I work a way from home a lot, only getting home once or twice a month. Not great for our sex lives so when I was home we always had lots of shagging to make up. Even so after 6 years of marriage things were getting stale. I'm not sure how the subject arose but we talked about being more adventurous, maybe swinging, inviting another guy to join us or perhaps swapping with another couple. We looked at sites like SH and Sue seemed hot and cold about the idea, one minute ready to go ahead then not so sure. She said she had a problem with me being there watching another guy fuck her. I suggested that first she should pick up a guy and have sex with him while I was a way and then tell me what had happened. I really wanted to see her being fucked, another blokes cock sliding into her tight cunt. If she took that first step and let one guy fuck her I reasoned it would lead to more and she'd let me watch. She said she'd think about it whilst I was away. I phoned almost everyday, asking hopefully, if she'd picked up someone to have sex with. About 6 weeks later she told me she'd been out, been chatted up, but she'd changed her mind and wouldn't do it again but she'd make up a story. The story was really filthy and they got filthier over the next few weeks. Initially they involved just one guy fucking her then she introduced two or three more. She was getting really into it, using a dildo, making all the sounds, moaning as if she was being fucked. As I wanked I could imagine her fucking herself with the dildo, bouncing on the bed making it squeak, or hear her hand slapping against her pussy as she masturbated. It was incredibly realistic. With hindsight some of the moans, sighs and grunts and groans sounded distinctly masculine. I'm sure at least once I was listening to her being fucked. I asked her several times if she'd actually do it, her reply always the same, she thought being watched having sex would be embarrassing. We fucked when I was home, though she seemed distracted sometimes. I eventually dropped the idea of her fucking another guy, little knowing the seed that had been sown and that most of the stories she'd told me were true and several times I'd been listening to her being fucked. It sems obvious now but I assumed she was masturbating and getting carried away. I found out what she was doing by accident. We were supposed to be going to a barbecue, organised by her work. A day or two before, it appeared I wouldn't be able to get away in time to attend. Thinking about it now, she didn't sound to disappointed when I rang. As it happens I finished earlier on the Friday than expected and decided to surprise her, even though it would be getting on for 10pm by the time I got to the pub. Sue rarely drinks, so I expected to see her car. I parked up didn't get out immediately, dealing with several text messages on my phone first. I noticed people I recognised leaving, replied to the last text, looked up and saw Sue next to her car. I was about to get out, but there was something about the way she was behaving. Her car was in a corner, only just enough light to see her and she was looking around furtively, as if to make sure no one was about. Satisfied no one was looking, the reason became clear, she was wearing a loose summer knee length dress, she unbuttoned it and took it off. Underneath she was wearing what I at first thought was a slip then realised was a micro dress which clung to every curve and hardly covered her bum. She is 32 years old, has long toned legs, a narrow waist, 34dd tits, tipped by highly sensitive nipples which she loves having sucked. Standing there, dressed like a prostitute, where she could have been seen by anyone, she didn't linger. She bent over put the dress she’d been wearing in the car, the dress she now had on, rising revealing her naked bum, if she was wearing anything it was no more than a string. She swung her long legs into the car, closed the door and started the engine. I ducked down as she passed my car, I didn't think she'd recognise it, one black Ford Focus looks much the same as another and she couldn't even remember the number on her own car. My cock was hard just from that glimpse of her, but what was she doing and where was she going dressed like a whore. I watched the car reach the road, she turned left, away from our house. If I was going to follow her I needed to be quick. I pulled out about 150 yards behind her, closing up at lights dropping back on a long straight. At the end of the straight about a mile outside town a roundabout. She took the third exit into an industrial estate, small units of varying sizes, most in darkness. I followed, lights off, slowing as she turned down a road on the right. I coasted up to it, looked seeing her pulling up outside building about 50 yards away. I stopped as soon as I was out of sight, ran back to the corner in time to see her, illuminated by the light from inside the building, as she went through the door. The door closed, the surrounding buildings and road dark. I hurried to the building, my heart thumping. A window next to the door, frosted glass probably a toilet. I circled the building, plain walls, but at the back a steel maintenance ladder up to the flat roof next to a fire door. I was desperate to find out what she was doing and climbed up. Set in the roof was a raised area, windows looking down on the workshop below. I crept over quietly, one of the windows was slightly open. I crouched down next to it, moving slowly until I could see most of the room below. Although by then I was certain what I was going to see, I was still shocked. Sue was already naked, bent over picking up her thong. With her in the room were four men, or to be more precise four black men. They were undressing, two were aged about 25, the other two between 40 and 50. Beside being black the other thing they had in common was they all had large cocks. Not massive but larger than average all of them probably between 7 and 8 inches. Sue was leaning against a work bench, legs parted, fingering herself. Through the open window I heard her asking where the others were and one of them telling her she'd have to make do with just the four of them. She may not have wanted me to watch her being fucked, her reticence didn't appear to extend to anyone else seeing her fucking. “There's plenty of black meat here for a white slut. Get down on your knees and suck my cock” one of the older men told her. She dropped to her knees and crawled over to him, took hold of his cock rubbing it over her face, smearing pre-cum on her skin. She started kissing the tip, clearly doing it willingly and enjoying what she was doing. “Just fucking suck it” he told her, grabbing her hair, pulling her head back. Her mouth opened and he shoved his cock between her lips and began to fuck her face while she gobbled his thick black cock. One of the younger guys joined in, took hold of her by the waist, lifting her to her feet still bent over sucking cock. He got behind her, bent his knees, then holding his cock rubbed it along her slit before ramming it into her cunt and began to fuck her. I leant further forward to get a better view. At that moment my phone went off. I ducked back but not before at least two had looked up and seen me. Sue being bent over sucking one cock taking another from behind was in no position to see me. I decided to leg it, the phone stopping as I climbed down the ladder. The fire door next to it slammed back before I reached the ground. The two guys, still naked, waiting for me. “Get down here you fucking pervert” one shouted. I had little choice, dropped to the ground, started trying to explain that Sue was my wife. They told me to “Shut the fuck up” grabbed my arm and led me into the building. Sue I suppose looked mildly surprised her eyes opening wide, but not remotely guilty or embarrassed. She kept sucking, letting the guy continue to fuck her, listening to them describe me as the wanking perve who'd been spying on them. Only then did she stop sucking the guys cock. “That wankers my husband” she told them, before turning to look at me, “You wanted to watch me being fucked. Now's your chance. Sit over there out of the way” They let me go and pushed me towards a chair by the door. I sat, gob smacked, unable to think rationally, watching as she took the guys thick cock back in her mouth and continued to suck him, as if I wasn't there. I could hear her gobbling him, slurping on his cock. The body of the guy fucking her, smacked against her arse, his heavy bollocks slapping her cunt and clit with each fierce thrust. Next to them the two guys who'd caught me were stroking their pricks waiting their turn to fuck Sue. The guy she was sucking began fucking her mouth faster then came. She didn't spit it out and bollock him for cumming in her mouth like she does when I don't pull out quickly enough. She swilled his spunk around her mouth savouring it before swallowing and licking her lips. She asked the other two if they wanted her to suck them off. They said they didn't and that seeing as I was there I might as well see what a slut I was married too and they'd give her one of the “specials” she was always asking for. She grinned, looked at me “You'll enjoy that, all most as much as me” she giggled, wiggling her bum, urging the guy to fuck her harder and cum in her cunt. He seemed to be on no hurry, ramming his cock in and out of her slutty cunt, forcing is cock into her hard and deep. She was squealing like a pig, urging him to cum inside her, climaxing as she took his spunk. She hung onto a workbench, still bent over, copious amounts of spunk pouring from her cunt, some running down her legs, more dangling from her hole, stretching forming a spunk string before dripping on the floor. She raised her head, turning to look over at the other two, “Come on then. Andy's been wanting to see me being fucked for ages” then turning to look at me “Haven't you?” My mouth opened and closed, finally I spluttered “Yes, But” before she interrupted. “Andy. Shut the fuck up. This was your idea. It's what you wanted. It's to late to change your mind. Now come on you two, the lady wants cock” They picked her up and carried her over to an old sofa against the wall. The guy who'd just fucked her pulled me to my feet picked up the chair and moved it next to the sofa, telling me I’d have a much clearer view of Sue taking their black meat. One sat on the sofa, leaning back, stroking his cock, holding it steady. Sue turned her back to him and bent over letting him finger her cunt, smearing her juices around her hole and between her legs, his hand disappearing between her buttocks. The other one shoved his cock in her face and she sucked until the other guy smacked her hard on the bum. A signal he was ready. She backed towards him bending her knees, lowering herself onto his cock. It slid into her pussy, she took his length, moving up and down two or three times before lifting herself off and adjusting her position. Even then I didn't realise what she was doing until she lowered herself again. The guy grabbed her bum cheeks and spread them, she reached between her legs, wrapped her fingers around his shaft and sank down. His cock missed her cunt and it finally dawned on me what she was doing. I couldn't see his fingers, but guess he was helping her take his cock in her arse. She groaned loudly, rocking back and fore, sinking a little lower each time, the guy lifting his arse of the sofa pushing against her anal resistance. With surprising ease, for someone who had never even let me touch her bum hole, let alone fuck her arse, his cock slid into her and she lowered herself onto it until he'd fully penetrated her. It was plain even to me that this wasn't the first time she'd been arse fucked, she was well practised and obviously enjoying it. She began to move up and down, his cock sliding in and out of her, while she fingered herself. She lay back against the guys chest, spread her legs wide, showing me her anus, stretched tightly around his thick black cock. The leaning back wasn't for my benefit though. The other guy got between her legs. She stopped fingering herself, reached for his cock and guided it into her waiting cunt. They both started to fuck her, when they pulled half out of her, I could see both her holes stretched around their cocks before they rammed back inside her willing and receptive body. They fucked her hard, and encouraged by her roughly, taking turns to slam their cocks into her. She kept on urging them on, shouting, and squealing, grunting and moaning, repeatedly demanding they cum inside her. She orgasmed three, maybe four times at one point I think she came in waves, shaking and shuddering for one or two minutes, or so it seemed to me. I'm not sure how long they fucked her for, 10 maybe 15 minutes, perhaps longer. Finally she took another load of spunk in her cunt. He pulled out, the other guy fucked her up the arse, with her enthusiastically riding him for another 2 or 3 minutes until he started to jerk, ejaculating in her bum. She sat with his cock inside her, a satisfied smile on her face. I wasn't sure what to do or say. Finally I asked if she was ready to go home. She told me to go home and she'd be back some time in the morning, she had a party to go to and more cocks to satisfy her. That was the start of my initiation of ultimately becoming a cuckold and in time a cocksucking cuck. That I think is another story.