Sex stories

Sex stories




Sexual Studies Ch. 02

Sorry for the delay on getting this chapter out. I've been working on it on and off since the last one was published. It's a little long, but I hope you enjoy it. If you have ideas for more experiments, send them my way. I have a few ideas, but I'd love to hear more.

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About a week after the initial exam, I got a response from the Sexual Studies department. Here's what it said:

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Hello Samantha,

I'm emailing to notify you that we've completed the processing of your initial examination. Your results came back clean, and you are cleared for participation in our studies.

Our researchers have reviewed your file and decided on an appropriate first experiment. Unfortunately, we can't give you any details about the experiment, in order to keep it un-biased. The payment will be $200, plus a one-time $50 bonus for the initial examination. You will receive payment upon completion of your portion of the experiment.

If you agree to participation in this study, let us know, and we'll add you to the list. The reference number for this experiment is EXP-05634.

Thank you for your participation.

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I read over the email a few times, to make sure I didn't miss any important details. There wasn't much information there to help me decide whether I'd be willing to participate. The only information I really had was that I'd be paid $250 upon completion. That would definitely help catch me up on my rent. I didn't have to think too hard, and within an hour of receiving the email, I replied that I'd participate.

A couple hours later, I received another email with the time of the experiment. It was the following day from 7:00-9:00pm. A little late, but since I lived on campus, it wasn't a problem.

Since I didn't know any details about the experiment, I didn't know what to expect. I decided to wear similar clothing to my initial exam: sweatpants, a tank-top, no bra, and red cheeky panties.

I arrived at the Sexual Studies department at 6:58. The waiting room was empty, except for the receptionist, Natalie. As I approached her, she said they were expecting me. The experiment was already prepped, and she'd walk me back to the exam room.

I followed her through the door, and down the hallway beyond. We didn't see anyone. A short walk later, we arrived at exam room A. She left me to enter on my own, and returned toward the front desk, while I stepped inside the room.

Exam room A was similar to the one I had my initial exam in. It had desks with computer monitors, and posters on the walls. However, this room was a bit larger than the last, and instead of having a separate room, the exam chair was in the center of the room. It was the same design as the last chair, with the spreadable legrests and contoured shape. I also saw several cameras placed throughout the room, mostly pointing at the chair from various angles, including from below.

"Hi Samantha," said a man as I entered. He was dressed in a lab coat, and looked like a researcher. In addition to him, there was another man and a woman. All three of them appeared to be in their mid-30s. "I'm glad you could join us for this experiment. My name is Jonathan, and I'll be the lead researcher for this experiment. This other gentleman is Greg, and this lovely lady is Georgina. They'll be assisting me today."

They both smiled and waved at me.

"Whenever you're ready, Samantha, please remove all your clothing and take a seat in the chair, so we can begin."

I nodded and looked around. There weren't any curtains in this room, so I went to a nearby corner, and faced away from the researchers. I kicked off my flip-flops, then hesitated briefly, before grabbing the bottom of my tank top and pulling it over my head. I then quickly pushed my sweats and panties down my legs.

I turned around, and saw that none of the three researchers had paid me any mind. They were all focused on the computer monitors, and adjusting certain things. I didn't surprise me that they were interested, considering the area of research they were in.

I walked over to the chair and took a seat, placing my legs on the legrests.

"Good," said Jonathan. "As you already know from the initial exam, this chair is specially designed to facilitate our experiments. In order to reduce the chance of misalignment, we require that you be strapped into the chair. I'll do that now."

Like David did in the initial exam, Jonathan produced some leather straps, and attached my ankles to the legrests. Then, he had me lie my arms next to me, and strapped those in place as well. Finally, he attached one long strap around my chest, just above my breasts. At this point, no matter what I tried, I couldn't move more than an inch in any directionl. My body was theirs.

"Good, you're doing excellent Samantha," said Jonathan when he'd finished tightening the last strap. "Now, I'm going to move the chair into position. Don't be alarmed."

He stepped to the side with the controls, and I felt the chair start to move. First, my legs started spreading, then the chair reclined. Just like the last time, when it was finished moving, my pussy was spread wide open, ready to receive anything and everything.

"Excellent. We're almost ready to begin. The last requirement is that you be blind and deaf for the entirety of the experiment. In order to do that, you'll need to wear a blindfold and noise-cancelling headphones." Jonathan produced a black nightmask from somewhere nearby, and slid it over my head, but not over my eyes yet. Then he grabbed a large pair of headphones, and placed them over my head as well. "Good. Now, at certain points, I'll need to convey information to you, and receive a response from you. At those moments, I'll speak through a microphone into your headphones. Understand?" I nodded. "Good. I'll cover your eyes and ears now."

Jonathan pulled the blindfold over my eyes first. As soon as he did, all light was blocked out. It was as if I had just stepped into a deep cave. A moment later, I felt the headphones slide over my ears, then I heard a click, and all noise shut off as well.

As I laid there in the dark silence, I wondered for a moment if this is what Helen Keller felt like her entire life. The only senses I still had were my smell, taste, and touch. It was somewhat disorienting. Of course, the difference was Helen Keller didn't spend her time strapped naked to a chair, with her legs wide open, waiting to be fucked. Too bad for her. ;)

After an eternity of waiting, something finally happened. I felt some movement between my legs. I could feel the chair moving slightly. Then something touched my pussy, for the briefest moment. It felt like the tip of a cock. Then it was gone, and the movement stopped.

A few seconds later, I felt a hand touch my pussy, and spread something all over it. After the outside was coated, two fingers of the hand entered my pussy and coated the inside, fingering me several times. Then the hand was gone.

A few seconds later, I heard Jonathan's voice through the headphones, "Alright, Samantha, we're all set to begin the experiment. For the next 30 minutes, you will be penetrated by several different objects. Just relax, and pay attention to how each one feels. Between each object, I'll tell you a number. corresponding to the following object. At the end of the 30 minutes, I'll be asking you several questions about each object, and how they relate to one-another. Pay close attention to how each object feels. Understand?" I nodded my head. "Good. If you need anything, call out for one of the researchers to get our attention. Here we go. The first object is number 1."

Then the sound cut out, leaving me in silence again. A few seconds later, I felt the tip of an object at the entrance of my pussy. It almost immediately entered me. Due to the lubricant the scientist had put on (and in) my pussy, it slid deep inside, with no trouble, making me feel quite full. I also noticed that I could feel what felt like skin, pressed against my thighs. Then the object pulled back out. Then back in. It started slow, fucking me at a steady pace. After a short time of steady fucking, the pace increased. At this point, I was starting to enjoy the feeling. After a short fucking, the object slid all the way out.

A few seconds later, Jonathan came on and said, "Alright. Here comes number 2."

Again, I felt an object touch me, then slide inside me. This one was warmer than the last, for sure, but roughly the same size as the last. This time, there was no slow period. Instead, it skipped right to fucking me quick and hard. With each thrust, I gasped. This object was slightly longer than the last. Like the first object, this one pressed against the inside of my thighs when it was all the way in. The fast, hard fucking continued for a while (about half the time as the first), then the object was pulled all the way out, leaving me wanting more.

"Object 3," I heard Jonathan say.

The next object was inserted into my pussy. It felt wider than the first two, but a bit shorter. At full insertion, it was about half as long as the first. It also had a different texture than the first two; somewhat spiny. This time, when the object was all the way in, there was nothing pressing against my thighs. This object fucked me for roughly the same amount as the last, then it slid out.

"Alright, Samantha. Short break, then object 4."

As I lied there, waiting to be fucked again, I thought about my situation: I was science's whore. I was strapped to a table, being fucked by unknown objects, putting up no resistance. Thinking about the situation made me a little uncomfortable, but I'd made an agreement with the scientists. They could use my body in any way that they liked, in exchange for their money. I knew I wouldn't get paid until I'd finished the experiment. I couldn't back out now. Besides, I didn't really want to.

My thoughts were suddenly interrupted by another object entering my hole. I gasped from the surprise, since Jonathan didn't say anything.

"Oh, sorry about that. This is object number 4."

As the object slid in, I noticed it was colder than the previous three. It was also around the same length as the first two. When it was all the way in, I once again felt something flesh-like press against my thighs. It fucked me at a steady pace for a short time, then pulled out.

After a few seconds, Jonathan told me object 5 was coming, and another object was shoved inside me. This object felt warm and long. I could tell that when it was in as far as it would go, it wasn't the whole length of the object. This object continued fucking me for a good long time, then just when I was getting close to cumming, it pulled out. I sighed in frustration.

"Two objects to go, Samantha. You're doing great. Here comes object 6."

As this one slid in, it felt curved. Instead of sliding straight into me, it curved up and pushed against the top of my vagina. This one wasn't very long, it wasn't warm, and nothing pressed against my thighs. After a short, unpleasing fuck, it pulled out.

"Last object Samantha. Number 7."

A moment later, I felt the object touch my pussy. All the others had quickly been inserted into me, but this one took it's time. It slowly rubbed against my outer lips, touching my clit. Finally, when it had teased me enough, it slid slowly inside me. It went deeper and deeper, until finally it stopped. I felt warm flesh against my thighs, as well as something else; I couldn't quite tell what it was. Then I felt the object start vibrating. A moment later, the object started rapidly fucking me. It started soft, then increased intensity as it went on. This object fucked me longer than all the other objects. It also got me the closest to cumming, but once again, just before I was pushed over the edge, it was pulled out of me.

"Excellent, Samantha," said Jonathan. "That's it for the first round. You're at the 30 minute mark of the experiment, which means you're a quarter of the way through. You'll get a short break in just a moment, but first, as I said earlier, I have some questions for you.

"First, please rank the objects in order of how much you enjoyed them, starting with the most enjoyable."

"Um...Well, 7 was definitely the best. Followed by 5. 6 was the worst. 3 was slightly better than that. Then 2,4,1 is the order of the last three."

"Alright, so that'd be 7-5-2-4-1-3-6. Next question. Which ones felt the most life-like?"

"Hmm." I thought about it for a few seconds before responding. "2, and 5." Had those been real human dicks? Thinking back, the scientists had never actually said the objects weren't real.

"Good. Now, I'm going to lower the chair, then remove your blindfold and headphones. You'll have about five minutes to stretch your legs and have some water before we continue on to part two."

I felt the chair start to move, and my legs started lowering and coming back together. When the chair stopped, I felt the headphones removed, and suddenly I could hear all the subtle noises in the room; the AC running, the whirring of fans on the computers, the breathing of the researchers.

Then the blindfold was removed. It took a moment for my eyes to adjust to the bright light in the room. When I wasn't blinded anymore, I saw Jonathan standing in front of me, smiling. Behind him, I saw the other two researchers typing away at the computers. Above them I saw a clock, which read 7:32.

"Now, I'll just remove these restraints," said Jonathan as he knelt down and undid my chest, arm, and leg straps. "Alright. If you'd like some water, there's a water fountain just down the hall to the right. At this time, there shouldn't be anyone in the halls, so don't bother getting dressed."

I stepped out of the chair, and started walking toward the door. My legs felt a little tense from the roughly 30 minutes that they had been spread. Also, my pussy was a little raw, from the nearly-constant pounding it had taken. I wasn't sure if my body could take another hour and a half of this.

I walked through the doorway and looked down the hall in both directions, and saw nobody. I turned to the right, and saw the water fountain, about 30 feet down the hall. I walked to it, bent over, and took a drink.

As I drank, I heard voices nearby; I couldn't make out their words, but I could tell it was a few people. First, a male saying something, then a mix of male and female laughter. I looked around but couldn't quite tell where it was coming from. I decided it wasn't important, so I walked back down the hall, and into Exam Room B.

I had a few more minutes to rest before we continued, so I walked around and looked at some of the posters on the walls. The first one I saw was a detailed diagram of an erect male penis. Each part of the penis was labeled. The next poster was a vagina with a dick inside. It had some text about the average depth each vagina could hold (~7 inches). The last poster was a chart of about 30 different sex positions.

"Alright, Samantha," I heard Jonathan say. "We're ready to begin part two of the experiment. Go ahead and take a seat, and I'll strap you back in."

I did as I was told, lying back in the chair. Jonathan started with the strap around my chest, then added another around my waist.

Next, Jonathan started on my legs. However, this time he did something a little different. Instead of simply strapping my ankles down, he attached a piece to the legrests, so that there was a solid piece in front of my shins. As I wiggled my ankles, I noticed they were a little looser than the straps from before, but I still wouldn't be able to remove them.

When Jonathan was done with my leg restraints, he told me he'd be strapping my arms in a different way this time. Then he reached to one side of the chair, and raised a piece I hadn't noticed before. It raised up like an armrest, except it came up higher. When it was completely extended, it was above me, in front of my face. Then Jonathan went to the other side, and raised another one. Jonathan then had me raise my arms, and place my forearms against the new pieces, then he strapped them there. When he was done, it was almost like I was in a defensive boxing position, except that I was lying on my back.

"Excellent, Samantha," he said, as he stepped back to admire his work. "Now I'll put the blindfold and headphones back on." He did as he said, once again submerging me into utter darkness and silence.

A moment later, I heard his voice in my ears. "Alright Samantha. We're ready to get you into position. In a moment, I'll start moving the chair. We'll start by putting you in the same position as last time."

Like before, I felt the chair spread my legs, and soon my pussy was wide open, and my legs were raised. However, this time my legs were at about 90 degrees to my torso, instead of being raised towards my chest like before.

"Good, Samatha," I heard Jonathan say in my ears. "Now, the chair is going to continue moving, putting you in a new position."

As I lied there waiting for the chair to move, I wondered what the new position would be. From what I had seen of the chair, it looked fairly versatile, but I wasn't really sure what it was capable of. I didn't have to wonder for long, because a few seconds later, it started moving. I felt the whole chair raise up, so I was higher off the ground. Then it stopped, and started to tilt forward. It wasn't like a car seat, where just the back tilts; it was the entire chair, including the seat. It was like I was slowly being spun forward.

It kept going, and eventually, I felt my weight shift so that I was no longer lying on my back. Instead, my weight was resting on my arms and my shins. The chair continued moving beyond the point I thought it was capable of, and soon I felt my hair move to dangle below me. Then I felt the chair lower again, so I moved toward the floor. Then all movement stopped.

I wasn't sure how the chair managed it, but in the final position, I was on my arms and knees. I was in the doggy position!

"You're doing great, Samantha. Now, we're ready to begin the experiment. Just like before, we will be inserting various objects into you. These are the same objects as before, but in a different order. Pay attention to how each one feels, and like last time, I will be asking you a series of questions at the end. Additionally, I will ask you to match up the objects from this set with the objects from the last set. Understand?" I nodded. "Ok. Here we go. This round, I will simply let you know when a new object is about to start. Here comes the first object."

A moment later, I felt some movement behind me. Then I felt the first object touch me. It was cold. It rubbed against my pussy for a moment, then entered me. It felt different than the last experiment, because of the angle, but I was sure this was number 4. It was the only object last time that was this cold. I felt it fuck me slowly for a moment, then it sped up. After a few minutes, the object pulled out.

A moment later I heard Jonathan say, "Here comes the next object, Samantha."

A few seconds later, I felt another object touch the inside of my thigh. Then I felt it line up with my hole. But it was the wrong hole! I felt the object press into my asshole, and I let out a gasp. It slid in a few inches, before quickly pulling all the way out. Then I heard Jonathan's voice say "Sorry about that Samantha. There was some confusion on our end. That won't happen again. Here comes the same object, but in the correct location."

A moment later, I felt the object line up with my pussy, and slowly slid inside. It went deep. I could quickly tell this was the long object. It got as deep as it could, and I felt very full. I was very glad that it hadn't gone that far into my ass. Then it pulled most of the way out, then thrust into me hard. It proceeded to fuck me fast and hard for the next few minutes. It felt so good, I noticed I was trying to thrust back into it, but the restraints prevented me. After a good long fuck, the object pulled out, and I felt very empty, and somewhat dissatisfied, because I hadn't cum.
"Alright, Samantha. Here comes the next object."

I felt it at the entrance of my pussy, then it slid in. I didn't feel any warmth as it slid in. I also noticed it curved down toward the floor, rubbing against the inside of my pussy, right where my g-spot was. As it fucked me, it wasn't very enjoyable, but I did like that it was rubbing my g-spot. Finally, it slid out.

"Next object."

It entered me almost immediately after Jonathan said that. It was wide, and had bumps all along it. At full length, it wasn't very long. The fuck wasn't great, but by now, I was very horny, so I enjoyed all the objects. Also, I still hadn't felt the best one from last time: number 7. I was looking forward to it. After a minute or so, this object pulled out.

"Three more, Samantha. You're doing great. Here comes the next one."

Unlike the last few, I felt this one slap against my pussy lips first, which surprised me. I jumped a little, but not much because of the restraints. The object slapped me a few times, before touching my hole. It taunted me for a moment, and I knew this was the one I had been waiting for. I would enjoy this.

The object taunted me for a good 30 seconds or so, then finally, it surprised me and slid deep inside my pussy. I let out a gasp, which was probably fairly loud, but I couldn't hear it with the headphones. The object then fucked me hard and fast for a little while, and I couldn't hold it back any longer; each thrust let out a moan from my mouth. As the object fucked me hard from behind, I could feel myself getting closer and closer. Then it pulled out. I couldn't stand it, so I yelled out, "please, don't stop!".

Then I remembered where I was. I was in a science lab, held in place by a strang chair, being fucked from behind by who-knows-what, while 3 scientists watched. I blushed a bit at the fact that I was enjoying it, and I had just let all three of them know.

However, it seemed my wish was granted, because a moment later, I felt the same object slide back into me. It continued fucking me, and it felt better than ever. I didn't care that there were three people (basically strangers) watching. I let them know I enjoyed every moment of it, by making lots of noises. Finally, I received what I so desired, and the object pushed me over the edge, into the ecstasy of my first orgasm of the day. I screamed several times from the waves of pleasure. Then it pulled out.

After a few seconds for me to catch my breath, I heard Jonathan again, "Alright, Samantha. Here comes the next one."

I felt the next object press into me. It slid in all the way, then out. It continued fucking me at a steady, constant pace. I was fairly sure this one was a machine, but I couldn't be certain. Then I felt something I hadn't noticed before. Something was slapping against my pussy lips at the depth of each thrust. Were those balls? I concentrated on them for a moment, but I couldn't be sure. Then the object slid out of me, leaving me wondering.

"Last object"

Once again, I felt something touch the entrance of my pussy, spreading my lips. It slid in, and went all the way to it's depth. If I hadn't been told it was a different object, I would have thought the last object had just pulled out, and been reinserted. It felt identical to the last one.Then it sped up. Since it was so similar to the last one, I was left pondering the same question: something was slapping against my lips. What was it? Unlike the last object, this wasn't a light touch; it was hardcore slapping against my pussy. I was 90% sure these were balls slapping against me. Did they make dildos like that?

After an eternity of slapping and pounding, it pulled out. I heard Jonathan say "Great, Samantha. All done with this part of the experiment. I'll flip the chair over now, and unstrap you." I felt the chair start tilting back, and soon I was lying on my back. Then my legs were lowered, and I felt halfway decent for the first time in about half an hour. The headphones were removed, then the blindfold. As my eyes adjusted to the light, Jonathan undid my restraints.

"You did excellent, Samantha. Now, as I said, I have some questions, like last time.

"First question: order each object again on enjoyability."

"The first object was cold, but it wasn't too bad. The second was better than the first, and definitely much longer. The third was probably the worst, followed by the next one. The fifth was definitely the best, as you already know. The last two were about equal, with the final one being slightly better. So that would be 5-2-1-7-6-4-3"

"Great. Next question, I would like you to guess which object from the second group matched up to the objects in the first group."

"Well, I'm sure the one that made me cum - Er, number 4 in this group, was number 7 in the first group. The cold one was the same. That'd be the first in this group, and 4 in the last group. I believe the last one was second last time, and the one before it was first, maybe. The second one - the really long one - was fifth? maybe? The last two, I'm not really sure. One was curved, and I could feel the curve in both, but I can't remember which one that was in the first group."

"Excellent, Samantha. You matched them all perfectly. Alright, last question: Overall, which position was more pleasurable for you? On your back, or on your knees?"

I thought about it for a brief moment. "The first position was definitely more comfortable, because I was on my back rather than my arms and knees. But I still think the second was more pleasurable."

"Why?"

"Well, I liked the angle better, and I was already worked up, and of course I came."

"Okay, great. All done with this phase. If you'd like to grab another drink, feel free. Then we'll start the next phase."

Oh, god, I thought. Another phase? What position would they fuck me in this time? I thought about all the positions I'd ever been fucked in before, and which ones they might choose. Meanwhile, I walked down the hall to the water fountain again. As I sipped water, I heard the voices again.

When I returned to the room Jonathan instructed me to sit back in the chair. Then he strapped my ankles and chest in, just like the first phase, as well as one arm. He left the other arm unstrapped.

"Alright Samantha. Time for the blindfold and headphones." He placed them over my head once again.

"Ok. In this phase, we will not be penetrating you." I had mixed feelings about that: relief and disappointment. "Instead, we'll be testing your manual tactile accuracy. In laymen's terms, that means you'll be feeling the objects with your hand. The order of the objects has been changed again, but it's the same seven objects. I'll let you know each time there's a new object. While the object is in your hand, I'll ask you which number it is, and what you believe the object is. Do you understand?" I nodded once again. "Good. Alright, let's begin. Please raise your hand and the first object will be placed in it."

I did as Jonathan said, raising my hand and opening it, palm up. A moment later, I felt the object placed in my hand. I felt it for a few seconds, and determined it was definitely a banana. I could feel the curve of it, and the stem. I told Jonathan that it was number 6, and it was a banana. Then it was removed from my hand.

"Alright. Here's the next object."

Again, this one only took me a short time to determine it was a cucumber. I could feel the bumps along the length of it. I told him, and it was removed.

"Next object."

The object was placed in my hand, and I could tell it was the cold object I'd felt before, so I told Jonathan it was number 4. I rubbed it for a few seconds before I realized it was a cock! I was giving someone a handjob right now. I rubbed a little faster, and felt the cock twitch a little, and I knew for sure. I told Jonathan, and it was removed from my hand.

"Next object"

I felt a long hard object placed in my hand. The shape of it felt like a dick, but it didn't give in to my touch nearly as much. It felt like it was made of silicon. It must be a dildo. I felt up it's length once, then said "It's a dildo. Maybe number 1?" Then it was removed from my hand.

"Next object"

Another warm object was placed in my hand. I realized after a bit of rubbing, it was definitely another cock. I told Jonathan. I rubbed down the shaft, until I got to his balls. As I felt them, I realized they were quite large. This must have been the one slapping against me. I told Jonathan it was number 2. Then the cock was removed from my hand.

"Next object."

This object was the longest one I had felt so far. It was warm. Oh my god! It was another cock! That's three cocks that had been inside me, twice each, in under an hour! I felt somewhat violated, but then I thought about it for a moment. I knew from the start that it was going to happen eventually. Why not get it over with in my first experiment. After that thought, it turned me on a lot.

When my thoughts returned to the cock in my hand, I felt all along it's length. This was definitely the long object. It must have been a good 8 inches or so. Wow! I told Jonathan it was number 5 and it was a long cock. Then it was removed from my hand.

"Last object"

This object was another silicon dildo. I told Jonathan that. I realized it felt much the same as one of the cocks; the one with the large balls. I rubbed it for a few seconds, but I couldn't decide whether it was 7 or 1. I told Jonathan 7, then it was removed from my hand.

"Alright Samantha. That's all seven objects. We're done with phase 3. Now, I'm going to remove your blindfold and headphones, but before I do, I want to explain the next phase. When your blindfold and headphones are removed, you'll see the seven objects in front of you. Your task is to match up each object with it's corresponding number. Understand?" I nodded. "Good. I'll remove your blindfold and headphones now."

First the headphones came off, then the blindfold. I waited for my eyes to adjust, then looked forward. In front of me, I saw four naked people. The first on the left was a white guy who was about my age (19) holding a banana. Looking down, I saw he had an average sized cock. Next, an older man (maybe 35?) holding a cucumber. He was quite pale, and his cock was also about average size. Next, another young man (24ish?), black this time, holding a pink dildo, with a massive cock dangling in front of him. And finally, on the far right, there was a white girl (20ish), with B-cups. She was wearing a black strap-on dildo.

I realized had been fucked by these four people for a little more than an hour, while the researchers watched. I also thought about the fact that this was the first time I'd had sex with a black guy, or with a girl. All of those facts made me very wet.

"Alright, Samantha." I heard Jonathan say, "Please match the objects in front of you with the objects you have felt and been penetrated by."

"Well, I know the banana in the first guy's hand is number 6. And the cucumber in the second guy's hand is 3."

"Okay, please continue."

"I'm pretty sure number 5 is the third man's cock."

"Why do you say that?"

I blushed and said, "Because it's the longest object, and number 5 couldn't fit all the way inside me."

"Good observation. Please continue."

I looked at the other two guys, but couldn't see either of their balls. "Can the first and second guys please move their shafts so I can see their balls?"

"Sure. Go ahead, guys," said Jonathan.

The first and second guys grabbed their cocks and moved them aside. I immediately got my answer. "The first guy's cock is number 2. I know it because his I could feel his balls slapping against me when he fucked me from behind."

"Alright. That leaves numbers 1, 4, and 7."

"I'm going to guess that number 4 is the second guy's cock. He looks pale, so maybe he's cold, too. Now, this decision is a little harder for me. Both of the last two objects were dildos for sure. I guess I'd have to say number 7 was the girl's strapon, because she probably knows how to please a girl. That leaves number 1 as the dildo in the third guy's hand."

"Excellent, Samantha. You got them all correct! Now, we have two more phase to this experiment. In order to make sure we finish in time, you won't be allowed to get up between the two phases. Would you like to get some water before we continue?" I shook my head. "Alright. Then I'll go ahead and strap you in again."

As Jonathan strapped down my free arm, I wondered what could be left for the experiment. I knew which object was which now, so there couldn't be anything more about that, could there? Once again, Jonathan blindfolded me and put the headphones back on, leaving me wondering what would happen.

"Alright, Samantha. For this next part, you get a choice. Would you rather be in the position from the first phase, or the second phase?"

I thought about it a moment. I liked both positions. The first one was more comfortable because I was on my back, and it felt more natural, but I definitely liked being pounded from behind as well.

"I'll go with the second position, please." I told Jonathan.

"Alright" I heard. Then I felt Jonathan raise the shin rests and then he unstrapped my arms and attached them to the arm rests. Then I felt the chair start to move again. It lifted and spread my legs, then tilted forward, just like before. Soon, I was on my knees once again.

"Good. Now, for this phase, the other participants are going to take turns putting the objects in your pussy, in a random, possibly repeating order. Each time something enters you, we need you to tell us which object you believe it is. Okay?" I nodded. "Good. This time I won't be telling you when a new object is coming, so I don't bias your answer. Each time an object is pulled out of you, and another is put in, we'll need an answer from you. Here we go."

A moment later, I felt the first object. It slid inside me from behind. Now that I knew what the objects were, it was fairly easy to tell that this was the girl with the strap-on. I let her fuck me for about a minute before telling Jonathan my answer.

For the next 15 minutes or so, the four people fucked me with each of the seven objects. I lost track of how many times they entered me, at about 8; it must have been close to 20. Sometimes I'd know instantly which object it was. That was certainly true for the banana and the cucumber. It was also true for the girl with the strap-on. But the other objects took me a bit of time to tell the difference. I usually knew when it was a real cock, but it took me a little bit to determine which one. And that dildo felt so real! I'm sure I slipped up a few times in my guesses.

In that 15 minutes, I came twice. I didn't know which object it was either time. The first time, I knew it was a dildo, but I wasn't sure if it was the girl's strapon, or the the guy fucking me with the pink didlo. The second time, I'm fairly sure it was a real cock, but I didn't know which one.

When the continual fucking stopped, Jonathan said to me, "Alright Samantha. Final phase. During this phase, We'll need you to keep your mouth open. I'll tell you two objects, and they'll both be inserted into you; one in your vagina, one in your mouth. They'll continue for 30 seconds, then both pull out, and I'll ask you which was which. Understand?" I nodded, and opened my mouth. "Excellent. In order to help you, I'll give you the names of the four participants. From left to right from earlier, they are Stephen, Frank, Jamal, and Ashley.

"Alright, the first two objects are the Jamal with the dildo and the Ashley with the strap-on."

I felt two objects approach me at either end. First, one slid into my pussy, then the other slid into my mouth. The one in my mouth was quite long, and didn't hesitate to push into my throat. I gagged a bit, because I wasn't used to deepthroating. I'd done it before, but only once. They both thrust into me for the next 30 seconds, then pulled out.

"Okay, Samantha. Which was which?"

"The one in my mouth was Ashley. The one in my pussy was Jamal with the dildo."

"Correct. Next up, we have Stephen and Frank's cocks."

I felt them approach, and they both entered me at about the same time. It took me a little bit to figure out which was which, because it was a little difficult to pay attention to one at a time, with them both thrusting in and out of me. Finally, I had a guess, and they pulled out.

"Frank was in my mouth, and Stephen was in my pussy."

"I'm sorry, but that's not correct. Stephen was in your mouth, and Frank was in your pussy.

"Next, we have the cucumber, and Jamal's cock."

Both of them were very wide, but as soon as they were all the way in, I could tell Jamal's cock was in my pussy; it didn't feel like he was all the way in. Also, I could taste the cucumber in my mouth. They fucked me for a while, then pulled out. I gave Jonathan my answer, and he told me I was correct.

Various combinations of objects continued double-fucking me, for the next fifteen minutes or so. Sometimes there was a cock in both holes, sometimes a dildo in one, and a cock in the other. Although I only got about half of the combinations correct, I enjoyed every single one. However, I didn't cum, until the very last one.

"Alright, Samantha. This will be the last combination of the evening, and then you may go home. For this combination, we will have all four of the other participants involved. Two will be in your hands, and the other two will be in your mouth and pussy. Also, they will continue until all five of you have cum."

First, two cocks were placed in my hands. The third cock cock slide into my mouth, and the strapon slid into my pussy. Then I felt 8 hands touch me in many places. I was having sensory overload from all things going on; there were a total of 12 things moving around my body. I felt my tits and nipples get rubbed, my hair getting pulled, my hips getting grabbed, my mouth and pussy getting fucked, and my hands rubbing cocks. Wow! And it all felt amazing!

It continued like that for a good 5 minutes or so, but I knew it wouldn't last. The guys would reach their limits soon. Sure enough, a couple moments after I thought that, I felt the cock in my right hand start twitching, and I felt hot cum all over my tits. Almost at the same time, I felt the cock in my left hand start, and it landed on my face. When they're loads were spent, they pulled back, and I was left with the cock in my mouth, the strapon in my pussy, and hands on my head and hips.

Now that there was less going on, I could easily tell it was Jamal in my mouth, from the length. He lasted quite a bit longer than the other two, but after a few more minutes, he came as well, and I felt the hot salty cum in my mouth, and I swallowed all that I could. Then he pulled out.

Now, it was just Ashley and I left, racing to see who would cum first. She was thrusting in and out of me so fast at this point. It felt amazing. Another minute or two, and I felt my orgasm coming. I started moaning and then screaming, and finally I came. Ashley continued fucking me through the whole thing.

Between the first exam and this exam, I'd had the best three orgasms of my entire life!

Now that I was spent, the only one left was Ashley. She continued fucking me for about a minute, but it seemed that wasn't doing the job, because she pulled out. Next thing I knew, I felt a pussy placed in my right hand. After a moment to realize what she wanted, I slid my fingers inside her and started fingering her. She fucked my hand for a couple minutes, then pulled off.

Then I felt her pelvis against my face. I hadn't noticed before with the strapon, but I was very glad her pussy was cleanly shaved. I opened my mouth, and started eating her out. Her juices leaked all over my face, and it felt and tasted great. After a few minutes of that, I could tell she was finally getting close. Her body started to tremble, and finally, she pressed hard into my face, and I could feel her pussy clench and unclench with her orgasm. Then she pulled away.
Once again, I was left there, naked, unable to move. I was sure the other participants were getting cleaned up now, but Jonathan took his time getting to me. I could feel the cum and pussy juice dripping from my face and my tits, and I could taste it in my mouth.

If there was any doubt before about me being their whore, it was gone from my mind now. The other participants, on behalf of the scientists, had just used my body for a full two hours, in almost every way I could think of. I should have felt violated and objectified, but I didn't. I simply felt amazing. I was content to continue in this role for as long as they needed, and do anything they said. Consciously, I still had certain reservations, but in the back of my mind, I knew if they asked me to do something, I would agree to it.

Finally, a couple minutes after Ashley pulled away from me, I heard Jonathan's voice in my ears, "Alright, Samantha, we're ready to get you out of the chair now." I felt my body start to move again. "Sorry about the wait. We wanted to get the other participants exit survey's done. They've now cleaned up and left. There was no reason to waste their time with your final questions."

After a few seconds, I was lying on my back again. Jonathan removed the blindfold, headphones, and restraints. He handed me a towel to clean myself off, but asked me to remain seated.

"Alright, Samantha. We have a few more questions, and then you're free to go.

"First, on a scale from 1 to 10, how much would you say you enjoyed today's experiment?"

"10" I answered instantly, with a smile.

"Great!" he said, noting that down on his clipboard. "Overall, what aspect of the experiment made it so enjoyable?"

I did think about that for a moment before answering. "I'd say there were a few things that really helped. Firstly, I liked the objects. When I signed up, I wasn't sure how I'd feel about a few things like sex with girls, and with multiple people, but those turned out to be one of my favorite parts of it. Another thing was that I had no control over the situation at all. As weird as it sounds, I really enjoyed not knowing what was about to happen, and that even if I did, I couldn't really do anything about it."

"Excellent," he said, taking more notes. "We'll be sure to include those things in your later experiments. We want to make sure you're enjoying them as much as possible, so that you'll continue your participation. One of our biggest problems is retention of participants. Many people do one experiment, then decide not to continue. So, because of that, one of our top priorities is keeping you enjoying it."

I thought about what he said, and I was glad to hear he was taking my feelings about all this into account. However, I knew the way the research system worked at the university. If they didn't get results from their experiments, their funding would be cut. So, if it came down to losing a participant, I'm sure they'd be fine with it, as long as they got their results.

"Alright, that's the last of the questions we have about this experiment. Now that you've completed your first experiment, we want to give you the opportunity to change the preferences you have listed. If you feel like there's anything that you agreed to before, now's the time to say so, and you can remove that consent."

"Well, I don't really think I want to remove consent. I'm fine with what I've agreed to. However, if I can, I'd like to add more things to my consent list, if that's alright?"

"Wow! I've never been asked that before. Yes, we can certainly add additional items." He consulted the forms on his clipboard. "It looks like the only thing you didn't consent to before was anal intercourse."

"Yes. That's what I'd like to add back. During today's experiment, there was that brief mistake, and one of the objects went inside the wrong hole briefly. Well, surprisingly, it actually felt kinda good. I'd like to try it again."

"Alright, I'll change your answer to yes on that. That means you've consented to everything, correct?"

I nodded.

"Alright. You'll receive an email from us within the next week or so, with information about the next experiment. You're free to go. You may get dressed here. Natalie's gone for the night, but I believe she's left an envelope on her desk with your name on it. That contains your payment. After you grab that, you let yourself out."

I stood up, grabbed my clothes from nearby, pulled them on, and walked out. I grabbed my payment from the front desk, and left.

As I walked home, and until I received the next email, I couldn't stop thinking about the experiment. It was the best sexual experience I'd ever had, and I couldn't wait for the next experiment. I didn't know what it would involve, but I knew I'd like it.

studies   sexual  

Feb 15, 2018 in bdsm

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