A delightful little whistle of a toy train sounded off as it chugged around a squirming rectangle of latex – Several wires were coming out of a small hole near the bottom right corner, snaking up to the cause of the squirming: Jessicka, a demoness in servitude to, and tortured by a nymphomaniac Mistress. No two wires went quite in the same direction once sandwiched inside the vacbed with Jessi – The first two ran to her ass and pussy. A long, large ribbed metal butt-plug was crammed deep into her rear, and her pussy was filled with a metal dildo-plug shaped more like a canine cock. Her cock was still currently locked into a chastity-belt-like device that used technology pioneered by her owner's company, which uses dimensional holes to make her entire shaft a literal cock-gag strapped to her head, and down her throat. This would normally limit her breathing, but the vacbed didn't have a hole for her to breathe through at all – Instead, medical tubes were filling her nasal cavity and deep into her neck, surpassing her cock to get into her lungs. She wasn't free to breathe through these tubes though – Airflow was pressurised and regulated by a laptop sitting next to the vacbed on a separate table. Said laptop also controlled the alligator-clamps painfully pinching her nipples, as well as both dildo-plug's and the various E-stim pads all over Jessi's trembling body. 

The laptop's screen was split into four quadrants, all appearing to run a similar programme, but coloured differently. Each colour coordinated with different little railroad signs sized to scale with the train chugging its' way around the table Jessi was trapped atop of. They were fairly spread apart around the track, and appeared to infrequently change colours at random, or completely revert back to white on occasion. If a sign was lit when the toy train passed, it would toot its little horn and trigger whichever programme matched the sign colour – The demoness couldn't hear the train at all, or much of anything due to heavy duty earplugs topped off by ear muffs, so it was always a surprise when the toys and clamps started vibrating or shocking her, the e-stim was made a separate colour for added torture. It was tricky to get the last programme to run, which managed the airflow, but the tank was capable of holding about 8 hours of oxygen in total – However, it was frequently turned off as a part of the series of tortures, and had managed to last almost 12 hours so far. With Jessicka being a particular type of demon that has no corporeal form, she doesn't actually require oxygen to live and would normally lose connection with her host body. Unfortunately for her, she has a permanent hexed collar that forcibly keeps her trapped within the body. She would effectively suffocate and black out, but her natural regeneration fixes the body after enough air is supplied, while maintaining it in the mean time. It happened several times over the course of the 12 hours she's been trapped.

As the toy train rounded the corner near the demon's head, the vibrations were triggered while the air supply remained cut off. Unable to help but start moaning around her own cock, desperately licking and suckling on it as best she could while her, Jessicka struggled wildly in her 'favourite' Bolero-style straitjacket – Arms wrapped around the front of her torso in a tight hug. She couldn't really move much, but she rocked and rolled her hips as much as possible, trying her damnedest to find some purchase on the set of dildos stuffed within her, but no matter how much she bucked and worked her cock like a lollipop, the train would pass another active rail sign a few minutes later and switch from vibrations to no stimulation at all – Just air. Screaming out around her dick like she had so many times before, crying out the best she could to please at least have one orgasm! What she didn't know was that her Mistress left for a cocktail party about an hour after getting everything set up, and the house's caretaker left a few hours after the Mistress did - They checked to make sure all the programmes were running correctly, as well as that there was plenty of oxygen in the tank – Jessi had been screaming to a completely empty house. 

Jessicka's life was often filled with chastity intermixed with extreme edging and orgasm denial, while usually forced to give her owner several climaxes throughout the day – She was only allowed to, or even able to cum on her birthday, which was usually 24 hours filled with unrelenting sexual pleasure. There were some special events where she was used as a sex doll for a party, or to test a new device, and was allowed to cum then if she was especially good.

Being unable to time when her airflow might turn off, Jessi was often forced to take deep panting breathes and then if she was able to actually catch her breath, hold onto as much as she could just in case. The airflow turned off again, switching to the e-stim pads – They were turned up to near-maximum, which sent her body into a strange series of twitches and convulsions while she tried to hold onto what air she had left, but when the programme switched over to vibrations after 30 seconds of shocking, she was quickly running out due to her squeals and moans. 

Finally, after what felt like almost 5 minutes running the full gambit of torture, she was given a respite of no stimulation and a fresh flow of air – Having nearly passed out, she was incredibly woozy, but gleefully sucked in the oxygen. 

Suddenly, the demoness felt strong hands gripping her hooves that slowly ran up to her thighs – Firmly kneading the trapped, sweaty thighs in a way Jessicka was quite familiar with. They rubbed around and around, slowly inching closer to her crotch, and once they reached their destination, they deeply massaged what was available of her pubic region for a few minutes. Jessi thought for a second that the damned torture was finally over, having swallowed a lot of her own pre, she was quite ready to get out! Instead, the full strength of the electric connections to the toys began to violently shock her, drawing out desperate screams, but that seemed to only encourage the hands to run further up her body, tickling her tummy and hips a bit. Eventually, the strong hands landed on her breasts and began to squeeze them roughly while Jessi uncontrollably writhed underneath the sturdy layer of latex. When the shocks finally ended and she stopped convulsing, Jessicka realised she couldn't feel the hands anymore, and something firmly pushed up against the dildos inside her – Pushing them in just a little deeper. With no warning, the two toys were powerfully vibrating, but not in the same way as before – A Hitachi wand was firmly held in place as Jessi wantonly humped as best she could into it. Lathering her own cock in her mouth with a fresh coat of saliva, and getting deep into the sudden, strong vibrations – Hoping beyond hope that this was her chance to finally cum, as it was presumably being done by her Mistress.

Half-expecting the wand to be pulled away as her humping into the wand became more about just having it pushed hard against the tips of the plugs inside her, and her moans reaching the perfect squealy pitch that gave away her impending orgasm, but it remained, on full-throttle no less. At this point, Jessi had practically lost her mind with pleasure, and would let her future self deal with the punishment, because she was forcefully pushed over the edge and made to cum almost as hard as she does on her birthday. A feeling of relief washed over her climaxing body, all the tension from the half-day of torture melted away as she swallowed rope after rope of cum firing off in her mouth – As well as all the juices leaking all over the toys inside her. Jessicka kept sucking and licking her cock all over, milking herself and every second of release she was finally given without a care – It was about the best orgasm she'd had in 9 months! When the wand wasn't turned off or pulled away, the demoness did start to panic – Her vulnerable body was left in a very sensitive state, and she hadn't even finished her first orgasm as another fresh wave flowed over her. Unable to control her lusty need for it, she did the same thing as before and pushed as much as she could into it – Scream-moaning as loud as one could with a dick in their mouth. 

As the second climax not-so-slowly passed, the Hitachi wand was pulled away, and Jessicka could feel the vacbed suddenly loosening its air-and-skin-tight grip. The top sheet was flung off her incredibly sweaty body, and her skin could finally felt the cool, fresh air. She could hear the low mumblings as if someone was trying to talk to her, but her ears were double muted, and a redundant blindfold still remained blocking her sight, even with the sheet removed. Far too tired to even try sitting up, Jessicka just laid there to see what might happen next – Two harsh slaps, one for each breast, made her jerk and squeal in surprise and pain, especially because of how they tugged on the modified nipple clamps. Mumbling around her cock, Jessicka tried to express her confusion with apologies. Her Mistress removed the earplugs and headphones, as well as the blindfold, “I do not believe it is your birthday, my little bitch.” There was an underlying serious tone, but she had a bit of a smirk and joke-y nature about her.

All the wires were removed next, along with the nose tubing, but the clamps were left on Jessicka's aching nipples – The dildos were slipped out as well. Jessicka's Mistress unscrewed the dimensional ring that held the demon's cock in a slightly wide-base piece puck of sorts – It was unceremoniously crammed into Jessi's trembling ass, it was her usual daily butt-plug these days, and a bright pink pair of full-bottom, bikini-style latex panties were pulled up her legs – Forcing Jessi to not only tremble and squeeze around her cock in her rear, but to stew in her sweat and juices as it snapped tight to her body. “You are pretty lucky that I landed an interesting contract with a particularly wealthy millionaire tonight. While you were lying here trying to cum your brains out, I made a deal to let him borrow you for testing some of his own machines – He showed me some design videos of how they work, and he needs to make sure they will not hurt his wife TOO much.” The Mistress small smirk slowly turned into a wide grin, Jessi simply gave a quiet whimper, “Wh-Wha? No way! I'm-” She hated saying it when she wasn't forced to, “I-I'm yours...” Her onyx flesh hid her deep blushing, but she was given no time to worry as she was semi-forced off the table. The train had been stopped, and the laptop was closed, with all the wires and toys to be left to be cleaned up in the morning. 

On wobbly hooves, Jessicka was dragged out of the new 'train-ing' room and down the main hallway into her Mistress's bedroom – The stir of her sensitive cock in her rear drew out some moans until she was tossed unceremoniously onto the giant bed. She simply bounced and rolled, because her arms were still locked into the self-hug of her latex Bolero-style straitjacket, but the momentum was not lost. The demoness was quickly pounced on and the ring-clips that make up the tips of the sealed-shut sleeves were removed from the loop rings in the back – Though it was no cause for celebration as her arms were simply reversed and the rings were clipped to the matching loop-ring on the front; trapping her arms under the small of her back and causing her to arch. Straddling Jessi's now-exposed belly, her Mistress ripped off her short cocktail dress and squeezed Jessi's sides with excitement. Quickly, the two  of them rolled over – Jessicka was forced down to rest her face against the crotch of her owner, and she knew what was coming next. The clearly aroused, musky scent actually did drive Jessi wild – Though she's pretty sure it's due to all the Pavlov-like training. Feeling the strong legs of her Mistress slowly enveloped her head, it forced her nose deep into the latex-clad vulva, which she promptly grinded up and down with said nose. Thankfully the sheets were rather slippery, so they didn't snag on her nipple piercings, but with her breasts mooshed down into the bed, it still made the clamps hurt more – Occasionally causing a sudden jolt of pain, making her squeezing her cock buried in her rear, and drawing out a moan – Much to the delight of her Mistress.

They moved around plenty that night, especially as the demoness moved onto licking up and down the panties, and doing all she could with the tools she had. Eventually the panties were removed, and Jessi's face was mounted, smothered in the soaked pussy of her owner who also made sure to make sure her little pet could barely breathe – So every gasp for air was filled completely with her musky, sweaty scent from hours spent in latex panties. Various positioned were used throughout the night, but Jessi spent most of the night between her owner's thighs until what seemed like the fifth orgasm, where she was pulled up into the 'small' spoon position and gently held until they both fell asleep – It was rare for Jessi to get to sleep like that, she was usually put into her vacbed or had to sleep at the foot of the bed like a puppy, but she wasn't complaining. She was exhausted though, and still had no idea what the hell this mystery millionaire had planned for when he 'borrowed' her, so she decided to just take the small win for now – Especially getting away with two orgasms and no punishment!