My wife told me that she fantasized having a bull. This was after telling her that I fantasized about making it with two women at the same time. A few days later I was just getting into bed when Sarah started her role play. It was nothing new and was often the start of a great sex session. "Is all this for me," Sarah asked as she wrapped her hand around my rapidly hardening cock. "It's so big and black," she continued. At seven inches my cock was not that big and it certainly wasn't black. She kept up the role for some while until my cock was filling her mouth. It wasn't long before we were in the sixty nine position with my tongue in her pussy as she suck my cock. Then as we moved to make love she got into the doggy position saying, "Come on you big black brute and fuck me." Well I did my very best at pleasuring her by slamming my length as deep as I could and for as long as I could. Afterwards as we lay there I asked was her fantasy one that she wanted to try or just one to fantasize over. Sarah lay thinking for a few moments and then told me that she really did want a bull, but he didn't have to be black, just well endowed. I spent lots of time on the web reading about couples that had engaged with a bull. They were mostly good, but the odd one had gone disastrously badly. I found one couple that had only good things to say about their bull. The husband would watch them and serve them with drinks and make sure that they both had a good time. I wasn't sure that I wanted to watch or that Sarah would want me there. I contacted the couple to ask them more questions. I was surprised when they answered me and passed on their phone number. I spoke at length with Ted and he said like me he wasn't sure about things until it finally happened. Now he couldn't contemplate Rana his wife fucking her bull without him being there. I was surprised when he handed the phone to Rana who told me that she loved Ted being there and that it made her feel so safe and loved. In the conversation she told me about her bull and his ten inches. She also told me that Ted had just over four inches and as much as he tried he just couldn't satisfy her. The discussion made me feel much happier to let Sarah try a bull. That was when Rana told me that if I lived close enough she would lend me her bull. It then transpired that we lived just under twenty miles apart. Rana told me that her bull Charles was coming to her on Friday night and if I wanted she was sure that he wouldn't mind me watching him servicing her. I thought about it and rang back the following day and arranged to go and just watch. I was with Ted sat on a chair when Charles came into the bedroom with Rana. He spent ages undressing Rana and kissing every bit of skin he could as it became exposed. Eventually when she was totally naked he laid her on the bed and licked and sucked her pussy and played with her tits until she had several orgasms. Then he climbed between Rana's legs and Ted moved from his chair and took hold of Charles's huge cock and fed it slowly into his wife's pussy. Charles fucked Rana for a good twenty minutes and two more orgasms. Then as they rested Charles fetched them drinks and asked if they needed anything else. Charles had Ted wank his cock until it was hard again. Then with Rana in the doggy position Ted again steered and fed Charles's cock into his own wife's pussy. Rana had several more orgasms before Charles pressed firmly home as he filled Rana's pussy with his cum. After they had recovered Charles was kissing Rana in a sensuous kiss. Then Charles dressed and Ted shook his hand as did I, then Ted saw him out the house. There wasn't anything seedy, dirty or nasty. Just good clean safe fun and I could see that Ted had enjoyed watching his wife as much as she enjoyed her fucking. Then Rana kissed me with a passionate kiss and handed me Charles's phone number. Later that night I rang Charles and asked if he would be interested in servicing my wife. He said yes and we agreed on the following Saturday night. It took me two nights to get up the nerve to tell Sarah that she was going to be serviced by a bull on Saturday. As you can imagine she had hundreds of questions. Saturday came and Sarah had dressed and made up for her first bull and she went and laid on the bed. I almost couldn't control myself and leap on her and fuck her myself. Fortunately Charles arrived a little early. I let him in and led him to the bedroom. I watched as he slowly undressed Sarah licking and kissing her all over as he had with Rana. Then he was sucking and licking Sarah's pussy. Sarah is sensitive down there and came quite a few times before he climbed between Sarah's legs. He stopped and looked at me. I wasn't sure whether to just nod or to steer his cock as Ted had. I decided on the latter option. Up til this point Sarah hadn't seen his cock and as I steered it in the length and girth started to stretch Sarah wider and deeper than she had ever been stretched and she shouted, "Bloody hell. That's big." Charles stopped for a moment to let Sarah get used to it. She was having none of it and insisted that he just put it in and fuck her. Fuck her he did. Right through four or five further orgasms before he came deep inside her pussy. Like Ted I went and got them some drinks. After his drink he lay back on the bed with Sarah. I wasn't into wanking him, not that I needed to as Sarah was down trying to get as much of his cock into her mouth as she possibly could. Ten minutes later he was hard again. Sarah doesn't like doggy position that much, but was quick to tell him to lie on his back. There is no better sight than watching your wife slipping down the hard cock of her bull until she has him balls deep in her pussy. Sarah didn't last long before she came again and collapsed onto his chest. Charles just put his hands around her waist and raised and lowered Sarah on his cock as if using a blowup doll to wank himself. Sarah was constantly groaning and came twice more before Charles came and lowered Sarah onto his chest again. They lay like that for some while before Sarah lifted herself of Charles's still semi hard cock. Sarah bent down and kissed it, but didn't put it in her mouth. Then she waddled off to the toilet. On her return I could see her pussy was still gaping from the huge dick that had been in her. She thanked Charles and declared that she couldn't have taken any more of his cock. She kissed him swapping tongues and when they parted she started to dress. Charles also dressed and I saw him out. Charles became a monthly fixture in our lives and I would sometimes join them in a threesome, but mainly I would just watch as Charles pleasured my wife. Then for some reason after six years Charles suddenly moved away. I offered to find Sarah a replacement, but she said that she had fulfilled her fantasy and that it was time that I fulfilled mine.