Beth moaned in pleasure as Ben coated one of the probes in conductive gel and inserted it into her vagina. Her muscles immediately gripped the object as they reacted to the sensation of the penetration but Ben wasn't done there.

He attached the probe to a long wire which he had connected to the machine and then began turning a dial so that Beth felt a light tingle inside her. The tingling began ramping up her arousal suddenly and it caused her to gasp and moan in surprise.

As these new sensations increased, Beth felt her vagina and all of her surrounding muscles involuntarily contracting and then releasing around the probe. Her entire pelvic region was rhythmically tightening and then releasing and to Beth, it felt almost like the waves of an intense orgasm were rolling through her body and her vagina oozed natural lubricant copiously as her pleasure increased.

Just as she did when she was cumming, Beth panted through each contraction and cried out loudly when the pleasure hit her. As the sensations continued, she began mentally calculating when she would experience the next blissful electrical impulse and she anticipated how long it would be until the probe would take control of her arousal in such an intensely pleasant way again.

Whilst all of this was going on, Ben was observing her reactions and making notes on a chart, increasing the intensity of the stimulation in small increments. Each time he turned up the dial, he watched Beth closely whilst she bucked and moaned in response to the feelings he was giving her as the current pulsed through her.

Beth gasped as Ben turned the machine right down and the first probe was removed, only to be replaced by a different kind, controlled by two separate wires which this time were slid into both her vagina and her bottom hole simultaneously, creating a really delicious stretch as it filled her up completely.

The penetration of both her holes ignited a totally different but still non the less pleasant sensation and although the stretch was slightly painful, Beth loved feeling so full and she tilted her hips up to accept more of the penetration as each probe slid deeply into her.

Once again, as Ben turned the dial, the tingling began, slowly merging into deep throbbing and then finally, unbelievably intense contractions which mimicked those she experienced during orgasm. Beth made soft breathy moans as each impulse grabbed her muscles and pleasure rolled through her body.

"Excellent Beth. You are very responsive to stimulation" said Ben as she let out a loud gutteral cry when the machine changed pitches and the stimulation felt like intense knocking directly on her Gspot.

"Now we are going to play a little game Beth. I want you to count down through each contraction for me so that you reach zero when electrical stimulation ceases. I need to know the exact point of muscle relaxation ok?"

Beth's body already felt ravished and it was all she could do to stay alert to the instruction and comply with his command but she managed to count through each contraction as he told her, concentrating hard on the sensations she was experiencing.

Beth had just got into the rhythm of counting when for some reason, she chose the exact moment that Ben was opening the first syringe to lift her head from her pillow and turn to see what he was doing.

The sight of the syringe was as terrifying as it could be and as Beth saw the new hypodermic being removed from its packaging, she took in the size and length of the needle as it glinted menacingly in the rays of sunlight that flooded through the window.

The emotions that this provoked in her immediately matched the intensity of the stimulation provided by the probe and a new level of nervous energy combined with arousal pulsed through her.

She locked eyes with him fearfully as he approached her, syringe in full view.

"Each time you reach zero, I will be giving you a shot so you must concentrate and only tell me when your muscle is relaxed. Make sure you focus only on the sensation Beth, if you tell me wrong and I inject into tense muscle it will be very painful ok?"

She nodded and hid her face in her folded arms, tightly gripping the edge of the pillow with her hands whilst, with a shaky voice that clearly betrayed her nervousness, she counted down aloud. Ben held the needle in position, perfectly poised just over her beautiful bottom.

With the needle prepped and in position, Ben swept his eyes down her perfect body as he waited for her count down. He took in her beautiful almond skin, the indentations of her spine and the little dimples just above her buttocks.

She looked stunning as she lay in this position, her legs bent into a diamond shape, revealing her perfectly groomed pink sex and cute little anus, both with the wired probes jutting from them. He couldn't wait to give these shots!

"Five, four, three, two, one, zero... "