Tony came to sucking on a huge, fat horse cock. It belonged to a large black breeder who look like he was Frisian with long black feathers. Somehow the face looked familiar. His cock was burred in another pony boy. Interestingly Tony noted no one was in his ass, so this must not be breeder training.
Then Max's voice came to him, "Hi Tony, this is actually your first round of racer training, you see they have to get more drugs, food, and nanites into you to further your changes. In that sense, this is like the breeder training. Now for the good news. That beautiful stud you are sucking off is based on what Roger is going to look like when he's done. He'll be servicing you all through your treatment."
Tony almost choked on the stream of medical cum. This is amazing. Tony examined the Frisian breeder in minute detail. He was black, had a cock at least 2' long, and was very beautiful. He smiled around the huge cock in his mouth. Tony sucked the horse cock harder.
Unexpectedly Roger's voice then came through. "Tony, aren't I going to be beautiful? I love you Tony. Suck me. Suck as hard as you can. The more of this you take in, the further the doctors can go. Suck me and keep sucking. I love you stud...." As with the breeder training, this went on a long loop during the treatment.
---
Roger came to overwhelmed by sensations, He was fucking a pony boy and being fucked, and being fucked in the ass by another. He was sucking off a third pony boy just like Tony described. The third pony boy got his attention. He was chestnut, slim but powerful build, and the face...Roger realized it was Tony grinning at him.
"Hey Roger, how ya do'in stud? You like how the docs have me feeding you? Suck me as hard as you can. Practice for later. I want you to suck so much we can both get the maximum transition. I'm going to be a stud racer and my best friend and mate is going to be the ultimate stud breeder. Suck me hard! Drain me dry dude! Make me proud!....." This long running script also ran and repeated for Roger.
---
"Alright, let's bring this research meeting to order." Dr. Kenworth began. "Dr. Taji, how are we doing with the two research subjects so far?"
Dr. Taji stood, cleared his throat and began. "We are presently 4 days into the experimental treatment. The rate of medical uptake is 30% above normal for both subjects. It appears the motivational scripts are working better than anticipated. As a result I have given extra nanite injections to both subjects so that the experimental hoof and ear treatments can be done. Tony's hoof and ear modifications formed during his breeder session today. Care will need to be taken with subject Tony due to hoof fragility for the initial running workouts starting tomorrow. This is not an issue with subject Roger as he is in full breeder training, and thus immobile."
"How are we looking as far as body mass?" Dr. Kenworth asked.
"Both subjects are exceptional. Subject Tony has 20% more muscle and is several inches taller than your typical racer due to the breeder addition. He currently stands 6'5", weight 230, with a penile length of 18.5 inches. We expect him to finish out at 6'7" with a final penial length of 19.5 inches. We won't know for sure till he starts his sprint training, but he looks very promising. Subject Roger is currently 6'8", 280 pounds with a penis length of 22". We expect him to finish out at 7', 295 pounds with a penile length of 25"."
"Very good. It sounds like everything is going well. We'll meet again tomorrow."
---
Tony awoke in a hospital bed with Dr. Kenworth standing over him. "Good morning Tony, how are you?"
"I feel great doc. I admit I'm surprised to be talking to you. Is everything ok?"
Dr. Kenworth chuckled. "You're right, it's not normal for me to talk with the patients. You are a voluntary research patient, so we have to do some special things. Your hooves are very fragile at the moment."
"Hooves?" Tony grinned. This was better than he hoped.
"Yes, I need you to work with me so we can start your sprint training and get your muscles used to running."
Dr. Kenworth helped Tony off the bed and into a device like a gazelle freestyle that locked his new hooves in place, then had him run in the device for 3 hours. The doctor took careful note of the readings from the device as Tony worked and sweated. It felt great to run, even in this strange manner, and use his muscles.
The running sessions continued over the next three days for Tony as Roger finished out his breeder treatment.