As the attendant lead them into the fields she told them that they should stay away from the animals right now. They were a bit skittish around humans being in their enclosure, so they would be staying away from them while they looked for Sam. There wasn't any signs of him as they looked around though which worried the couple a little.
"Are you sure this is where he was?" The Attendant asked.
"Yes, I'm sure," Vivian said as her clothes were straining against her changing body. Her hair had become a long black mane and a tail was sprouting out of her rear but she didn't realize anything was different even as her clothes tore. "You know how foals are, they're always getting into trouble."
Derrick briefly paused a moment at the use of the word foal, but as he kept walking and his own changes overtook him he didn't think too much about it. Their colt was somewhere in the enclosure, that wasn't much a surprise since it was their home. He smiled as he looked over at where his mate was, she gave him a smile back as she swished her tail a little.
"Well you two, I'm sure he'll turn up fine," the attendant said as she smiled down at Derrick's sheathed cock, the two were coming along nicely. "How about I go look for him some more, and you two relax for a few minutes?"
The two horses to be nodded as the attendant walked off. She took out her phone as she turned on the perception filter and signals hit their brains which suppressed their memories of Sam. Whether or not that was going to be permanent depended on how things went with the colt, she didn't have a lot of time before it was too late and he was imprinted on the mare.
Derrick and Vivian didn't waste much time as Vivian moved onto all fours and shifted her tail to the side to show her new horse vagina. She smiled back at him while her face was pushing out, the smell of her vagina was driving the stallion wild as his cock slipped out of its sheath.
"Come on stud, take your mare," she said as she wiggled her butt at him more.