Steve showed up at 2 PM and found Dan waiting with a really hot girl, who looked Steve up and down and smiled.
"Glad you came, Steve. So before we do this are you wanting to be changed back afterwards or just another costume?"
"I thought you said you wouldn't change me back? Dan, this is ridiculous. I just came to see what the hell you're talking about. Just do whatever."
"I meant after the production is over, so you're saying we can use you for the season? So you're okay with this play, then?"
"Yea, sure Dan, whatever...aghck!" Steve was frozen and couldn't move.
Not sure what was happening he felt his shoes get tight around his feet and suddenly become hard and tight, forming into hooves. His feet cracked and stretched inside in agonizing pain while his hips became numb as he felt them pushing outwards, becoming wider and wider. His heels continued to lengthen and push back while his pants suddenly felt stuck to his skin and getting fuzzy. Steve's spine stretched and swelled up, and he felt his nipples harden and swell. His hips continued to swell and fill out, engulfing his hips and spreading up his body as his nipples became nestled between his legs.
"Dan, he still has a cock; I'm not going to have a boy horse costume," said the hot girl.
"Don't worry, he will fit you perfectly in a moment," said Dan.
'Holy hell,' thought Steve, still unable to move on his own but feeling his body arch forward. Suddenly his cock was being crushed up inside of himself as his jeans continued to become tighter and tighter, his hips wider and wider, and his ass wetter and wetter.
Steve's mouth started to drop down as if his head was melting, and his arms felt rubbery. His hair grew longer and his eyes were absorbed into his face. HIs hair became a mane as his mouth stretched open even farther, becoming a large opening and his arms hollow for the insertion of someone else's legs. His hair continued to send a tingle down his back to his rear, where a tail began to push and grow out from his ass. He noticed a cool wetness in his end, realizing his cock and balls had become a vagina and ovaries inside of him, and a vagina had formed below his ass.
Steve collapsed to the ground, a living female horse body sized for a human to wear as a costume.
The hot girl picked up Steve and put her legs through his opening, his mouth, feeling her legs go into him and down his throat, and then into his arms-now-changed to front horse legs. His mouth opening and mane went up to the hot girl's mid back. He was a costume, but realized when the girl wore him his back end worked like a real, living horse's body.
"He's great, Dan. Or should I say 'she's' great. So, let's rehearse ... "