Stepping along at a trot, what you are seems completely natural, although having the bulk weight on your back lends to a sense of being uncomfortable. The insistent nudges or kicking sensations along your belly tends to nag at you as much scares you, spurring you to continue moving in a forward direction. The leather straps of the head halter and that nasty tasting steel bit set behind your front teeth is as well a pain you would delighted by it going away.
"Hee-Haw," You cry, wishing to all that is holy that you could gain some understanding about why you feel something is dreadfully wrong, and at the same time comes the odd idea that what you are doing is perfectly proper.
A harsh kick again in the ribs sends you trotting along the time worn hard road, your hoofs lifting into the air some dusty dirt, the dust clinging to your sweaty hide and body fur. The continuing urges to keep on trotting, carrying that man above, he, him who is seated on your back..., him, your new master?
The yanking back of the steel bit in your mouth is enough of a discomfort that it breaks your thinking about trotting, as you slow to a walk.
"You are doing quite well my new mount," says the man above. "The man..., master, he who you met not so long ago and what he did, made of you, changing you, your body!
"Whoa..., we shall stop and let you rest, and you may get a drink from the yonder stream." Said the Man!
Walking a slow ambling stride to the stream, you lowered you head, your muzzle to begin taking a well deserved, as needed refreshing drink, your furry self lathered with sweat from the past miles of trotting along the road.
A look at the slow moving water in the stream allows your view of it to see a rank face of one beast of burden seemingly standing over you, as it is drinking from the same place along the stream bank.
"Huh," you muster the exclaimed grunting sound as lifting your head you expected to see the beast as well jump and move away, but there is no other beast there, just you.
"Ha, ha, ha, ha..., you thought you saw a tawny looking brute animal in the water reflections, but that beast is you. I think its time spent enough of you learning your proper place, that you begin recalling of what you were, and knowing then of what I made you to be for me." Said the man seated near a large tree.
"Hee-Haw..., snort," you say, you, no me, me is I and I is me, but this animal was not me? Who are you, and what exactly am I, as what I see of me and feel seems not righteous. I am naked! Where are my clothes, my things, what have you done with them, you stole them, and for why then leave me as being naked?" You as then me and I did ask.
The man reaches into a pocket and retrieves from it a gold colored pocket watch as he pops it open to check the time of day.
"Well it seems righteous that you know now the truth about the new you. If you think real hard and recall when we met, you stood like I would, as on two legs and wearing shoes, are you wearing shoes now? No huh, well donkey mules do not wear clothes or shoes, unless the iron made shoe were nailed to the bottom of your hoofs.
I had a dire need for a pack animal and a suitable mount to carry me through this up and down terrain. You happened along and being from what I could read in your mind as thinking of yourself as but a mere meager young man, I decided to gift to you a body and life of useful purpose. Even your lack to sexual self esteem said you would make a worthy subject for becoming a donkey mule. So I made of your human body the brute form of a mammoth size donkey, but castrated, you being a Mule to ensure your continued good temperament.
You are responding to what I have said by the usual method given to a male equine, you are becoming sexually aroused, you cock is coming from the sheath, it hanging limp but bloated. You should keep those horny hormones going, as gain next a full, stiff erection of that mighty size mule's cock.
You are sterile, I left out the changing of your manly balls to make you as a cut, castrated male Mule.
Oh but when we arrive to where I need to go and you mingle with the mares in a corral, you might sniff a horny mare, and try then mounting her, but do not expect the sensation of a bold release of semen, because you have not the balls to be a stud!" He said, him the Master, and a Warlock, being someone you should fear as well as dislike for what he made of you to be.
Hee-Haw, I, I can talk, oh thank you, I have so much bottled up in me I would beg to ask. As more than of what you have told me, of me working for you, this hopefully temporary, animalistic embodiment, I would wish to ask a few questions?
Why, I do not know but my being as such a large male Mule, though sterile does not bother me for what I am, as I feel oddly content being for you a Mule animal?
Oh and one thing more, you are very correct, as my bolstering an erection, the weight of my cock hanging from my sheath, my groin is as much a delight, almost of it worthy for my to remain then permanently as this animal, being my body, lifestyle and future."
"Ha, ha, you are feeling the sensual elation most changelings feel, as the longer you remain in an animal form, the more comforting it shall become, until, say after a month of time, you would beg me of you to stay as my animal. Do as I need have you do and I promise, that when we reach my destination, I will grant back to you your male testicles, and improve your state to being a prime sire stud donkey.
Is being a male animal used only for a stud to mate mares, jennet donkeys, and the occasional perverted human who would come to worship your great cock then enough of a lifetime prospect, that you retaining, remain then as is a male animal and be silent about me and my dealings?"