Your nap is broken up into short sleeps as the ache in muscles and joints is extreme. The pain becomes over time a catalyst for the human part of your mind to grasp as something. Like passing clouds over the sun on a Summer's day, thoughts come to you.
The odd thing about being changed from man to animal is the idea one is more free. You consider that during your life you looked at animals as free spirits to do and act as they might wish. However, you are an animal in body and being treated as such you are finding a truth here.
A truth which to this very moment had escaped your thought process. As one would live out their humanity the feeling of true freedom can not be reached. Some as you've seen even wish for bondage and dress up with harness straps and run about pulling wagons in the buff. These ways have been fine for others but you were more in control of your life than those people. You worked for years with the impression that at some point you would retire and find life as fulfilled somehow. Your bondage was working the daily grind, and being put in stressful situations.
The thought of being a pony volunteer was under the mistaken impression that you would be as if retired. A hope of nothing to do but play the role of a pony and stallion. Even the thought of animal sex had not entered your thoughts until placed with the mares in your stall.
Then the truth seemed to be known as this was as much a life of bondage as any other. How people hope to be free and then when the freedom gets boring the want turns to some type of bondage. Some choose drugs, gambaling, role playing, and there are those that chase animals about their pasture in hope of becoming one by some supernatural means.
How pleased you feel that this chance was offed to a volunteer. A willing person wishing to be treated as a beast and kept bound with chains and straps. You are one of the lucky ones to have been given this adventure.
The pains may ease as sleep comes again, tomorrow is another day of learning to be a pony true.