Tom came back to the stable with a breeding mount for horses. As a kid, Nick wasn't sure how to use that device, but something in it made him feel uncomfortable.
"Ok, this is our old breeding mount. Don't worry, it's clean." Tom smiled as he patted it a few times. "Now, it's up to you." Tom stared at Nick but the horse didn't seem to know what to do. "Ehem... You don't know how to use it, right? Uhm... Well, your dick goes inside here and you cum like always..." Tom stopped for a second and facepalmed. "How stupid! I forgot to bring it!"
Tom ran out of the stable while Nick kept staring at the mount. After hearing Tom's instructions, he remembered that he had seen a several dogs mating before. It's not like he wanted to see them, but dogs do it anywhere after all. The male on top of the female thrusting back and forward like if they were playing.
"This will help you!" Tom said as he came in with a big jar. Nick didn't know what was inside it, but it smelled so good that he felt the urge to came closer to smell it. "Calm down, boy! Let me put it in the mount first!" Tom opened the jar and with a rag he fully covered the mount hole.
Nick don't know why, but he felt way more interested in the mount know that it smelled so good to him. He approached it, his horse cock hanging between his hind legs. He sniffed the hole for a second before he suddenly jumped on the mount and inserted his cock inside it. He was having troubles with his balance at first, but he was doing a good job.
"This scent always works!" Tom grinned as he saw Nick's tail wagging. "Although I honestly thought that because of your human mind you will take a little bit longer."
After several minutes, Nick was still mounting the breeding device when the other horse riders came in over their horses.
"It seems that all the boys are ready for the race!" The older rider said.
"Wow! You convinced that guy to use the breeding mount?" The youngest rider said. "I barely managed to ride mine! This boy didn't want to become a horse after seeing yours!"
"Nick has been a good partner." Tom smiled. "I know he would do it great in the race!" Tom smile faded. "Too bad he'll be back to be a kid after that, he's an excellent stallion!"
"You know that only the winner will become a kid, don't you?" The old rider winked at Tom.
"No, I couldn't do that." Tom said, right at that moment he heard a loud whinny from Nick. He had finally shot his load and when he took off his dick from the mount, several drops of thick yellowish cum started to drip on the ground. "Wow! That was a big load!! You have made quite a mess!!"
If Nick could blush he would be red of shame right now. He immediately realized what he had done, Tom, the other riders and even the boys turned into horses had seen him mounting a breeding device like a common animal in heat. He had lost his senses for a moment, he wasn't sure when but he was really ashamed of his little self control.
"Tom, clean your horse and meet us at the horse court! The sun is setting!" The old horse rider said as he and the other rider left the stable.
"You did an excellent job, Nick!" Tom said as he used his old rag to clean Nick's shaft. "Thank you, you will give us a lot of magnificent colts to breed!" He mounted Nick and they both left the stable. "I won't disappoint you!"