The experiment.

“I’m sorry it took so...” I tried to say, but I was halted in my tracks when I entered the dim-lit room.

Sophia was lying on the ground, in all her superb glory, heaving loud, breathing in and out. Not only in full arousal, but also tied up. Four steel rods were driven into the ground, right through the carpet, Sophia was bound to them spread-eagle. A marvelous sight to behold, but I saw small beads of sweat on her forehead, dripping into her eyebrows.

Around her were sitting my other four beautiful girlfriends, all in bras and panties, smiling broadly, like they had the fun of their lives, clearly tormenting Sophia into multiple orgasms. Or was I mistaken? Kara had a feather in her hand, slightly caressing Sophia’s clit with it.

That wouldn’t make her orgasm. They were...

“Edging her?” I frowned.

“Ah, you have arrived, professor. We were waiting on you. Yes, we were edging her a bit to make her come fully in the mood, professor. All ready for the experiment now, professor.” Kylie said, eagerly to please me.

Oh... Right, four eager assistants, trying to please me to ensure ‘the experiment’ would work. The experiment on a willing test subject to have multiple orgasms in succession to exhaust her completely. I needed to get into my role quickly, so I took upon the role, slightly different from a previous one, the teacher with the stern manners.

“I see...” I frowned. “Eager as you all are, you forgot to take into account the effect of such edging on a test subject like her. She may come too fast and too hard for her first time. It will dilute the validity of the experiment.”

“Oh... so sorry, professor.” Kate apologized, looked even sad when she said so.

“So, remove that feather, assistant Kara.”

“Yes, professor.”

“Let her calm down a bit.” I was getting into my role more enthusiastically now.

“While we do that, let’s go over the experiment one more time before we begin. First, do we have the full consent of the test subject to proceed?” I looked at Sophia.

“Yes... you... have,... professor.” She barely managed it to give it, but her determination made it a full consent.

“Good. Now, I see you prepared her, she will not escape our attentions. But eh... When she will resist them, she could start screaming... the whole building could get.. eh... distressed.”

“Already thought of that, professor.” Kylie showed me a BDSM ball-gag.

Oh... Right. From the raid...

“She also could.. eh... release...”

“Yes, professor, we have plenty of towels ready to be soaked, professor.” Kara showed.

“Excellent, but eh... do we have also the extra... eh... tools for the experiment?”

“We do, professor, we have a few dildo’s prepared in a few shapes and formats.” Ella showed me the lubricated dildo’s, indeed in a few shapes and...

“Are you sure these are not too big?”

“We asked the test subject to choose, professor.” Ella answered eagerly.

“Well done, assistant Ella.” She beamed at my compliment, real or not.

“Now, preparation is one thing, how to execute is another. Do we know her erogenous zones well enough?”

“The test subject clearly stated that she has more than one. She can get aroused by touching her breasts, her clitoris, her g-spot inside the vagina, her anal ring, her inner thighs, her earlobes, her upper thighs, her...” Kylie was going through the entire list and knowing Sophia a bit, she may be sensitive all over her body once she got aroused.

“Plenty to choose from then... I see. Is she sensitive to images, fantasies, certain auditive stimuli too?”

A rhetorical question as she said to get aroused by me getting busy with my other girlfriends. She loved watching. But I was getting hard, my bulge was clearly visible to all through my pants. I even had to readjust my package.

They are eager, alright.

“Professor, shouldn’t you change your outfit too, to not be contaminated by the test subject?” Ella asked, innocently smiling.

As if having less clothing would help with that...

“You are correct, assistant Ella.”

So I undressed myself, methodically, folding my clots neatly on top of each other, in full view of Sophia and the others. Sophia’s head lay on a thick cushion, so she didn’t even need to strain her neck to watch me undress. She unvoluntary licked her own lips when she saw me standing naked in front of her.

“Later... perhaps, test subject Sophia.” I teased her, resulting in a small moan from her.

She was calm now, well, calm enough. But also a very willing test subject. Perhaps if I didn’t start, her first one would be less strong?

“Right, who wants to start the experiment?” I asked while sitting next to Sophia.

“I want to, professor.” Kate was first, just before Kylie, Kara and Emma. Kara and Emma were eager too, but they were looking more to me than to Sophia at the time of my question.

“Excellent, assistant Kate, I am sure our test subject is in capable hands.”

“Very capable...” Kylie murmured.

And indeed she was. Stimulating Sophia with one hand, fingers in her slit, her thumb on her clit, slightly caressing, slightly moving in and out. Like she was still edging Sophia. Sophia didn’t like this one bit and wanted the main part fast and now.

“A bit faster and harder, I am afraid, assistant Kate, she will not enjoy edging now...”

“Yes, professor.”

I had never seen Sophia come before, but it wouldn’t take long. Her arousal levels were through the roof, anticipation of the joy was way too high. This would take a while, like an endurance training, while sprinting in between the slower runs, or slower runs between the sprinting, or just one sprint after the other. I had no idea what to expect.

Kate obeyed dutifully and was rubbing her faster and harder. Sophia’s breathing was already fast and became irregular quickly after that. She too must have realized she was in for the long haul, and came silent, but squirting a lot. She convulsed and spasmed, but had no time to rest at all. Kate was merciless now, fingering Sophia fast and hard inside on her sweet spots. Sophia came again, squirting a lot, again. Her breathing was over the top. Panting loudly, gasping loudly, but no way she had time to calm down. She was kept in her state of full arousal by Kate, differentiating now between hard and soft, slow and fast. Sophia was looking at me, looking at my erection, when she came again. Kate looked silently at Kylie, and Kylie took over, not missing a beat, I mean, not missing a rub.

She must have been very sensitive to her edging, her multiple orgasm was not ending with Kate. Kylie continued to stimulate her hard and fast, but only on her clitoris now, variating between squeezing it, rubbing alongside, on top of it. Sophia couldn’t resist the skillful ministrations of Kylie and she came for a forth time and a fifth time. But her breathing was getting... more controlled now. She tried resisting more and more. She failed when Kylie used her other hand to insert her fingers into Sophia. Rubbing alongside the ventral wall, soft first, slow first, then harder and faster. One finger, two fingers, three and then four of her fingers entered Sophia, stimulating as much surface as she could. Sophia couldn’t resist coming for sixth and seventh time. But after that she was starting to get out of breath and her silent pleas looking at me became a single plea, whispering loud:

“Please...”

Kylie stopped and simply said:

“There, all ready now... professor.”

I had heard the single plea, and I looked up at Kylie a bit worried myself.

“Don’t worry, professor. This was only her first and very long orgasm, after the edging. She isn’t used to such long orgasms. It contained a lot of mini-orgasms, though in her case, those were... let’s say, more pronounced. Over time, we will need to stimulate her more and more to elicit another one...”

“Ah...”

“She has shown she is very sensitive to... a male presence, especially from... a professor like you. That will certainly get the process going, I mean... the experiment moving forwards.” Kylie continued, a bit more difficult to stay in her role, as she was trying to put me on my ease.

“Ah... Okay then.”

I lay myself on my stomach between Sophia’s legs, allowing my head optimal access. Sophia looked at me, still breathing ragged, but the desire in her eyes was unmistakably. She was wet, incredibly wet. It seemed best to continue a bit more conventional, by teasing her into it. I lowered my head towards her pussy and simply blew over her wetness. She shivered, but not from the cold sensation. I licked her love button, gently at first, but then with gradually increasing the variations all around and upon her clitoris. It was my first act ever pleasing her, instead of Sophia pleasing me. It aroused her immensely. She enjoyed it very much and not long after I had started she came, leaving just enough time to withdraw my head from her squirting. I inserted two fingers, bent them and turned my wrist to feel her vaginal walls all around, touching her most sensitive spot every turn. I lowered my mouth upon her clit, placed my lips around trying to seal it in. I then sucked violently sealing her clit and some area around into a vacuumlike state. She responded immediately with a sharp shriek.

“It seems we need the gag already...” Kylie murmured, handing it over to Kara.

While I continued sealing it, unsealing it, Kara did her best to put the gag belt around Sophia, not too hard, leaving Sophia plenty opportunity to breathe comfortably.

But while I continued, she couldn’t breathe comfortably, she was panting loud again. My wrist suddenly upped the rhythm of its turning around. She gasped and I had to swallow still quite some squirt in the midst of sucking her. I almost coughed, but I could continue afterwards. My tongue entered the fray, sucking and licking at the same time. She couldn’t resist, but I had to swallow less of her squirting. Again, I continued. My palm now upwards, two fingers now continuously rubbing her ventral inner wall in circular motions. Alternating between pressing deep into it and softly caressing it, it felt just like my massage of Kylie’s shoulders. She couldn’t withstand the variating pressure levels onto, into her. This time there was only little fluid leaving her. I didn’t pause. I was getting into a rhythm now. My fingers no longer circulating onto her inner flesh, they entered and exited her slit, pressing deep, as if I tried to get the engorged wet tissue out of her. I failed of course, but she failed too. It took longer and longer between her orgasms as I moved in and out. Ella leaned her head lower to Kylie’s. She started whispering something in her ear. I couldn’t understand, but the effect was absolute. She came, but I had lost the count some time ago.

“Seven...” Luckily Kara was counting, whispering loud.

More fingers entered the fray, desperately trying to get the tissue out of her, but the grip was too slick, and it wasn’t meant to leave her anyway. Slower, faster and then slow and fast again.

“Eight...”

My entire repertoire was now activated. Lips, tongue, sucking, licking, even a light bite, a long blow, fingers alternating in pressure, length of rub, circulating, pausing,...

“Nine...”

I was getting tired. Well, my tongue was getting tired first. My fingers held up quite nicely, trying to push her tissue further into her, then trying to get it out.

“Ten...”

She had no squirt left, or she couldn’t produce it fast enough. I lay my head sideways on her upper thigh and faster and faster I rubbed her sponge with four fingers now. At maximum speed, for some time.

“Eleven...”

My arm was getting tired. I looked at Kate, questioningly. She grabbed one of the dildo’s, sat herself next to me and while I pulled my fingers upwards, she slowly entered it below the back of my hand. The increased pressure of my four fingers, combined with the sensation of the lifelike cock being enveloped by her vaginal sheath, slowly moving in and out of her, elicited a sharp response from Sophia, the loudest gasp, more like a cry I ever heard.

“Twelve...”

The dildo pressed against the back of my hand now, but since we couldn’t bind them together, Kate and I found our combined rhythm soon. By bending my fingers in her less or more I could alternate between the pressure upon her g-spot tissue softer and harder.

“Thirteen...”

It didn’t feel that surreal to me anymore, I was working just fine together with Kate. She too started alternating the angle of the dildo, shoving it in and out at a steady pace.

“Fourteen...”

“Please stop...”

I looked at Kylie, but she shook her head slightly, so we continued. Ella continued whispering into Sophia’s ear, perhaps something different now.

“Fifteen...”

“No...”

My tongue had rested long enough now, I thought and I lowered it to her clit once more.

“No. No... Don’t...”

I licked her button, added my saliva to her wetness. I licked and sucked it between my lips. Slow at first to get myself into it.

“Sixteen...”

Faster now, using more tongue, pressing upon it, stimulating around, variating again.

“Please stop. Please...”

I glanced at Kylie, rolled my eyes upwards looking directly at her but she still shook her head in a silent no. Almost on autopilot now, fast, slow, hard and soft. She started resisting more and more, but failed once more as I heard Kara counting;

“Seventeen...”

“Stop! Please...”

Perhaps I lost control a bit, perhaps Kate lost control a bit, but we upped the pace together.

“Please!”

“Eighteen...”

Her resistance to our combined efforts grew. Then Kylie lowered her head towards Sophia’s breasts.

“No! No, Kylie, don’t do that...”

Kylie didn’t listen to the steady pleas of Sophia. Kylie tongue touched her nipples...

“Nineteen...”

Kylie seemed an expert in this too. Licking her nipples, around it, sucking it, alternating between the two. Alternating between hand and tongue, groping, grabbing, massaging, the whole works...

“Twenty...”

Kylie bit into the nipple, pinned the other between her fingers, all the while I was still working my tongue on her clit, all the while I was still working my fingers, all the while Kate still shoved the dildo in and out of her, taking the inner labia with her movements.

“Twenty-one...”

If she had any normal breath in her, it was completely gone by now. She couldn’t calm herself. The overwhelming sensations was overloading her, she arched her spine, her ass lifted from the floor, desperately trying to escape our attentions, but at the same time, with each orgasm, she lost the will over her muscles, resulting in increased violent spasms. Kate saw her chance when Sophia once again lifted her ass from the drenched carpet. She had been repositioning herself for a while now, but now manage to get her leg underneath Sophia’s ass.

“Hold her still, will you all?” Kate asked us at a normal voice.

Ella placed a knee upon the pubic area above my head, gently at first, but then, since Sophia continued to resist with greater effort, placed more weight upon her pubic area. She had another dildo in her hand, a smaller one. One for a different purpose. She dangled in front of Sophia’s eyes. Sophia recognized it, knew at once what its purpose was.

“No, no, no... d... don’t...”

Ella gave the smaller dildo to Kate, who had succeeded switching her hands. Kara now started whispering into Sophia’s ear. Kate lowered the small dildo and despite Sophia trying to buck her hips as much as she could, she failed preventing Kate entering the anal dildo into Sophia’s anus. The effect was immediate.

“Twenty-three...”

We lowered our pace, but Kate figured out how to coordinate her arm movements, withdrawing the dildo into Sophia’s ass, entering it again, variating the angle, turning it around, stimulating the sensitive inner walls of her anus, doing the same in her vagina.

“Twenty-four...”

Ella had to increase her **** upon Sophia. She had to place a second knee upon her body onto her navel, trying her best to minimize the violent escape attempts. Sophia bit hard into her ball gag, trying to muster as much **** as she could to throw Ella off.

“Twenty-five...”

Kate found her faster rhythm, I found mine back.

Violent delights...

Ella worked her finger nails into Sophia’s side, softly, gently, not in the least hurting Sophia. But her reaction was like she was being hurt.

“Twenty-six...”

Ella showed no mercy. She clawed where she could, pain sensations overwhelmed Sophia even more, she couldn’t predict where Emma would strike next.

“Twenty-seven...”

Kara whispered still into Sophia’s ear between her counting. But she too could use her fingers. Tentatively her hand slowly caressed her upper arm, her fingers creeping to Sophia’s shaven armpit.

We will perhaps never know what caused it exactly. Was it our method of choosing to increase the level of sensation? The adding of sensation upon sensation? Was it the pleasure upon the pain upon the straining of her resistance upon the stimulation of more and more areas, upon the tickling? Suddenly she orgasmed once more. Violently, crying, yelling, gasping and panting, ragged breathing... And then she collapsed, she fell ****. Shivering, spasming, but completely out.

... have violent ends.

We ceased immediately. All of us. Each untied her. Checking her pulse and breathing. Drying her body. Warming it, keeping it warm. Half carrying her upon a mattrass. Warming her with our body heat. Kate on one side, me on her other side, blanket upon blanket upon blanket, until even I was getting warm by the sheer weight of them. She kept shivering for the longest time, until finally our combined body heat did have its effect. She started calming down, slumbering into a deep sleep. Kylie slid under the covers, spooning Kate. Ella spooned Kylie. Kara spooned me. We must have been exhausted too, in our minds and in our bodies. Or we felt so comfortable in each other’s closeness we started to fall asleep too.