Equus slowly walked up to the female. He positioned himself so that his floppy cock was directly in her face. The male was passed out to her right, his head resting on a pile of discarded helmets. Equus bent forward and tickled Jules ear until she woke. Not completely, but just enough to register that someone had their cock in her face, and she needed to start sucking.
"Already Mark? That was fast." she mumbled. Jules slide her mouth over Equus' thick cock, not even realizing that this cock was far too big and smelly to be Mark's. All the same, she started sucking as much of it as she could. As she did, her face stretched out until Jules was able to engulf over half of the horsecock. Fine hair spread from the top of her head to the end of her new muzzle.
Jules pulled off Equus' and snorted. Her nostrils much larger now, she was able to smell things she couldn't have while human. Like her own arousal. She NEEDED him. Jules turned around, careful not to disturb the sleeping human beside her. Her tail had started to grow, the beginning of long hairs poking through the skin near her tailbone. Jules feet had collapsed on themselves, slowly turning into hooves.
Her hands were more like pseudohooves, three thick fingers tipped with black keratin. Her breasts had bloated until they were an H cup. Jules thrust her ass backwards, rubbing her thick black nips against the floor at the same time. She whickered in pleasure as her pussy and asshole expanded. They both puffed up, as the skin became black. Her huge, furred ass shook as Equus entered her folds. His cock had no trouble sliding inside Jules' sopping cunt.
She whinnied louder as Equus began to pump in and out. There was a loud, wet smacking as his balls hit Jules' ass. Everything came to a climax as Jules' ears and neck lengthened, and her mane flourished. As Equus came, he looked down at the new bay mare beneath him. She was beautiful, and couldn't stop clenching and unclenching her pussy as she too came.
But more importantly, Equus knew she was his to control. And as soon as he was finished, Equus pulled out and gave Jules an order. Which she was more than happy to follow. She crawled over to Mark, and began to suck him off. His cock was still human, so Jules had no trouble engulfing all of it with her horse muzzle.
Mark, still very much asleep, moaned as his erection throbbed. The skin of his cock was darkening, and his pubic hair was spreading from his groin to his thighs and stomach. Jules could feel his cock inflating in her mouth. The head deformed, flattening and gaining a distinct flare.
She could taste the pre changing from human to equine. Jules popped her mouth off Mark's growing horsecock, and waited for him to regain consciousness. Mark continued to moan as his changes progressed. His ears stretched, as did his face. His nose and lips fused, and like his cock, the skin became darker. Unlike Jules, Mark had grown a chestnut pelt of hair. His new hooves clopped against the floor as his erection pounded. At its full size, Mark's horsecock was just under three feet long. His balls looked like black tennis balls. The wiry public hair soon shrank to a fine layer of brown hairs over wrinkly black skin.
Jules watched hungrily, eager to test Mark's new cock. He finally snapped his eyes open, overcome by the sudden heat in his chest. He saw Jules, her legs spread to present her black twat. Mark didn't hesitate to approach on shaky hooves. He bent her backwards, and slid his dick inside. The head of his cock pressed against Jules lips, and as she unclenched, Mark drove himself inside.
Equus hung his cock over Jules head, and she began to suck it again. Mark continued his erratic humping, his tail shooting from behind him as her came. Jules whinnied, and then gagged as Equus came in her mouth. She was being filled from both ends.
Equus backed up and examined the first of his new horses. Mark and Jules were both getting back to their hooves, and awaited their next order. Both sporting the genitalia of a well endowed stallion and mare respectively.