Miss Peabody waited until Hinata had recovered from being speared in both orifices before continuing. There was a lot of kudos to be had among the staff if she could steer the Black team through to win the challenge, so it was important she had a good team. She looked at the three girls and tried to assess if they were good enough to compete against the other teams. They had a strong Pony-girl, which was a good start.

Rina and Yuuko appeared enthusiastic and interested in caring for the filly, but Akira seemed almost withdrawn during the fitting of the bridle and dildos. She and Hinata were roommates at the High School and had told her they wanted to remain virgins. Under the circumstances it was a ridiculous idea, especially after having their stoppers fitted. Akira was the weak link, so she resolved to involve her more in the process and show her that she cared for her ex-friend.

Rina was examining the filly's cunt, so she pointed at its centre. "One slight drawback Rina is the animal's labia minora and clitoral hood." Miss Peabody took hold of the line of slippery flesh and tugged on it to illustrate the problem. "The cunt strap is designed to slip back and forth through the slots on the dildo. This animal would soon become excited, with such prominent and sensitive inners like these, especially as she rode the bar yesterday; so I'm going to have to tighten it to its maximum tension to stop it from rubbing."

"Won't that crush her clit, Miss?"

"Yes it will, Rina, but there is another benefit. I'll show you in a minute." She looked round to see how Tomoni was getting on. "Is the central belt as tight as it'll go, Tomoni?"

"Yes Miss."

"Then pass the end of the cunt strap to me." The inch wide strap was attached to the underside of the filly's central belt and dangled on the ground. Tomoni lifted it up and passed it through Hinata's legs. "Watch closely girls."

After taking hold of the end, Miss Peabody threaded it through, first the slot on the lower dildo, then the upper anal dildo, before easing the tip through a buckle on the top of the central belt. She pulled it moderately tight and then stopped.

"Right Rina, you need an extra pair of hands to do this." She reached in toward the filly's cunt and pushed her fingers in behind the strap, so she could prise her lips apart. "So much cream and depth ...," she muttered. Once she had demonstrated she withdrew her fingers and moved sideways to let Rina in. "Right, you pull them apart and I'll tighten the strap.

Rina eagerly plunged in. "Ughhh!" she exclaimed when she discovered Hinata's pussy was as squishy as a fruit trifle.

She persevered though and drew the thick rolls apart enabling the strap to sink into the filly's furrow. Once the strap was tight she released the lips and stepped back.

Rina, your job is to remove the dildos and strap at night and then in the morning replace them, so I hope you've been paying attention. She nodded and pointed at Hinata's rear end. "It looks as if her cunt wants to bite the strap in half, Miss," Rina observed, for Hinata's large lips had just about closed round the strap.

Miss Peabody stroked the bulging lips with her fingertips. She hadn't seen such a large natural pair on a Jap girl before. "These are the only part of her posterior that are out of bounds during practice. You can snap your whip anywhere you want, during the events and a good driver builds up the pain toward the end of the race. If I find a welt on either lip, I'll put one on your cunt. Do you understand?"

Rina nodded and then ran her hand over Hinata's upper slopes. "This whole area is extremely sensitive Miss, so I won't need to go near her cunt."

"Yes the buttocks are, but not in comparison to say her inner thighs, her ass crack and perineum." With each point she described, the teacher stroked that part of the animal's body. "Of course if you need a spurt of speed at the end of the race then snap your whip here."

After one last stroke of her labia, she pointed over to the chariots in the centre of the meadow. "Fetch a singles chariot boys so I can show the younger ones how to tether your Pony to it."

Miss Peabody left the girls studying the Pony. "I'll be back in a minute." She entered the marquee to check that it had been equipped with everything the team needed.

Three daises, two tall and one slightly shorter stood at one end, while a resting bench, wide enough for three Ponies, had been erected at the other. The balm she needed was in one of a dozen plastic tubs filled with equipment. After retrieving the tub and a pear shaped lead weight she joined the team who were still examining their Pony-girl.

The boys were on their way back with a chariot, taking care not to interfere with any of the other Pony-girls who were already trotting around the meadow pulling a chariot. Miss Peabody put the cream and weight on the table next to a set of three nub clamps and waited for the boys to return.

The chariot was one of a new batch of 8 singles carts that had been delivered just a few weeks earlier. The academy were very grateful to their sponsors, the Tanaka Tyre Company, who had become involved during the year and provided them with the latex moulding machinery and 16 new chariots and rigs.

Pony-girl and boy racing had been part of Shiraoka Academy's curriculum for more than 10 years, but it only became important and the focus of the academy after a visit from their sponsor a year ago. Now the emphasis was on the sport, she and the other teachers were under pressure to produce a strong animal capable of entering competitions around the world. The worse performer would join the academy's stables, but there was a good chance of the best performer being purchased by their sponsor.

Tomoni and Sura steered the lightweight titanium cart in behind the filly, while the other two boys lifted the curved shafts and hooked them over her shoulders. A yoke, attached to the shafts, sat across her shoulder and a curved cross strut sat on the upper slopes of her ass. The strut was padded for comfort and had two large eyelets that could be adjusted to the filly's reach, so a bar could be pushed through the Pony's static glove. Once the bar was in place and locked she was virtually part of the chariot.

"Shall I fasten these straps miss?" Akira asked.

Two loops were attached either side of the central belt and once they were fastened to the shafts, they helped the animal to maintain her Pony stance with a nicely curved back.

"Yes, Akira. Nice and tight please." She watched the teenager fasten the straps and then guided her round to face her old friend. "Akira, look how beautiful your old friend looks. Her back is curved and the shafts of the chariot help her to hold her head high proudly. I guarantee that by the end of the week, Hinata will enjoy being a Pony-girl."

"I'm not sure about that Miss," Akira said uncertainly.

"Look girl." Miss Peabody took hold of the filly's breasts and gave them a squeeze. "See how the latex moulding gives them additional lift. She really does have the perfect breasts to be a Pony-girl. Now fetch those clamps from the table and fit the smaller ones on her nipples. I'm sure she'd prefer you to do it, Akira."

The sports mistress watched the youngster reluctantly fetch the clamps and gingerly squeeze them open, before closing each one on the filly's impressive nipples. The animal let out a long moan, but her eyes showed sadness rather than anger.

"What's this one for?" Akira asked, holding up the third, larger clamp.

"That will go on her clit and hood when the cunt strap is removed. We have to train her tomorrow for the dressage and wearing the clamp will help her to concentrate on her performance."

The youngster didn't look convinced, but returned the clamp to the table, laying it beside the lead weight. Having gotten that task out of the way she turned to check out the chariot. Tomoni had fetched the main pulling pin and was showing the girls how it slotted through one eye on the strut, then the filly's glove and finally the second eye. Once the pin was in position he screwed the retaining bolt into the projecting end to finalize the installation.

The compact vehicle had been constructed using thin tubular struts, which gave it a spider web-like appearance, but when she had sat in the tiny chariot the previous day, she found it felt incredibly strong and sturdy. It was equipped with two 24 inch wheels and heavy duty three inch wide solid rubber tyres that were quite soft to the touch. There were some springs under the seat, but no suspension on the main chassis.

Looking at the chariots out on the meadow, Miss Peabody could see that the drivers were getting a comfortable ride in their specially designed red bucket seats. The 8 drivers were decked out in identical outfits, bar the colour of their skirts. Rina, all in black and grey, was wearing a light grey gauze t-shirt, which was tight and semi-transparent. The academy's crest was positioned on the right hand short sleeve and a large 'D' on the opposite sleeve.

Over her shimmering top, Rina was wearing a short black pleated skirt that had wide braces, which almost covered the youngster's thrusting nipples and areolas. However, when she moved the straps fell to the side, allowing her perky buds to make their presence known. Thigh-length black socks and knee high leather boots gave her quite an authoritative appearance, which actually suited her surly and forceful character. Yes, Rina could make a good driver, she thought.

***

Hinata's initial anger at being imprisoned in the outrageous latex bondage had subsided somewhat during the journey from the laboratory to the marquee. However, after being tied to the rail and being forced into further bondage, including a ring gag and large dildos in her twin orifices, her rage returned with a vengeance. Unfortunately, there was no way in which she could vent her frustrations, which were boiling over and threatening her sanity.

She calmed a little when Akira came into view, but was shamed when Miss Peabody grabbed her breasts and instructed her friend to snap clamps on her nubs. So, while the woman squeezed her globes, Akira tried as gently as possible to close the grips on her cherry-pips. It was a cruel way to treat two friends, but the sports mistress obviously didn't care about such things. Rina, who looked very smart in her driver's outfit, came round to see what they were doing.

"Oh, these look good on her," the spiteful youngster said, grabbing the clamps and twisting them.

"Uhhhhhh!" Hinata moaned when a flashing pain shot through her breasts.

If her arms weren't tethered behind her, Hinata would have reached out and strangled the teenager.

"Careful Rina," Akira said angrily. "Can't you see ...?"

"Stop it you two," Miss Peabody shouted. "Only harmonious teams win challenges and don't you forget it! Now Rina, climb into the seat and Akira get the reins. I'll show you how to connect them."

"Can I do anything, Miss?" Yuuko asked.

"Yes, get that jar of cream and rub it on the filly's bruised posterior."

"Including her cunt?"

"Especially her bruised cunt."

Akira returned with the reins and began, with Miss Peabody's direction, attaching them to the sides of the ring gag. Meanwhile she felt Rina climbing up into the seat and take hold of the reins. In between those activities Yuuko started smearing cold lotion on her buttocks and labia, which actually created a pleasant, soothing sensation after so much pain and humiliation. The moment the sports mistress unclipped her collar from the rail, she felt a sense of freedom wash over her.

"Back up, girl," Miss Peabody urged from beside her, while holding onto the rod attached to her collar.

She pushed back on the bar she was being forced to hold and was surprised to find that the chariot moved back smoothly. As soon as she had backed up four or five yards, the woman pulled on the rod, stopping her, and then unclipped it from her collar. She then disappeared from view.

"Rina, take her out for a trot round the meadow," Miss Peabody instructed. "Take it easy with her and let her go at her own pace for now. The whips won't be issued until tomorrow, so you should concentrate of getting used to the reins and commands. That way you'll build a good rapport with the animal. Tomoni and Sura are in charge this morning and I should be back by lunchtime for the main meeting at 1 o'clock."

"How long should we make the sessions Miss?" It was Sura asking the question.

"It's nearly 11 o'clock. Call Rina in on the half hour and send her out again at midday till 12.30. After each session water and feed her. The bottles are in the tubs and are labelled. Then the girls can each give her thighs a massage before sending her out again."

"Yes Miss, I'll take care of it."

"If there's a problem, there's a walkie-talkie in the tub. Buzz the office and I'll scoot back. Girls, the boys are in charge. Do as you're told!"

The group watched Miss Peabody walk off in the direction of the main building and then gathered around Hinata. The boys were at the front and it was Yasu who grabbed her right breast.

"I can't believe we get to play with this bitch for five and a half days," he said taking a closer look at the clamp.

Hinata stamped her foot. "Neeeeeee!" she cried as forcefully as she could.

Sura knocked his hand away. "You can touch her after the sessions, but not before. Besides from tomorrow you'll be massaging the stallion's thighs, not the fillies!"

Akira and Yuuko laughed, but Rina was getting impatient. "Out of my way boys," she cried, flicking the reins and giving Hinata the chance to butt into the obnoxious Yasu as she stepped forward.

Her additional height from the moulded boots and the shelf on the corset lifted her boobs to the level of the boy's shoulders. "Hey!" he shouted, when her tit knocked him sideways, but she was on the move and past him before he could react.

"Get a move on girl," Rina urged unnecessarily.

Hinata walked a few paces until the Red team's Pony and chariot trundled by and then set off, jogging until she was matching the pace of the cart ahead of her. With the shafts of the chariot holding her firmly, she was able to combine the strength of her shoulders and arms and easily pull the lightweight vehicle.

The moulded latex boots gripping her feet were actually comfortable, once she got the hang of the longer stride that her extended, pointed toe posture provided. She wasn't going to have a problem with the tight corset/harness gripping her midriff, but the dildos and cunt strap were an entirely different matter.

The twin invaders were snug and couldn't move about, but from the moment she started jogging they began to crush the thin membrane dividing their considerable mass. And, somewhere along that barrier was her most erogenous location, her G-spot. The dildos immediately distracted her from what was happening around her, as did her breasts, which despite their firm consistency, jiggled at an alarming rate.

Hinata was a positive thinker and knew that she had to put her shameful appearance to one side. Things like the dreadful ring gag and the awful distractions in her posterior were going to take time. She could maybe accept being a Pony-girl for five and half days provided she won the challenge for the Black team at the end of what was going to be a tortuous experience.