subsided Toby the moved in balls deep. I swear I have never felt so filled by a cock. He was touching parts of me Gavin had never reached. For five minutes he thrust slowly and gently getting me used to his size. Then, all of a sudden he began hard fast plunges. Again I could feel myself about to come. Three or four minutes of pounding ended when he groaned and released spurt after spurt of cum in me. This sent me over the edge into the most intense orgasm of my life. No man has ever sent that much sperm into my cunt. I was flooded. He stayed inside me for a minute then withdrew and lay beside me. I realised I had forgotten all about Gavin during this. I glanced over but his whole attention was on my gaping spunk filled cunt. He was naked, fully erect, his cock leaking pre cum. Toby and I lay kissing, my hands exploring his wonderful body. Soon he was hard again. He flipped me over to take me from behind, one of my favourite positions. I raised to my knees opened my legs to invite him in. Some thick spunk dripped from my cunt. Toby the quickly thrust into me. He began to fuck me hard. He reached forward and grabbed me at my elbows so that my upper half was off the bed. My tits were swinging to his thrusts, deeper and deeper. The, expertly, he quickly moved his grip to my wrists. His fucking me now became almost brutal, without mercy. I climaxed loudly at his relentless pounding. I realised I was vocalising my desire, begging for his seed. Toby stopped momentarily to ask my why I needed it. I said it will make me cum again. He asked if I was sure there wasn’t another reason. Suddenly I said it longingly, shocking myself. I said I wished I was not on the pill so his seed could make me pregnant, and that I wanted his baby. Toby smiled in triumph, looking at the despair on cuckold Gavin’s face. He then banged me without mercy, until he released again another load of his fertile seed into my womb. We both collapsed onto the bed. After a rest, and a drink, to my surprise Toby was again hard. He said he wanted to come in my mouth. He sat over my chest and presented his beautiful member to my lips. I sucked as best I could, then he was fucking my mouth hard. He came with a loud groan. I got about 5 huge sports in my mouth, swallowed some, but a lot dribble out. He withdrew shooting over my face and tits about another 8 strings of thick cum. I was drenched. Toby then got dressed, thanked us both, and sad to me that if I wanted him to breed me instead of Gavin, then I was to come off the pill, stop fucking Gavin, and he would oblige me with a baby. Gavin put his boxers on over his raging hard on. He had not come. He saw Toby out, returned to the bedroom to me lying legs apart, filled and covered in Toby’s cum. He wanted to fuck me but I was a bit tender. I reminded him of the role a cuck plays at this point, cording to the porn we had watched. I told him I wanted a thorough clean, starting with a full kiss. As Gavin kissed me I thrust my spunk covered tongue far into his mouth so that he could share Toby’ spunk taste. He seemed a natural. Soon he was licking up thick globules of Toby’s seed from my tits. As he made his way to my cunt, I flipped him over, straddling his face and made him clean out the copious amount of spunk that gravity was draining out. He must have swallowed more of Toby’s sperm than even I had. I then let him fuck me. He came quickly and came a lot, but for the first time I did not. Gavin then asked me if I meant what I had said in the throes of passion. Did I really want Toby to make me pregnant? I then completed his journey to being a cuckold by explaining how in nature, female animals and insects always sought out the alpha male for breeding. I said I was sorry, but if we were going to have a family it would be Toby who would inseminate me. He seemed a bit crushed but I think he understands he took me on a journey there was no coming back from. His seed would never be able to compete with Toby. As a lover he would never be able to compete. His job would be to tend to us both, perhaps even sucking Toby to get him ready to breed me. The complete cuckold.