3 comments/ 17396 views/ 15 favorites The Scientific Experiment By: TobyTyke In the interests of science! The agency had telephoned and given me the address of the local University. I was to attend at 10.00 a.m. on Tuesday. There was nothing really unusual in that appointment as I was quite often used as a nude model by students on various arts courses. However, I didn't recognise the name of the Professor I was to make contact with and it was in a different building to where I was used to going. Still, I put these thoughts to the back of my mind as I was sure all would be revealed when I went on Tuesday, anyway, what harm could there be in a group of students looking at me? Tuesday soon came and I wondered what to wear, normally I just put on something casual as I always take my clothes off for posing and wearing anything else is pointless. As I wasn't sure who this Professor was, and I wanted to make a good impression, I decided that a short skirt with hold-ups and high heels would be quite cool. I also wore a fairly tight top to both show off my breasts and to hold them firm without a bra. Looking in the mirror, my first thought was that I looked like a tart, but yet I still felt comfortable that the Professor would be impressed, even though I know from previous experience that academics seem fairly sexless creatures. Arriving at the University I parked as close as I could to the building on the card and walked across the open space in front of the other buildings. Even though I'm in my late 30's and students are half my age, I certainly attracted plenty of attention, even to a whistle or two!! Now, when did I last get whistled at by a 20 year old? Does wonders for your self esteem, and was corroboration that the outfit was eye catching at least. I reached the building and went inside to the information desk. Presenting my card I asked for directions to the correct department. "Oh, Human Biology," the receptionist said. "3rd floor, turn right out of the lift and it's about halfway down the corridor on the right hand side. I'll telephone ahead and say you're coming. What's your name?" I gave the girl my name and headed for the lifts. "Human Biology" I said to myself, that's a curious one, not Arts as previously. Perhaps I was to be used as a live model for the class, surely they didn't need me for that, as I was sure that 20 year old students would know all about that and what a woman looked like. Anyway, "in for a penny, in for a pound," I thought as I entered the lift. My fees were being paid so why worry? The lift stopped and I got out, turning right as the girl had said, towards the Department of Human Biology. The corridor was quite long and through several doors. However, I soon reached my destination and was just about to knock on the door when it opened. A man appeared, fairly young with a brown jacket, open necked shirt and jeans, not the usual 'professor' type at all. "Are you Nicola?" he asked. I nodded and he went on "pop into my office a moment, I want to explain what is happening today." He guided me across the corridor and into a small room full of books and papers, with no apparent place to sit. He apologised and moving some papers about revealed an old broken chair. "Please sit down," he said. I was a bit wary of the chair but he assured me it was quite safe. Being a fairly low chair and wearing a short skirt I was conscious of showing rather a large amount of leg. It didn't go unnoticed, as it was several seconds before he made eye contact with me again. Clearing his throat he said "did the agency explain what we need today?" "They said nothing to me, just sent me a card with your name and appointment details. I didn't even know it was this department," I answered. "Oh," he said "I thought, because of the way you are dressed you were properly briefed." He coughed again and hesitated before saying "err, well, err, erm, its, ...well, I'm running a sex education class at the moment and I asked for an experienced woman who would be prepared to act out a live demonstration to the students." It was me that hesitated now before saying "you mean to have sex in front of a class? Are they all male or a mixture?" I asked. "They are male and female, probably about half and half. I have 18 in the group and they have all attended today." "Now there's a surprise" I said laughing, "presumably they all knew what today's seminar was about?" "It has been discussed for several weeks now and they made the point that it would become much more 'real' if it could be a live act and not just discussion or videos. That way they could ask questions and get parts repeated if necessary." This all sounded quite incredible, I hadn't ever thought of myself as a scientific experiment before. "Why did you comment about the way I was dressed?" I asked. "Oh," he replied, "it's just that I asked the agency for a sexy woman who could come dressed as though she was attracting the opposite sex, in a 'sexy' way. You seem to have done that admirably." I was flattered, (I think), by his remark and smiled before saying "OK, so tell me what you want me to do." "You are going to come into the room, walk around a little, showing off yourself and then sit perched on one of the bar stools we have obtained, in front of the class. I am then going to chat you up and let it develop from there." "I have one BIG question" I said, "Am I going to be fucked?" I'm sure I saw him blush before he managed to stammer "err, I had hoped to do that myself." Now I looked at him differently before saying "you mean you can fuck me in front of the class and the University doesn't mind?" He blushed again before replying, "err, well, I haven't actually asked them. It's our own initiative and one that the class have fully supported." "I bet they have," I said laughing. "Do any of them get the chance to fuck me too?" This stopped him in his tracks and I could see that this situation had not been discussed. "If one of them wanted to, in the interest of science, would you be willing?" he asked. Now I'm not sure what other ladies would have said, but the thought of being fucked by young 20 year old students really excited me and without hesitating I said "the more the merrier." He was totally confused now and before he could say anything else I said "if that's all, let's go in and I'll strut my stuff for you." "Oh, right," he said and taking my arm helped me up from the chair. "I'll lead and you can follow. Just wait a few moments and then enter, walking around before taking your place on the stool." I didn't answer, just followed him out of the door. "Can I tell the class your name?" he asked. "Sure", I replied, "let's keep it friendly and informative." He went into the classroom and closed the door behind him. I heard him clear his throat and say; "OK, class, I have a lady outside who is going to help us with our experiment today. Her name is Nicola and she has been briefed on what we require. She is very sexy and seems to have no objection to anything we want to ask or do, so without further delay I'll get her in." He walked to the door and opening it beckoned me inside. I did as I had been told and slowly moved around in front of them all, wriggling my bum and smiling. It was a mixed bunch but they were all attentive, both boys and girls. After a few moments I made my way to the stool the Prof had described and wriggled up on to it. It was quite high and my skirt pulled back as I settled on top. During my walk around I had noticed a bed at the back of the room, covered with a large fluffy duvet, no doubt that's where the actual 'experiments' would take place. I was perched on the stool now and heard the Professor say "OK, class, how would you start a conversation if this lady was in a bar and you fancied her?" No-one said a thing -- stony silence! "Come on, you wanted this experiment so make it happen." One of the students suddenly said "can I buy you a drink ma'am?" I laughed at this and said "sure you can buy me a drink but for goodness sake don't call me ma'am!" "What should I call, you?" he asked. "You could ask my name first and then offer to buy me a drink. You already know my name so how about, Oh hi Nicola, my name's xxx and I'd like to buy you a drink." This seemed to break the ice and he asked the question much more confidently. I told him that a gin and slim-line tonic would be nice. "Do you want ice?" he asked. This was better, he was actually thinking through the situation. "Yes please," I replied and he ordered the drink from an imaginary barman. After a couple of moments I said "Thank you," and holding up the imaginary glass said "cheers." "Cheers," he replied before saying "so Nicola, what brings you in here tonight?" I thought for a moment as to just how suggestive I might be on a first meeting with a young male and said "well it's one of those places where I don't feel threatened and can enjoy a drink without being hassled." "Oh" he said "am I hassling you?" I laughed and said, "not at all, you're nice and I already have a free drink." Before he could say anything else another guy asked "are you happy at the bar or would you like to move to a table and the comfy chairs?" I told him that it would be better there and looked that the Professor to see what I should do now. He didn't answer but just waived to the side of the room where there were two low chairs and a little coffee table. I hadn't noticed them before but presumed that the Professor had already thought this process through quite well. I wriggled off the stool, exposing the tops of my stockings, and moved across to one of the chairs. Sitting down the Professor joined me on the other chair. This was weird, the students were asking the questions and he was doing the actions. "Is that better," the voice asked? "Yeah, much", I replied. As the chair was so low my knees were pushed up and my skirt struggled to cover my thighs. This had not gone unnoticed by the Professor or the people in the class. "Great legs," another voice said. "Thank you" I answered, wriggling even more to expose my bare thighs. A girl's voice this time, "Do you prefer hold-ups to tights or stockings?" "Every time" I answered, "one they're less trouble to hold up, two they don't leave nasty lumps in my skirt, three it's easier to pee and four they're easy to remove. "What do you prefer?" Silence, wasn't I supposed to ask questions I wondered? After a few moments the Professor said "this is an interactive session, that means we have two-way communication". The girl's voice said "I don't wear either as a rule, prefer to keep my legs tanned." "So, what about panties"? I asked. A short silence followed and then "usually a thong or sometimes Commando." I saw all the guys look round at her now, no doubt wondering that she was wearing today. "What about your panties?" she asked me. "Same as you" I replied, "and before you ask, today I'm Commando". The men all looked back at me now, knowing that at the top of the bare thigh I was showing there was nothing else between that and my pussy. "So tell me, when you go out for a drink do you always dress so provocatively?" asked another male voice. "Do you think I am dressed provocatively?" I asked. The voice answered, "definitely, I'm sure no 'real' man would not notice you in a bar looking like that." "Why thank you kind Sir" I replied. Another voice, "would you like another drink?" "Yes, please" I answered, "make it a double." "A double?" said the voice. "Sure" I said, "it's been ages since the last one and I have only limited drinking time. Anyway you don't mind do you?" Short delay and then "Oh no not at all, I'll fetch them." A student pretended to put drinks on the table and I said "thanks". It was obvious that if sex was going to happen we would be there all day and I wondered how to move it on a bit. I needn't have worried, the Professor had it under control. "OK" he said "we've been here a couple of hours now, had quite a few drinks and it is obvious that there is some attraction between the lady and the man. What happens next?" I heard a voice ask "do you fuck on the first date?" The class gasped and the Professor was quite taken aback. "Would anyone ever use that line?" he asked the class. The guy assured us that he often used it in the clubs to save wasting time with women that only wanted free drinks all night. That generated quite a disturbance as the girls were objecting and the guys were congratulating him on his honesty. The Professor interjected and said to me "would you answer a question like that?" I thought for a few moments and said "yes I would fuck on the first date. Whether I actually answered the question at that time would depend on what I wanted from the evening. If I fancied him and didn't want to waste time then I would tell him the truth. If I didn't fancy him I would use it as an excuse to become indignant and get rid of him." "OK," said the Professor, "if the answer is yes, what next?" "I have a room here with a big double bed" I heard a voice say. "Nice, is that an invitation to visit?" I asked. "Yes please" said the voice. "We'd better not be seen going up together then as someone may comment" I said, "what is the room number and I'll join you in about ten minutes." "402," the voice said. At this point the Professor got up and went over to where the bed was. Some of the class turned round, others were still watching me. The Professor asked for volunteers to move the bed to the front -- there was no shortage of volunteers! I waited a few moments and moved to where the bed was now and pretended to knock on the door. A voice said "come in," I moved a few steps and stood, looking at the bed. A voice again said "would you like a glass of wine, I have some cooling in the mini-bar?" "That would be lovely" I answered, taking the imaginary glass. "Come and sit down on the bed, it's much more comfortable" the voice said. The Professor sat down and I sat next to him. "Cheers" I said tipping the glass towards him. "Cheers" a voice replied. "Can I take your jacket?" a voiced asked. "Thanks" I said "taking it off and putting it on the floor. "Wow" said another voice, "great breasts." "Thanks" I said, kicking off my heels. "they are killing me". "Anything else you want to remove?" asked another voice. "This is all a bit one way" I said, "aren't you taking your jacket and shoes off too?" The Professor didn't say anything but looking at the class they all agreed by nodding their heads, so he also removed his jacket and shoes. "It's your turn to lead now" I said, "so show me something else." Without much hesitation he removed his pants and sat there in only his shirt and boxers. There's one thing that lycra boxers don't hide and that's an erection, me and the class could see he had a beauty! "What's that in there?" I asked cheekily, looking straight at his crotch. A voice at the back said "a big cock, wanna see it?" I smiled and said "OH YES please, that's what I came up here for." The Professor stood up and slipped out of his pants, the girls in the class gasped as his cock was exposed. It really was a beauty, at least 8" long and really thick. Already I was getting wet thinking about it entering my pussy. "Your turn now" said the voice again, "let's see those lovely breasts." Without hesitation I slipped the top over my head and exposed my 38DD chest. Another gasp from around the room, I guessed from the guys, but who knows! I was getting quite excited now and I could see that the Professor liked what he saw as his cock was still rising. Reaching over I undid the buttons on his shirt, "Come on Prof" I said "don't be shy." I heard some of the class giggling as I removed his shirt. He certainly wasn't built like a teacher, more like a body builder so I guessed he must work out. This time a girls voice was heard saying, "stand up Professor, let's see that cock of yours ready for action." The Professor smiled and stood up, his cock standing up like a thick, pink flag-pole. He was uncut and the crown was just peeping out as the erection forced his skin back off the end. "Skirt off and show us your pussy" a male voice said. I stood up and unfastened my skirt, before sliding it down to my ankles and kicking it away. Turning round I faced the class, my bush glistening with the dampness from my wet pussy. I stood legs apart and looked around the room, several of the men had their cocks out and some of the girls had their hands up their skirts. "this is going to be fun" I thought. At last the Professor spoke, "OK Class, gather round the bed and watch as the act of sexual penetration takes place. Take note of the wetness in the vagina and the puffiness of the labia. See how the penis is erect and hard, the blood having been pumped into it as a result of the sexual arousal." The class couldn't have got there any quicker if they had tried, boys and girls jostling for a good view. The professor laid me on the bed with my legs wide open. "Feel how soft and wet that labia is" he said. I suddenly had what seemed like dozens of fingers poking me and rubbing my lips and clit. Now feel just how erect the penis is, it's only filled with blood but under intense pressure, which makes it very hard. This was quite amusing, as none of the boys grasped it but most of the girls were soon holding and stroking it. As they did the foreskin slid back and revealed the dark purple crown. Looking down he said "that colouring is the blood inside. The helmet, or crown as it is sometimes called, is the most sensitive part of the penis and the act of sliding in and out of a vagina makes it more aroused until the testicles release their semen, which flows up the shaft and inside the woman. Once inside they swim up the fallopian tubes to the ovary and try to fertilise the eggs. There are millions of sperm as they aren't very good swimmers and very few, if any, will make it." All the time he had been talking, two of the girls had kept playing with his cock and I could see the effect it was having on him. Looking at their faces I could see the effect it was having on them too, as their eyes were glazed and their lips slightly parted. Perhaps they too would get his cock in their vaginas later! "One aspect we haven't discussed yet is foreplay," said the Professor, "who wants to give us some ideas or examples of foreplay." One of the two girls asked "on you Sir or Nicola?" "Oh both" he said, "foreplay is never supposed to be only one-sided." At that point I felt my legs being opened and one of the students was heading down to my pussy with his tongue already out. As I glanced at the Professor I saw one of the girls sink to her knees and take his cock in her mouth. "That's good" said the Professor, "normally the man would lick the woman and the woman would suck the man. In this experiment I want you all to experience the various aspects involved ....." His voice sort of trailed off as the girl was working on his penis with some obvious expertise and he was having all on to contain himself. The male working my pussy was also not short of experience as he had opened my lips and was pushing his tongue inside. Another one was rubbing my clit while a third was sucking my nipple. I reached out and rubbed my hand on the front of the jeans of the lad nearest to me and could feel he had a sizeable erection already. I tried to undo his belt but with only one hand it was impossible. However, he got the message and soon had his jeans and pants off with his erect cock only a few inches from my face. Leaning over I took it in my mouth, sucking hard on it as I pulled it inside, my tongue flicking around the end and into his slit. I was on fire now, my pussy was so wet it was drowning and I so much wanted to be fucked. I wondered just how many cocks I was going to get today. In my mind I calculated that there were 9/10 guys, some would probably be gay but hopefully, including the Professor I may end up with 8!! The Scientific Experiment I could see that the Professor couldn't hold out much longer now and he slipped his cock out of the girl's mouth. Moving the two boys away from my pussy he climbed on to the bed, placing himself inside my thighs with his hot erect cock just touching my wet pussy. "Now class, this is called the Missionary Position where the woman is subservient and the male is dominant. Later on I will show you other positions for penetration but we will start with probably the oldest and most often used position." "Later on" I thought, this was going to be good. He went on, "it doesn't take much force to push inside as the woman is consenting and sexually aroused. What this means is that the lips of her labia are soft and the muscles around the mouth of the vagina are already relaxed and she has also created quite a lot of secretion for natural lubrication. Our friend's saliva will also have helped there" he said smiling. "However, if you are having sexual intercourse with someone who is a bit nervous or very tight, there are some excellent lubricants you can use to aid penetration. Make sure it is a lubricant especially produced for sexual penetration and not baby oil, Vaseline or other such substances." Without saying anything else he suddenly drove his big cock into me. It took me by surprise and I gasped a little as it pushed its way deep inside me. He didn't stop but pushed until his pelvic bone was crushing my clit and then he ground his hips to push it hard against me. Other men had their pants off now and several were wanking as they watched us. I saw at least one girl with a cock in her mouth too. "This wasn't a lesson, this was a bloody orgy" I thought. The Professor was really working me now, fucking as hard as he could until I could feel his cock stiffening and his back arching. Without saying anything he suddenly pulled out and squirted his sperm all over my belly. There was loads of it and it took his cock several minutes before it stopped throbbing. "That's what semen looks like" he said, "if you want to taste it you will find it is not unpleasant, just a bit salty." At least four of the girls ran their fingers through it and put them in their mouths. Another, the one who had been sucking his cock, leant down and licked up the rest, looking up at the Professor and smiling at him when she had finished. The professor's cock was limp now and several of the girls looked disappointed. "This is where women score points" I said. "The man can't come again for some time, until his balls refill, but we women can come again and again." I didn't like to mention that I hadn't actually come yet! "so if any of you students want to experience sexual penetration feel free to climb on and fuck me." The guy who's cock I had been sucking earlier was first to react and he was soon sliding his cock into me. It felt a good size, not as big as the Professor's but OK. He drove it in and out at a furious pace and soon came inside me. Still I hadn't had an orgasm. Several of the other students were already standing naked ready to fuck me and one after another they climbed on and fucked me. At no time did I come near to an orgasm until the last man stepped forward. I hadn't noticed him before but he was black and his cock was at least 10" long and nearly as thick as my wrist. "Maybe now I would climax" I remember thinking. I could see that several of the girls had glazed expressions as they watched him climb on to the bed. Forcing my legs even wider he slid between my thighs and with his hand positioned his big, black cock against my dripping pussy. Smiling down at me he suddenly thrust his hips and drove that huge member into me. "Oh my God" I screamed as it forced my pussy open. In all my years of fucking I had never had anything as big as this before. Despite my screaming, he didn't stop but just kept thrusting it in as far as he could. I could feel it against my cervix now and still he kept pushing. My pussy was stretching wider as his cock got even bigger as he thrust it into me. My head was swimming now and I was on a cloud of ecstasy as my pussy throbbed with pleasure. With a huge groan he thrust into me one last time and that's when I erupted, my pussy flooding with his cum and my own. I heard myself shouting "OH YES, OH YES" and felt the cum running out of me like a river. I couldn't remember when I had last had such an orgasm. He pulled his cock out and thrust it at my face. "lick it bitch" he said and I took it straight in my mouth, sucking on it like someone demented. I felt my pussy being licked too and wondered just who wanted our cum. Squinting past I saw that it was the same girl who had licked me up before. She was obviously a cock sucker and would be a great fuck I was sure. Now the Professor said "well class, you have seen the basic sexual act. Do any of you have any questions?" "The semen loving female asked "you explained that this was the missionary position, what other positions are there?" "Oh, lots", the Professor replied "sex is only limited by our imaginations. One position that has become quite a favourite is 'Doggy' where the female is taken from behind. It doesn't get quite as much penetration as this position but leaves the clitoris free for masturbation at the same time as intercourse and also helps the man to hit her 'G' spot". "Oooh" said the girl "can you demonstrate that on me? I don't think I know what the 'G' spot is" The Professor seemed a bit taken aback by the question but I could tell from his already hardening cock that he rather liked the idea. "Do you want a break Nicola" he asked, looking at me. "Sure" I said "I think I can find someone to look after me". At that I got off the bed, now quite wet with semen and stood up. The girl who had asked the question, sat on the side and asked "do I get undressed or what Professor?" "Of course" answered the Professor, "take off your clothes and kneel on the bed for me." She did as he had said and I noticed just how firm she was, about a size 10/12 I thought with lovely firm tits. The Professor got on the bed behind her and opened her legs wider before rubbing his fingers up and down the lips of her pussy. "As I mentioned before" he said "it's important to arouse the female so that she secrets lubricant to make sure that penetration can be achieved without difficulty." I could see that the girl was already wet, as could all the class who were peering at her wet pussy already. The Professor was now fully erect and one of the girls took hold of his cock before saying "don't you want arousing Professor?" She stroked it a little before taking hold of the foreskin and sliding it back from the head, exposing once again that hot purple crown. The Professor smiled at her and asked her, "would like also like to participate". She said "yes" almost before he had finished asking the question. "We can get more than one couple on this bed if we turn across" he said, "take off your clothes and let one of the other men here follow my lead in the sexual act in the doggy style. The black guy was there in a flash and helping her out of her clothes. She was quite tiny and I wondered how on earth she was going to take that huge cock of his. She also knelt on the bed and he bent down and started to lick her pussy, rubbing her clit at the same time, his huge cock growing larger all the time. I looked at it and knew I wanted it again and moving over to him started to rub his balls in my fingers. Bending down my tongue started tracing patterns around his bum hole. I was fully exposed and was enjoying the taste of his bum as a felt someone coming up behind me and without any warning I felt a cock sliding up my pussy. One of the students was fucking me now. He was quite a nice size as my pussy was getting well serviced but didn't last long before he came, to be replaced by another student. Meanwhile, the black guy was moving in between the small girl's legs and guiding his big black cock into her. To the right, the Professor was banging away at the first girl and I noticed that in front of her was a student who was trying to get his cock into her mouth. I was watching the petite girl now as that black cock disappeared inside her, I only wished I could see her face but I was being fucked by the sixth or seventh student so was a bit tied up! The black cock was on its way out again now and then it was disappearing inside her again. I could see that he was taking it easy with her so presumed that she must be quite tight. She was so tiny compared to him and as he fucked her from behind he seemed to completely engulf her, each time getting further and further inside. I stopped sucking his balls and looked at the Professor who had finished now and was turning away from the girl, who was now sucking the guys cock like a toffee apple at the fun fair. She was still in doggy position with her little bum and pussy open. I wanted to taste her so moved sideways to get my tongue on to her wet pussy. She sighed as I licked her and my fingers rubbed her clitoris, which was still hard from the earlier fucking. Suddenly I heard the petite girl cry out and looking sideways could see the big black guy shuddering as his cock discharged its cum deep inside her. What a waste I thought, I wanted that! There was no-one fucking me now and I stood up to survey the scene around me. Two girls were playing with each other on a rug at the side, two were kneeling on the bed and the other three were being fucked by other students in a variety of positions, with one on the edge of a desk her legs wrapped around a guys waist. It was quite obvious to anyone that the sex experiment had been a great success and all the students had comfortably passed the practical assignment. "Time to get dressed," I thought looking around for the small amount of clothing I had brought with me. I found them scattered around and gathering them together moved to one side to put them on. Most of the others had finished now, the two girls on the bed had been left by the guys and were kissing and cuddling each other before moving into the 69 position. The Professor seeing this said, "that's a classical position called '69' where the head of each is on the genitals of the other. It can be either sex as each can easily arouse the other. It is a favourite piece of foreplay and has the added advantage of naturally lubricating the genitals ready for sexual intercourse." I was quite amazed, nothing seemed to faze this guy and even though he was stark naked, with his limp cock hanging down, he still maintained that authoritative style. I was dressed now and told him that my time was up. "No problem" he said "it's lunchtime now anyway. Can I call on you again for my other groups if we decide to repeat this style of tuition?" "Most certainly Prof" I said, "anytime you need a good fuck, just give me a call". Within about 2 seconds max, many pairs of hands were thrusting paper at me, "write your number on this" they said. I laughed and told them that the Professor already had it and if he felt that any of them needed any extra curricular tuition I was sure he would pass it on. With that comment I moved to the door and the Professor asked if I would be able to find my way back to reception. I assured him I was fine and after blowing a kiss to all the class, opened the door and stepped into the corridor. I was quite sore and walking was a little uncomfortable as I headed for the lift. Arriving at reception and handing back my badge the young lady asked "has it been a successful morning?" "Oh yes," I replied "very satisfying" and with that comment left the building to go home.