The ponygirl and her rider were Kelly and Elissa, now in the third hour of what was promised to be an 8 hour marathon around the corridor.



The marathon had started for them shortly after Mistress XS had left her instructions with Ilsa in the Rubber Dungeon, Ilsa busying herself preparing the two girls for their pony and trap ride.



The circuit they were going to take ran around the inside of the Group’s underground headquarters. The corridors of the building effectively created a rectangle which measured about 160ft by 50ft, so one lap of the circuit would take the girls over 400ft. The corners were the most difficult for Elissa to manage, although the corridors were wide, with doors leading to the various facilities on either side, she had to turn quite sharply with the trap trailing behind her.



Fortunately, the members of Group XS had thought about this when they had designed their diabolical torture. Running around the ceiling of the corridor was a chain drive, rather like they use in warehouses, which would encourage Elissa to maintain a steady pace around the circuit. Also, the trap had been designed to be as compact as possible, so that the whole ensemble, the girl pulling and the trap itself would turn on as tight a radius as possible.



Ilsa had started by preparing Kelly. She’d removed the girl’s thin rubber panties and bra so she was left wearing her full rubber suit but had her battered ass and tits exposed. Despite the protection the rubber had provided during Mistress XS assault, she was so bruised and battered it almost looked like she was still fully encased in black rubber!



Then she had fitted Kelly with a feeding gag a black leather strap which fitted around her head with a shiny stainless steel funnel erupting vertically at the front. The part which fitted in her mouth was little more than a metal tube inside a modest rubber ball.



Of all the gags Kelly had experienced in her short time with Group XS, this was perhaps the least offensive and most frightening. You see, she soon discovered that the ball prevented her getting her tongue over the end of the tube; she was left with no choice other than to swallow whatever was put into the funnel!



What went into the funnel was simply water. Ilsa filled a metal jug from a tap and began to steadily pour the water into the funnel in short bursts. Kelly spluttered and coughed as she was forced to swallow, but this didn’t deter Ilsa from her task; if anything it spurred her on.



Kelly couldn’t believe Ilsa intended her to drink the whole jug of water, there must have been over two pints in it, and was relieved when she stopped pouring with the jug half empty and placed it on the floor. Her relief, however, was short-lived as Ilsa undid the zip which ran through the crotch of her rubber catsuit. You didn’t think I’d stop at plain water, did you? She said as she saw the realisation in Kelly’s eyes.



Sure enough, she placed squatted over it to allow a steady stream of her piss into the jug. Kelly couldn’t believe how long the stream ran for and was mortified to discover that the jug was almost full again as Ilsa resumed her pouring. On Ilsa went, pausing to allow Kelly to breathe from time to time, but steadfastly sticking to her task. On a couple of occasions she added some spit to the contaminated water, making the prospect of swallowing the next serving of water even less appealing for Kelly.



Once she’d forced the best part of three pints of liquid inside the girl, Ilsa added one little refinement. In the scheme of things it seemed almost irrelevant to Kelly, but, as she would found out later, it was perhaps the most insidious part of the torture which was being bestowed upon her. Ilsa inserted what Kelly assumed was a catheter into her urethra.



She’d then wheeled the trap over to Kelly - a strange device with the sinister air of having built to be uncomfortable.



Essentially it was a metal seat, not unlike that of an old-fashioned tractor, sitting directly over 2 wheels, each about the size of the average bicycle wheel. The wheels were close together, no more than a shoulders width apart, and as she brought the device over it could be seen that they were slightly eccentric; in other words less than perfectly round. This had the effect of making the trap rock from side to side as it moved.



Aside from the rocking motion, as it moved the seat on the trap slowly rose up, no more than a couple of inches, and sat like a mousetrap ready to snap back down. Kelly was unaware of this as the devise was manoeuvred into place; all she saw was Ilsa fiddle with the seat so it lay back down flush. When it did so, rounded metal pegs protruded inch or so through holes in the metal seat so it ended up looking like something from the Torquemada!



What worried Kelly the most, however, was the metal post rising up from the front of the contraption. This had two sets of cylindrical metal jaws strategically placed at breast height which looked like they were designed to clamp down on the rider’s breasts. Each jaw was split into two halves, one which would go under the breasts, the other over, separated by a gap. Somehow to Kelly it looked as if the lower jaw was on a lever which would raise it up; she shuddered at the prospect of having her breasts sandwiched in the device, especially when Ilsa moved it fractionally and she could see the inner surface of the metal it was peppered with metal studs!



Ilsa easily manoeuvred Kelly onto the seat, and planted her ass firmly onto the metal surface where the pegs sent shock waves through her already battered rump. If Kelly thought she could lift herself free from the pegs, she was sorely disappointed when Ilsa fastened a well-worn leather belt across her lap and tightened it so the strap sank into the shiny black rubber she wore creating little mounds either side where her flesh bulged out.



Next Ilsa ran a strap around Kelly’s midriff and the pole, holding her loosely forward; Kelly was relieved that this strap was not so tight she was pressed tightly to the bar. Silly girl, she should have realised the strap was deliberately loose.



With the strap around her midriff, Kelly’s breasts were inevitably forced towards the two halves of each cylinder, one fitting above and one below. Again, Kelly was relieved as Ilsa threaded her mammaries through these that there was plenty of gap between them and, although the underside of each breast rested on the studs, her breasts were in no way squeezed. That was a real relief as the beating from Mistress XS had left them looking like two pieces of raw steak!



Next her neck was attached to the top of the pole with a high leather collar which was connected by a single metal loop through a hasp on the pole. Kelly was now pressed forward towards the pole, her breasts inside the metal cylinders and unable to look down to see what happened next.



What happened next, was that Ilsa picked up a metal rod, perhaps 2ft long, which had a ball, rather like the metal ball on a towing hook, on an adjustable vertical rod at either end. She centred one ball underneath Kelly’s seat and fixed it in place with a couple of wing nuts. The bar was obviously heavy, and Ilsa was relieved to let go of the weight once she’d got the wing nuts in place. Unable to see what was happening, the first Kelly knew that the large metal ball was being raised up was when she felt it press against her vulva through a matching hole in the seat!



She tried to resist, but her pelvic muscles, weakened by their terrible battering, were no match for Ilsa’s determination. The ball passed through her lips and continued its journey inside her cunt until the ball was pressed surprisingly firmly against the mouth of her cervix. Once the ball was home, Ilsa locked it in place and Kelly was almost ready. Her legs were doubled back underneath the contraption and strapped in place; her arms were pinioned behind her and fixed to a ring at the back of her collar, and she was fitted with a hood.



Compared to some of the hoods she had worn at Group XS, this was relatively simple; just a plain black rubber hood which covered her head, blanking out her eyes, but with a hole so her mouth was free. That is, it was free until Ilsa added the gag.



Kelly could not see that the gag - a ball gag on a leather head harness with both a chain and a tube running from it - was attached to a lever in front of her.



The principal, which she would discover once she was in motion, was very simple. If she pulled her head back, the chain pulled on the lever in front of her; in so doing she lifted the lower jaw of the cylinder around her breasts and, if she pulled hard enough, could clamp her breasts so hard her weight was supported by them! Little did Kelly realise at this point that in just a short while she would be desperately trying to do just this!



Ilsa left the tube hanging free there would be time enough to set that part of the predicament up once she had prepared Elissa.



Her instructions from Mistress XS had been clear; I’d like you to dress her as a ponygirl in the tightest rubber you can find…it should be an interesting experience for her to have 2 or 3 layers I especially want her to have one of those hoods with the gel hood on the outside and the discipline and thin hoods underneath.”



Ilsa was happy in her task as she left Kelly fixed to the trap and began to find the rubber clothing in which Elissa would be performing as a pony. For her part, Elissa was less than happy having watched how the other girl had been fixed to the trap and at the mounting pile of black rubber which was being assembled in front of her.



Elissa had always been repulsed when she’d seen pictures of men and women wearing rubber in some of the magazines her friends had shown her; she’d certainly never imagined she would be forced to wear it!



Once the rubber was assembled, Ilsa collected some scissors, water, shaving foam, a razor, lots of strips of waxed tape and the jug and feeding gag with which she had poured so much liquid inside Kelly.



It’s probably fair to say Elissa hadn’t known whether or not Mistress XS was serious about losing her hair until these things had arrived, and it was only once they did that she tried with all her might to escape the hemp rope which bound her. It was a futile effort, she’d been tied by an expert, and so it was that Ilsa was able to fix her in a gynaecological chair for her depilatory.