(I'm going to assume you press the button at the same time as Keithley)

Keithley looked over at Nanaca and could feel her shock, her amazement. Nonetheless, she had agreed. Keithley placed his hand over the red button, eyes on Nanaca.

"Ready? Now," he said, pushing down on the button. The effect on the girl was instantaneous. Her body bucked and writhed, twisted and clenched, every muscle going taut until it looked like she might snap. Her back arched back and bowed forward, driving her away from the pain and towards the pleasure, her hoarse voice somewhere between a scream and a moan. Her entire body was covered in goosebumps, and her nipples and clit were amazingly stiff. Her sopping cunt practically blasted her honey onto the floor, her tortured form only prevented from slumping to the ground by her restraints.

She gasped for air, looking up at Nanaca sadly. "Very good," said Keithley.

(you assume correctly =3)

Very Good?. Such an evil man. With every passing moment, she was coming to hate and fear the scientist standing close to her. Nanaca wanted to strangle him, set loose the girl, and flee with her for dear life, but that was all beyond her power, those robots earlier could easily chase and overpower her, and she would be the next test subject. Nanaca had been a willing accomplise for the time being, but all that he was making her do to the subject was pushing her resolve a bit too far. She works up some nerve to try and question the white-clad researcher.

"W-would that be all, sir? I would think the subject has had enough 'stimulation' for the time being."

"You're absolutely right," said Keithley, making some more notes from his observations. "Now we move on to the next test subject."

The girl suddenly had her restraints released, and her gasping body was picked up by the robots.

"Bring the next subject to the testing area," Keithley said, and suddenly Nanaca felt herself being grabbed again. A machine brought her to the same area that had been occupied by the girl only seconds before, and she was quickly restrained.

Back at the table, Keithley now manned the green button, while the girl that had been the first test subject now had control of the red button. Her eyes gleamed with venom as she looked at Nanaca, and, without Keithley even prompting her to do so, she mashed her hand down on the red button.

"WHAT THE?! HEY!!"

Oh cruel fate. Now the tester had become the testee. Nanaca couldnt put up much of a fight, the mechanical abominations were made to be fight-resistant. Suddenly, she finds herself locked tight onto the rig once occupied by the girl she so wanted to save, only to find that the object of her pity seems have grown a grudge against her. Those eyes burned with hatred, the girls finger quaked, eager to press the red button.

"Wait! I was~ GYAAAAAAAAAAAHHHH!!!!"

The finger pressed, and soon Nanacas nerves were flooded with an indescribable feeling, like a white hot knife mounted to a jackhammer running on full blast, multiplied by a thousand, and multiplied by a thousand more. She hadnt felt such agony till now, her body arched, eyes wide, mouth wide open, she screamed with such magnitude that were the room not sound proofed, it would surely have been heard throughout the structure. The girl, on the other hand, seems to be enjoying her handiwork, keeping her finger down and watching Nanaca experience what she had.

Keithley watched and noted his observations as Nanaca was tortured. He did not seem to care that the young woman was pressing the button. After a second or so, the girl released the button, smiling with sadistic glee. Keithley waited a second or so, and then pressed the green button.

It had stopped, just as suddenly as it started, and Nanaca was relieved, she was in a daze, but she could see the other girl was actually... smiling... she actually enjoyed giving her pain! With nary a moment to catch her breath and with the feeling of agony still fresh in her mind, Nanaca suddenly becomes flooded with the other extreme, sheer ecstasy. Her skin tingled, her body burned with so much lust, it felt like a hundred vibrators dancing over her skin, more so in her now gushing passage. Her nipples grew hard under her shirt, poking through past her bra and very visible though that thin blouse, her panties became so sodden that the juice practically dripped past them, some even dribbling down her inner thighs. It was so intense the she didnt even feel the build up to release, only the release itself, an orgasm of terrifying intensity that wracked her body, several in fact, all causing the same reactions as when the red button was pushed, only instead of a piercing scream, a chain of lust-filled moans emanated from the her lips.

"SSSSSSTOPPP!!!! I... TOO MUCH!!.... C-CANT!!.. UUURRGGHHH!!!!"

"Of course you can," said the girl, her eyes glinting with malice. "After all, I did, and you didn't seem to mind then."

The second Keithley took his finger off of the green button, the young woman mashed the red one not once, but twice.

The naked girl sneered at Nanaca, her nipples erect as she tortured the girl.

Sometimes, karma just doesnt pan out, or maybe it does. Before being even given the slightest chance to recover from those chain orgasms, her body is struck once more with that hellish pain from before, only this time, it was twice as agonizing. Under normal circumstances, a person would pass out from such an experience, but the machine held a secret; it didnt allow for such. It kept Nanaca fully aware, fully conscious, to accept the entire dose of suffering she was being given. She writhed and jerked in her binds, seeking comfort of any sort from the device's torturous grip, but there was none to be had. Tears flowed freely down her cheeks, and her screams echoed through the room, music to the other girls ears, and just another desired result for the scientist.

Keithley waited for the pain to subside before pressing the green button twice in succession. Waves upon waves of pleasure hit Nanaca's clothed body, and the girl smiled. "Wow," she said, "I can practically feel the pleasure myself!" She licked her lips and put her finger on the red button, but did not press it. Turning her head to Keithley, she said, "Together, then?"

Oh joyous respite, even if only for a moment or so, it was welcomed with panting breath and sweat covered body, her chest heaved as she tried to draw in as much air as she could. And just as the horrid sensations worked its way out of her body, it was flooded anew with feelings of ecstasy one could only dream about, and it was double that of previous, like a massive sexual orgy going on for several weeks straight condensed into a few moments of electric pleasure. Her body arched again as her muscles tensed at the onset of climax.

Nanacas breasts swelled, and a damp spot was making itself shown on her blouse, a pair in fact, right over where her nipples should be. Bigger they grew, till the cloth could bear no more liquid, causing it to trickle down the rest of her blouse, occasionally dripping on the floor, mixing with the overflow of honey from her dripping sex. She orgasmed continuously , past her own limit, forced by the machine to cum and cum again, her lips letting out an incoherent mix of moans, grunts, and squeals.

Then it had stopped, leaving Nanaca dizzy, disoriented, and gasping for breath. She looked at her tormentors, and spied where their fingers lay, and it horrified her. Once pondering what it would have felt like when both buttons were pressed, now she was going to find out first hand.

'No... please... dont..."