Beep, beep, beep, beep, beep, beep, chimed Brad's Apple watch.
"Time to check Chad's recovery and capacity for the last time, but don't worry, Rob, I'll be back to let you test mine," Brad said swatting Rob's bare ass.
Brad gently rubbed Chad's neck, back and flank before sitting down on the small stool to massage Chad's balls.
"This is the last time, Chad, so give me all the little swimmers you got. That's it Chad," Brad said as spurts of semen filled the collection jar. Rob yawned and glanced at his watch.
Oh, fuck, he thought, I should've given Chad his booster shot a couple hours ago. He hurriedly pulled on his clothes, and ran to the locked refrigerator in the infirmary.
"Be right back, Brad," he shouted in passing.
Brad giggled to himself. His big penis had induced toilet runs in lots of guys.
Rob only noticed when he was in the infirmary that he was wearing Brad's shirt, he sniffed it. Then opened the refrigerator, and took out the numbered syringe for Chad. Then his bowels started to churn. He locked the fridge, set the syringe on the counter, and ducked into the bathroom. Brad had really loosened Rob up.
Meanwhile, Brad started to feel kinky hairs jabbing his arms. Chad was sprouting blond public hairs while Brad worked to drain his penis. Brad stared he'd never seen pubes on a horse before. Then he noticed the horse penis was shrinking in his hand. It was still erect, but it's size and shape now more closely resembled Brad's own. Brad switched to a new collection jar, and drained the dark horse balls as they became hairy pink human ones. He stepped back put a lid on the last jar, and stowed it in the refrigerated cooler with the other samples after numbering it and noting time and animal. The horsetail was disappearing being absorbed into the animal's spine.
"Chad, what's happening to you?"
The horse turned its head, now displaying blue eyes which were formerly brown. He opened his mouth, and said in a deep voice, "Brad?"
Rob appeared and empty the large syringe into Chad's flank.
The horse said, "Ouch! That hurt!"
"Rob, what the hell's going on with that horse?"
"I kinda forgot his daily booster shot until now. Sorry you had to see that, Brad."
"What the hell did I see?" Confused Brad asked, "the cock and balls, and the eyes were human."
"Look again, Chad's almost completely himself again. All horse, see."
"So is it really a horse?"
"It will be in a week or so after all the booster shots. The shots stabilizethe equine form as the new default body," Rob explained. "All the tests you took should come back equine, the boss said. See this punk guy crossed my boss, and well, heh, heh, the boss decided to stable him instead. Shots stabilize the former and future stud now stabled," Rob added brightly at his attempted pun.
"So who is the guy?"
"Was," Rob corrected, "some guy who slept with boss's girlfriend. Hence the stud reference. Boss was going to geld him, but he figured if he's got stud value, he might as well use that. When do you think your father's recommendation will be ready, Brad?"
"Based on capacity, I'd say he'll say stud. But he'll wait until all test come back. If his sperm are defective - like part human- I'd say geld. But there are other genetic tests. You don't think the samples will change human too do you?"
"Hm? Hadn't thought of that. Will have to ask the boss. You better go."
"But this horse is a human being?"
"Was, and I don't know if his real name was Chad or not. His paperwork said "Chad", so that's what I called him."
"My brother's name is Chad. He's blond, blue eyed, and has a package like mine," Brad said nervously connecting the dots.
"Doubt it's him. Why would the boss call his own family to uh inspect him? Though come to think of it, I don't think he tried kicking any of you. Me, he gave me a peck of bruises when he first arrived," Rob said. "Forget about this Brad. Don't want you residing in the next stall. Give your bro a call, I'm sure he ain't the same Chad as this 'un."
"I would except, he's off at some friend's. Off the grid for two weeks. Said his friend wanted to take him horseback riding."
Rob looked at Chad, then Brad, and rolled his eyes. How did he get into these situations?
Chad zoned out, as the serum went to work stabilizing his horse metabolism. He couldn't understand their human speech anymore. He contented himself with licking the salt luck, as his mind went blank.