The zebra priest's chanting gets louder and louder, his orgasm rapidly approaching as pre squirts out onto Ty's cheeks. He finishes the chant and starts shooting ropes of cum all around soaking the ground below him. "You shall not be drench with my seed, for you will become a stallion! Proceed to the cum trough for your transformation!"
"Th-thank you!" Ty smiles and stands on his feet, bowing to the priest before going to the cumming trough where other captured humans were kneeling at. Upon reaching his destination he saw three stallions standing above it, two of the furiously pumping more jizz into the cum trough while the 3rd one stood behind the four human males who were furiously masturbating as well. Ty took his spot and knelt down and started slowly stroking himself, waiting for the equine's instructions.
"Drink up, humans!" The stallion behind the five males commanded, the two stallions neighing loudly as they shot their last ropes of jizz into the cum trough. The four humans including Ty stuck their heads in the trough and started taking handfulls of cum to gulp it down until all their bellies felt full. They all move their heads back up with loud moans and groans as the transformation began, though the speed of the change varied between the humans. The man on the farthest side from Ty immediately started to transform at a rapid pace, screaming loudly in pain before it turned into pleasure. The new stallion neighs like a feral animal, getting up fast and sprints off into the camp to find a hole to fill. Another human male would groan in ecstasy as his face contorts and expands into a horse's, his transformation only going at half speed compared to the previous one.
"I..I can't feel anythi-" Ty began to say, before moaning loudly as his cock slowly expands, watching in amazement as his shaft reaches a solid 12 inches in length before it starts molting into a equine's cock. "F-fuuuuuck!"
"Y-YESSS!" A 20 year old male next to Ty was halfway done with his transformation, the lower half of his body was already sporting hooves and a horse cock. All of a sudden he lunges at the other man next to him and starts raping him, their change causing the act to be a pure act of pleasure. They get dragged off by the other two stallions once their transformation was complete, only leaving Ty and another male around his age left. The other male was jacking off his new horse-cock furiously so much that his jizz sprayed all over the trough and getting some of it on Ty. He stands up and stomps his hooves as his face contorts into a horses as well, making Ty do the same once his feet and legs change as well.
"Aaa-aaarrrgghhh-" Ty groans as his own face expands as short black fur grows all over his body. His ears grew and flicker a few times, and after a long minute his head was like a stallion's. Finally he stops growing at six and a half feet in height and his muscles gain respectfully with mass. Ty's transformation into a stallion completed itself when his tail sprouted out above his rear, shooting thick ropes of cum out of his horse cock. "NNNEEEEEIIIIGGGGGHHHHHH!!!"
"Welcome to the horde, brothers!" The stallion behind Ty neighs as well and pats the other's back a few times, watching the two new stallions stroke their cocks and cum bucket loads into the trough. After a solid minute of cumming, Ty and the other stallion took a quick break to catch their breath, both groaning with satisfaction.