"I shall be a what and where, a Faun, like some fully formed deer to wander about grazing and being a part and property of the Park?" you ask, your question seems sound and the answer is likely.
"Not quite," comes the answer, "A faun as in being partially animal and mostly human, a Faun is the blending of you with the more sensual side of a breed of nanny goat." The man answers, he seems to think you would rather be like a nanny goat than to become as a jennet donkey.
He points to a chalkboard and does a quick outline of what you and your silhouetted' shadow should match one with the other.
Uncertain and feeling as you would rather return home, the man gives you no further time to contemplate the issue; he suddenly injects the contents of a syringe into your shoulder.
"Ouch!" You yell, your arm burns where the injection entered, as a wave of warmth and a sense of personal arousal gives way to your feeling damp, then wet, and near sopping.
"Now you can go out into the corridor and await there for the matron to walk you to where the more drastic changes shall most certainly occur." The man announces what shall come, as you did sign the wavier, granting the Park a power of attorney over you and your physical form.
Staggered steps to the door and you turn to give the man your most dismayed remark. He looks up at you standing by the door, he smiles, and informs you that the transition of species has begun.