My girlfriend, who everybody calls Silky, is a night animal. During the day she is a normal respectable 28 year old woman, with a responsible job. Come the night time she turns into cum sucking, cock fucking nymphomaniac. I discovered that shortly after I met her. She told me that she had a calling, as she called it, to service many cocks. She also told me that if I didn't like it to leave. The first few nights we stayed in and made love on her bed for long periods. Then on the third night she told me that she had to go out and I could go with her if I wanted, but she would be fuck someone else that night. We went to a local pub and Silky joined in with a group of men playing pool. As she took her shots and she bent over the table, her white panties were clearly visible under her short skirt, and I spotted several men knocking and nudging others to make sure they all saw her cameltoe trying to break through the flimsy covering. After a couple of games and several drinks she went to the toilets. She was gone a long time and I went to see if she was ok. I knocked on the Ladies door with no reply. I was also in need of the toilets so decided whilst there I would make use of the gents. I opened the door and entered. Silky was bent over holding onto a sink, with a cock in her mouth and an even bigger cock plowing her fanny. The guy being given head cum and shot the lot into Silky's mouth. The man stepped away and before the next one stepped up Silky spotted me and just smiled. Then she was sucking another cock. The man screwing my girlfriend came and just tucked his softening cock into his trousers and left. The guy getting a blow job took the mans position and just slammed straight into Silky's fanny and pumped away until he came. He quickly left, leaving just Silky and I in the room. "Do you want a go or do you want to wait til we get home?" she asked. I told her I would wait and then struggled to pee as my cock had started to stiffen. Silky went back to the pool table and played a few more games. Then she decided that she wanted to go home. I went to get our coats as Silky was already on her way out to my car. I got outside to find Silky on her knees, next to my car, sucking another cock. He didn't last long and Silky swallowed the lot. To my knowledge Silky had sucked three cocks and was fucked by two of them. Once in doors, Silky told me she had a good night and tried to kiss me. I pulled away as I had seen her suck three cocks and swallowed the load from two of them. Silky told me to get used to it as she had no intention of changing her ways. She kissed me and forced her tongue in my mouth. I couldn't actually taste anything different. We ended up in bed screwing for the next hour. This continued every three or four days, with Silky sucking and fucking every cock available on the nights she had her calling. She was running out of new pubs and clubs to meet new men. She even picked up two men in Tesco's and fucked them in the toilets. Even the men at the Chippie were not safe. I tried scouring the internet about women like Silky and her calling, but kept ending up at dogging sites. It seemed to be just what Silky needed. I found a fairly local site and visited it a few times to check out what times they seemed to meet and what the crack was. There were two regular women. One would select a couple of cocks to suck and then leave. the other woman seemed to let the men fuck her face and fanny as they wished, until they had all finished. Neither were anywhere as good looking as Silky, but ok. I made a plan, Silky's birthday was in just over a weeks time. Silky's birthday evening came. I dressed her in a very short skirt, a blouse that was two sizes too small and a pair of high heels, but no panties. Then I applied a blindfold and steered her out the house and into the car. Silky was very excited and was chatting away trying to get me to tell her where we were going and what we were going to do. I refused to answer either question. We arrived at the dogging site and I got Silky out the car and bent her over holding onto the bonnet of the car. As you can imagine, it was like bees around the honey pot. The men seemed to appear from everywhere. The first two were within a few feet and I nodded approval. Then one was behind her stuffing his cock into Silky's fanny. She squealed with delight. It didn't last long as her mouth was quickly filled by the second man's cock. I had taken a thick blanket and spread it out on the strip of grass which was behind the cars. the man with his cock in Silky lifted her up still on his cock and staggered to the blanket and bent her over and then lowered her to the blanket. Silky was now on her hands and knees. the man behind her never lost contact with her fanny. Quite impressive I thought. He pounded her fanny until he came deep inside Silky's fanny. There was now ten men around her, and her second cock filled her fanny whilst she sucked on one and wanked a third. The woman that usually fucked and sucked everything in sight arrived and was not impressed that she didn't have her usual following queued up for her favors. She came to see who was getting her share of the cock. One of the men decided he was not willing to wait for his turn with Silky and undressed the woman and pushed her onto Silky's blanket and banged his cock into her. By now Silky was on her back. The man fucking Silky's fanny came and moved away. Her fanny was oozing her juices with even more spunk. There was a few flashes from men taking photos on their phones. "Look at that filthy bitch's spunked up fanny," one of the men declared. Then one of the men said it needed cleaning before he was going to put his cock in her. I thought that one of the men would clean her fanny. Before anyone was able to oblige a man grabbed the woman saying, " Get on and lick that fanny and don't stop Marion until we tell you to, " as he pushed her face into Silky's fanny. I could hear her slurping at Silky's fanny and Silky squealing at Marion's tongue and mouth all over over fanny. The guy was still fucking Marion and Silky was still sucking and wanking other cocks. The numbers of men seemed to be swelling and I guessed it was now up to about fifteen. Marion was moved out the way and Silky was lifted and lowered onto her back on top of the cock of a man laid on the blanket. Silky yelped as the cock penetrated her arse hole, then settled as she got used to it in her butt. A second man lifted her legs and thrust his cock into Silky's fanny. She now had cocks in all holes and two more in her hands. Marion not to be outdone climbed onto a man who was on his back. She was in the cowgirl position, and another man mounted her from behind and slipped his cock into her arse, while another stuck his cock into Marion's mouth. Between the two of them they were servicing eight men out of the fifteen still stood around. "Fuck me, those two are suck fuck sluts. I wouldn't like to see my missus like that," a man declared. "Well don't look when she comes again next week," another dug at him. "I'll take pictures for you if you like," said another. Most of the men laughed. Then there was a change around as several of the men had come. Marion had cum all over her arse and on her face and in her hair. Silky had spunk on her stomach. She had managed to swallow most of the spunk in her mouth with just a trickle running down her chin. The next group of men were soon in place and being either sucked or fucked. I tried to count how many men had been sucked by Silky and how many had fucked her. I lost count and then remembered that I had intended to take some photos. I rushed to get my camera from the car as the next batch of men were settling her on a new cock up her arse and another in her fanny. Then she greedily swallowed a third one. I rattled off lots of photos as she was being totally fucked in all holes again. Eventually as they came most of them put their cocks away and let. Eventually we were down to Silky fucking one and sucking a second. The same was happening to Marion. Then a car tore into the carpark and the man ran over and warned us that the police were at a dogging site about two miles further along the road and would be here shortly. The man in Silky's mouth pulled out and ran to his car. The one in Silky's pussy gave three hard thrusts and shot his bolt. I quickly got Silky into the car and covered her with the blanket over her in the back seat. The men on Marion had also bailed out and bolted. Marion looked shocked and scared as she grabbed her clothes and dressed. She had been dropped off, and her ride was not due back for at least another half an hour. I told her to get in and she jumped in the back seats under the blanket with Silky and we also bolted from the carpark. Back at Silky's house the women were giggling at what had happened. Silky had removed her blind fold and was kissing with Marion. We got indoors and the women decided if they couldn't finish off with the men, then I was going to have to service both of them. I was quickly stripped by the two of them and Marion was sucking my cock whilst Silky forced her fanny onto my unwilling face and mouth. I had no option but to open my mouth to grab gulps of air and without meaning to, mouthfuls of other men's spunk. I must have been hard enough as Marion was trying to force my cock into her sloppy fanny. It slipped in, hardly touching the sides. Marion came fairly quickly, but with so little friction on my cock I was still hard. Silky soon took advantage of that and as she did so Marion took Silky's place and sat on my face and I was forced into a second load of fanny juice and men,s spunk in my mouth and over my face. Both women were groaning their approaching orgasms When I came, Silky followed me and shuddered her way through her orgasm. About a minute I guessed that Marion had also cum, as she flooded my face with her juices and what was left over from the men's spunk. We ended up in bed and I went to sleep leaving Silky and Marion sucking pussy. In the morning Silky kissed me saying it was her best birthday ever. I gave her the present that I was meant to give her the night before. She kissed me still tasting of Marion's fanny. Marion got up and then made a call and was collected ten minutes later. Silky asked had I enjoyed it. I told her that I had enjoyed watching her and enjoyed fucking the two of them, but was not keen on mouthfuls of other men's spunk. Silky just said, "Get used to it."