Sarah smiled as she looked down on her best friend and roommate Emily. Sarah had tied Emily to their shared bed and had put a nice purple ball gag into her mouth, before going to work on her smooth pussy with their favorite toy vibrator. Emily had, of course, played her part and squirmed and moaned as her passion built at the tormenting hands and vibrating pulses of the vibrator. Sarah continued her tormenting till Emily had arched her body and squealed behind the gag as she came hard. Now both girls were resting on their bed together, Sarah gently stroking her bound roommate's body.

"Well my dear, sweet Emily. It seems like you had a nice blastoff there, and I know you love to blast off, just like you like to make me blast off when we change our roles. But while you were recovering, I had a look on your computer, and saw you had a deep passion for ponygirls."

Sarah watched as Emily's eyes opened up a bit wider, but she smiled at her roommate, and tickled her pussy as she continued.

"Well, I love the thought of ponygirls too, my sweet Emily. But you know, we both can't be ponies at the same time, unless we include someone new into our games. But that doesn't mean we can't go looking for the perfect tack, now does it?"

Sarah smiled, as she saw the relief in her lover's eyes, and she could feel the heat from her pussy and the passion in her eyes, as Emily thought of their shopping trips. Sarah smiled, seeing the look of excitement in her friend's eyes, and knew they were going to have fun tomorrow.

Sarah and Emily went to sleep for a few hours that night, and woke up the following morning at about 9 am. Sarah untied Emily and both girls smiled as they climbed into the shower together, each taking turns scrubbing the other down, and shaving their bodies smooth. The girls giggled as they dressed, each picking out a skirt, crop top tee, and sandals. They put their hair into a ponytail, and each made sure their purses had their credit cards and their papers, before leaving their shared apartment.

It wasn't uncommon for female roommates to be stopped by the security patrols to make sure they had their freedom papers, which were required after the central government fell to the state militias after some disastrous policies led to an almost 80% hike in taxes. The end result in the aftermath of the revolution was that states could impose their own laws, and many made it a requirement for unmarried females over the age of 18 to carry their freedom papers with them. Of course, women's groups had protested, but once the laws went on the books, women without papers soon found that they were being led off in chains, and sold on the block to anyone who wanted their own personal slaves.

Sarah and Emily, like all the younger girls who had been born after the revolution, had simply learned to live with the requirement, and in a sense, they found it to be exciting to know that they could simply forget their papers, and find themselves bound and gagged and led off to the slave auction. Many girls found the thought thrilling, and some had gone so far as to make their lovers hold their papers. Sarah and Emily had shared their papers now for a year, and both girls tingled at the thought that the other could speak a word, and could doom her friend to the life of a slave, just like that.

As the girls drove to the pet store, they thought of the problem of how to be ponygirls, and still maintain their freedom. They knew that asking an unknown person to be their trainer was taking a huge risk, and yet they both wanted to be in tack together as well. They decided to table their thoughts, as they came to the pet store, and their pussies began to juice as they beheld the sights before them.

The pet store wasn't quite what they had been before the revolution. Now, out front, girls could be seen squirming in pony tack, or tugging on leashes, or sitting in cages, all waiting for someone to either claim them from the store, or buy them for their own use. Sarah and Emily smiled as they admired a girl about their own age, as she wiggled in her pony tack. The girls admired the way the ponygirl was harnessed, and they took time to examine the tack in detail.

Sarah and Emily looked at the ponygirl's hoof boots, and noticed they were laced up tightly. The hoof boots looked like high heeled boots, but the back heel was missing, and the sole instead was shoed with a metal horseshoe. The girls moved up the helpless ponygirl's body with their eyes, looking at the harness. They could see the way the harness supported the girl's breasts, the corset that was built in, and the locks and buckles in the back, rendering her helpless to remove it. The girls also noticed the crotch strap that split the ponygirl's legs, and they could see the stiffness that indicated a thick dildo buried within her pussy. The girls also noticed the thick bushy tail, and smiled as the girl wiggled her ass, sending the tail swishing, to tickle the backs of her legs. The girls continued looking up the ponygirl's body, to her head, where they saw the complex bridle and bit system, and were surprised that the ponygirl had the restrictive pony mask on, which made her head look like a horses head. The girls saw that the bit and bridle was connected to an interior system, but because of rules and etiquette, they didn't dare touch to ponygirl, to see how it was connected. They did see the ownership disk, and took note of the name.

The girls then entered the store, and smiled as they entered their dreams. Within the store was everything needed to turn a girl into a helpless pet slave, to please their owner. From rubber puppy suits to the most complex pony tack, even exotic pets like mermaids could be made within the walls of the store. Sarah and Emily saw the pony section, and made their way over to the rows of equipment, smiling as they got used to the smell of the leather. The girls wandered the aisles, first picking out a cart, and a few items for their shared use. Then came the moment of truth for the girls, the time to buy each other's tack and risk being turned into the other's ponygirl.

A smiling sales lady came up to the two girls, and asked if she could help them with their selections. Sarah smiled, and said they were free girls, but holding each others papers, and that they would be taking turns being each others ponygirl, but that they wanted to have matching tack sets. The sales girl smiled and nodded, and began asking the girls if they wanted the most restrictive, stimulating, or least expensive tack. The girls didn't wait, and said that they wanted the best, and the most restrictive, so that the one in the tack knew she was the pony of the other.

The salesgirl smiled, and led the girls to the tack section, where she began fitting the girls for their tack. Emily went first to be tacked, and so Sarah got to pick the tack they would both end up wearing, when Emily and she changed roles. Sarah picked out a harness similar to the one they had seen the ponygirl outside wearing. Sarah watched as the salesgirl draped the corset harness over Emily's body, and began by lacing tight the corset. Sarah could see how the corset supported Emily's breasts, while still leaving them exposed, and smiled. Sarah giggled as she picked out the dildo for the crotch strap, and she smiled as Emily was forced to spread her legs to allow the salesgirl to slip the monster into her dripping pussy. Sarah picked out the pony mask bridle system, and for the first time, saw how it actually worked.

Sarah watched as first a head bridle was placed around Emily's head, and buckled tightly. Then a ball bit gag was placed into her mouth, before being snapped onto the bridle system. Then the salesgirl picked up the black mask head, and began securing it to the bridle, sealing Emily's head within. Sarah now saw that the eyes were positioned to allow just a small glimpse out the front, but otherwise restricted the wearer's field of vision. She smiled, and watched as her lover was fitted with her hoof boots, and a big bushy tail, and finally had a mono-glove arm binder slipped over her arms, pinning them to the small of her back.

Sarah smiled, and allowed the salesgirl to make notes of the selections, and to mark which holes were the best to secure Emily with. Then the salesgirl asked if Sarah wanted to try on her tack, and get a photo of them in their tack together. Sarah didn't want to have them both in their tack, however, within the store, and so she said she would try on her tack, but only once Emily was released from her bindings. So the salesgirl went off and started gathering the tack for Sarah, while Sarah unbound Emily and placed her tack into her personal shopping bag.

The salesgirl returned a few moments later, and began tacking up Sarah, while Emily watched. Sarah squirmed a little as her corset was tightened around her waist, and as her breasts were adjusted to fit comfortably in the half cups. She blushed as she was impaled on the dildo and felt it buckled up between her legs. She quivered as the bridle was fixed over her head, and she saw how restrictive the horse head mask could be. She teetered on her new hooves as the boots were fixed onto her feet, and she wiggled her ass as she felt the horsehair tail being fixed to the back of the harness. She allowed her arms to be secured into the arm binder, and she knew she was helpless now, till Emily released her.

Emily smiled as she saw her lover in her pony tack, and knew the feelings she was feeling now, as Emily herself had felt them when she was in the tack. Emily heard the salesgirl question about a photo of them together in tack, and knew the risk, but she decided it would be worth it. Emily however did take one precaution. She made it a requirement that after the photo was taken, one of them was to be released from their tack.

Sarah could only watch helplessly as Emily was re-tacked in her pony tack, and she knew she was helpless to stop anything that might happen after that. Soon, she and Emily were both in their tack, and being led to the photo area. Both girls were hitched up to a rail, and a photographer came by, and snapped photos of the squirming girls from all angles. True to their word, however, the sales girl did take off Emily's tack. Emily smiled, and led her bound lover to the front of the store, where she paid for both sets of tack, and the other items they had bought, as well as the photo collection, all with Sarah's credit card.

Emily led Sarah out front, and hitched her lover to the pony cart. She smiled as she pinched Sarah's nipples, and watched her squirm between the shafts of the cart. Emily saw the bound ponygirl they had seen as they entered the store, and an idea came to her. She walked over to the pony, and took down the address of the pony's owner, and smiled. She scribbled a note, and tucked it into the small mail slot on the cart, and then she went back to her lover, and climbed into the seat of the cart. Emily smiled and picked up the driving whip, and lightly gave her lover a smack on the rump.

Sarah leaned into the harness, and began to pull. She was helpless to prevent anything, and she was getting her dream. As the cart settled into a nice pace, Sarah could feel her tail swishing in the breeze, tickling the backs of her legs. The dildo in her pussy was pumping in and out with a rhythm that soon had her squirming. Every so often, Emily would crack the whip on Sarah's wiggling ass, bringing a startled yelp from her helpless lover.

Emily drove Sarah back to their apartment, and then smiled as she left her lover hitched up to the public hitching post in the parking lot, and hailed a cab to take her back to the shop, to pickup their car. Sarah could only stand there, as her neighbors passed her, some occasionally giving her an appraising look, others offered a sip of water. Sarah was left there for nearly an hour, before Emily returned, and led her up to their apartment.

"Sarah, my sweet, lovely ponygirl, I got to talk to the owner of that cute ponygirl we saw at the shop. She has agreed to train us, to be a matched pair of ponygirls. She will be coming by to collect us both in a few minutes. We will be her ponies for the next 6 months. I knew you would be upset if I told you while you were unharnessed, so instead, I am telling you now. She holds both our papers, and has signed an agreement with us, to release us in 6 months, to allow us to resume our lives, or to sign over our papers to her for life. Now, I am going to take you to the hitching post, and you are going to wait for her while she comes for me. I hope you can enjoy what I have done for us, my lover."

Sarah squirmed and wiggled, but she was helpless to resist, and Emily simply slapped Sarah's ass, till she meekly allowed Emily to lead her back to the rail. Sarah whimpered behind the mask as Emily tied the reins to the post, and went back to their apartment. It wasn't long after that a pickup towing a horse trailer pulled into their parking lot. Sarah watched as a woman walked up the stairs to their apartment, and a short time later, came down leading a bound Emily. She came over to the hitching post, and untied Sarah, and led both ponygirls into the horse trailer. Sarah and Emily felt their bodies tied to the trailer, and heard the door slam closed. Sarah turned her head as much as she could, and saw Emily doing the same. Both girls looked at each other, in their tack, and as the trailer started to move, the girls quivered in their bonds, cumming on their dildos.

Six months later, Sarah and Emily were released from their tack, and taken to the woman's house. They were allowed to bathe, shower, and get dressed, before they were led into a large room with a table in it. On the table were Sarah and Emily's papers. The woman was sitting on one end of the table, watching the girls.

Sarah and Emily looked at each other, and picked up the pens...