First Damon's grayish hide and fur was change into a white hide and fur as it cover him up.
His face changes from a Donkey snout to a horses snout. His hair then grew down into his new mane.
He then grew a little taller to that of a horses size. His donkey tail then changes into a horses tail.
Damon see that he was now a full horse. But he felt something else that change as well.
He looks down and see his cock goes into his body and was replace with his new horse Vigina.
Circe had change him into a Mare. Damon just look at Circe who wasn't very happy with her choice. Circe could see it.
"Hey you agree that I can change you into either a Stallion or mare. Do you want to go back to being a Donkey?"
Damon shook his head. "Okay then. Let's get you our of here" Circe opens the gate as Damon goes out and Circe closes it back up.
She then takes Damon to the other horses.