While Candy relaxed next to her still bound brother, the two pony siblings kissed casually. Their lips meet as their tongues happily explored each other's mouth. Nearby their owner Hannah was shaking the bars and screaming, "Let me out, now!"
Hannah's petite body strained to open the locked gate but it was useless the nineteen-year-old blonde was trapped. "Let me out!" Hannah demanded as her pony management instructor returned.
"Turn around with your back to the bars," Miss Watkins told Hannah firmly.
"No," Hannah screamed back at her, "I will not become a ponygirl. Just open the gate and let me out."
"The law is very specific Hannah," Miss Watkins reminded the petite blonde, "If any woman gets pregnant by a ponyboy she automatically becomes a ponygirl herself. I need to do a pregnancy test on you."
Before she had a chance to respond, Hannah felt a pair of strong hands on her shoulder and was instantly swung around. She was now facing her ponygirl Candy and held in place. With the muscular ponygirl holding Hannah Miss Watkins was able to effortlessly cuff Hannah's wrists behind her back. Candy bent over slightly and gave her owner a deep French kiss to quiet Hannah's screams as her wrists were secured behind her back.
Finally, Miss Watkins unlocked the gate and pulled Hannah out and pushing her into a nearby cage. Miss Watkins forced Hannah face down onto the floor and pushed a small plastic indicator under Hannah's slit. She smacked the girl's ass hard and said," Piss."
Sobbing, terrified and angry, Hannah released her muscles and pissed over the indicator as ordered. Taking the small plastic indicator, Miss Watkins, slapped Hannah's ass again then said, "Good girl."
Moments later the professor left the cage but kept Hannah inside cuffed and naked. Still sobbing Hannah stood up and slammed her petite and cuffed body against the gate. She looked over and saw her two ponies still kissing. She watched as Candy caressed her brother's still hard cock. "When I get out of here," Hannah screamed, "I will put both of you in chastity and I promise that neither of you will ever cum ever again."
Candy responded by getting up and straddling Cody's crotch and easing him into her again. She slowly and erotically pumped her brother's cock with her own wet slit as she blew a kiss to Hannah. Soon Candy could feel another orgasm growing from her brother's cock inside her and she began pumping faster. Under her she could see her brother straining against his restraints as she fucked him. Faster and yet faster Candy fucked her brother, she could see by the expression on his face that he was ready to explode into her again. Candy bent her muscular torso down and kissed her brother while still sliding her slit up and down his shaft. A second later the two ponies exploded together in a powerful and extremely satisfying orgasm for both of them.
Candy remained impaled on her brother's shaft for several long minutes so that she could enjoy feeling the last few throbs of his cock inside her. She then bent down and the two pony siblings kissed again. "Your pussy will never feel another orgasm as long as you live," Hannah screamed from the other cage.
Afterwards Candy fell asleep next to her brother, while Hannah slumped into the corner of the nearby cage sobbing. Eventually Hannah became exhausted from crying and fell asleep herself.
Sometime later Miss Watkins returned with the pony doctor and said, "Congratulations Hannah you are going to be a mommy."
Now fully awake Hannah stood in front of the gate crying, "Please let me talk to my parents they can fix this."
"I already spoke with your parents," Miss Watkins explained as she unlocked Hannah's gate, "Your parents are extremely upset by this but were not surprised since you are always making bad choices. Your father also said that he is finished fixing your mistakes and he won't fight to have you freed, and further said that being a ponygirl is probably the best thing for you. "
Hannah stared at the floor as the words seeped into her mind. She felt Miss Watkins take her by the arm and lead her out of the cage. Before leaving with Hannah Miss Watkins turned to Candy and Cody then said, "Hannah's family gifted you both to the University, so you will be under my control. After we finish turning Hannah into a permanent ponygirl we will put Cody back in chastity so I recommend you both fuck as much as possible until then."
As Miss Watkins and the doctor escorted Hannah to the pony clinic at the back of the barn, Candy and Cody smiled at each other. Candy wasted no time and quickly mounted her brother's cock again and fucked him wildly. For the next three hours the two ponies had nonstop sex. Candy fucked her brother like a machine making sure that his balls were completely emptied into her. When they were done, they both lost track of how many times they came. It didn't matter both were completely satisfied.
Eventually Miss Watkins returned with Hannah. The petite blonde was still naked and cuffed, with a metal posture collar locked around her neck. Her name and serial number tattooed on her face below her eye. She looked at the two ponies in the next cage and tried speak but when she opened her mouth barely a squeak came out. Tearfully she walked into her cage and knelt in the corner sobbing.
Next Miss Watkins cuffed Candy's wrists behind her back and secured her bent over into the enema bench. She then went back into the cage and wiped Cody's cock clean with a warm wash cloth. Naturally he got hard from her touch, but after squeezing his balls and slapping his cock Cody went limp again, which allowed the professor to lock his cock back into the metal chastity cage. She released Cody from the floor restraints only to cuff his wrists together behind his back like Candy. Moments later he was locked bent over into the enema bench next to his sister. The pony couple was fed their usual pony slop and each had their asses cleaned out by enemas, afterwards Miss Watkins secured their pony boots onto their feet. She let them both up and finally secured the bridals into each of their mouths. Miss Watkins then led them by their reigns to pony walker. She secured each pony to opposite poles so that they couldn't see each other as they were forced to walk.
As she watched them walk and gradually turned up the speed Miss Watkins spoke, "I am not sure what we will do with you yet. There are several offers to buy Cody, which we are considering. Until that time we will continue to race you both. If you continue to win races, we will continue to let you both fuck."
Soon the ponies were both forced to run in their pony boots and Miss Watkins casually walked away. The two ponies were forced to run for what seemed like hours. When Miss Watkins returned, she was leading Hannah, who was now wearing her own set of pony boots. Like the others Hannah had a pony bridal locked into her mouth with reigns attached. The professor slowed the pony walker to let them too cool down then finally stopped it. She then attached Hannah's reigns to the arm next to Cody and walked back to the controls. Hannah whimpered loudly as she stood tethered next to Cody. Moments later the walker started moving again and the three ponies were forced to walk.
Miss Watkins strolled beside Hannah to smack her ass with a buggy whip to keep the new ponygirl motivated. After a while she increased the speed and continued whipping Hannah. Although it wasn't as fast as Candy and Cody were used to, but it was extremely fast for Hannah.
The three ponies were forced to walk at the slow pace for almost four hours until the walker was finally stopped. Hannah's legs and feet were aching when Miss Watkins lead all three ponies to open corral and let them relax in the sun. Once Miss Watkins removed their bridles and left them Candy pressed Hannah against the unyielding fence and tripped the petite blonde forcing her to her knees. As she had done to countless other ponygirls before Candy pressed her smooth moist slit against Hannah's mouth and forced her former owner to lick her off.
Hannah refused at first and tried to get up but a few kicks to Hannah's thighs to remind the petite pony who was the alpha pony and Hannah was soon licking Candy to a wonderful orgasm. As she licked Hannah whimpered in frustration. She didn't want to be a ponygirl and desperately wanted to be free.
After Candy came three times, she let Hannah up and turned her attention to her brother. The pony couple pressed their bound bodies against each other and kissed passionately as Hannah could only watch and sob. When Miss Watkins returned, she led all three ponies to the main barn. She gave Hannah an enema and fed her some pony slope before locking her into her cage. She kept the bridles and reigns on the other two then hooked Candy and Cody side by side to their pony cart.
Once they were both secured to the cart Miss Watkins slipped a metal band around Candy's waist. At the front of the band was a narrow metal plate that perfectly curved over and covered her mound at the bottom of the plate it separated into two narrow metal stripes that went between her legs and continued up the outer edges of her ass cheeks then up to be locked onto the waist belt. As Miss Watkins secured the chastity belt around her, Candy could feel several rubber nubs pressing against her clit. "Since Cody is only allowed to cum when you both win," Miss Watkins explained, "It is only fair that you are only allowed to cum after you win as well."
Candy squealed from behind her bridal gag and struggled uneasily in her bonds. Tears rolled down the face of the ponygirl as the she realized that she won't be able to cum as much as she has been. The hormones in her pony slope increased her arousal. The bondage and naked pony bodies only added to that arousal.
Cody could feel the professor get aboard the cart and she took their reigns and smacked their backs with the buggy whip. Instantly the two ponies began pulling. She drove them to the running track and gave them a few warm up laps before she cracked the whip harder against their backs forcing them to run faster.