The girls high-fived each other when Madame Illusia pointed them out. "Would you like to join me on stage, and help direct his further changes?"
The two girls jumped up on stage, and find it hard to talk to her, constantly being distracted, as their gaze keeps going to the huge member hanging from the new stallion.
The girls suggested that his cock be extended even longer than normal for a horse. As she obliged the girls asses grew wider and fuller, but they remained oblivious to the changes. However the audience saw the change taking place.
When they suggested a thicker mane, and longer tail she obliged them again. This time they also gained a new tail each. One of the girls heard the laughter from the crowd, and when she turned to shout abuse at them she spotted her friend's new tail. She desperately sought and found her own tail. She shrieked and jumped at Madame Illusia, her cry turning into a high-pitched whinny.
Madame Illusia cast another spell on the two girls leaving them fixed to the spot. However the changes accelerated, and soon the girls burst out of their clothes as their bellies burst their skirts and expanded shoulders left their blouses lying in tatters on the stage. They fell forward onto their fore hooves, looking sadly between each other the crowd and Madame Illusia.
"I think I'll let you keep your humanity." she laughed as the two stupid, horny girls didn't yet realise what a burden that would become. They stood on the stage thankful for keeping their memories, trying to thank her the girls just let out a brief neigh, before falling silent.
Brian fulfilled his role on the stage covering first one girl, and then the other with a few passionless thrusts. Already the girls wished they hadn't made any changes as his extended stallion-hood filled them almost painfully. The excess semen slipped from their pussies, and landed with a sad -splot- on the stage. The three horses soon found themselves in bridles and led from the stage.
However the two girls kept looking backwards hoping that it was all some sort of joke, and hoping it would end soon. It took them almost a week for both of them to know in their hearts the finality of their situation. Every meal was a boring mix of dried food and water. By that time they had been covered by more stallions, finding every experience more and more humiliating.