This was a fantasy/desire of mine. I wanted to make it happen, but I never managed to find the ideal slave to execute it.
Well until recently...
I'll try to describe it in words the best I can.

About 6 months ago, I recieved a msg. form someone. A pony wannabe, slave-woman claiming to be...
She wanted "environment" to explore it's inner I.
At this time I wasn't very busy, so I send her some pics of my howsehold and gave her specs for IM.
At the preset date and hour she was on line. We talked a little and I understood, that she is also in kidnap, rape, forced submission etr., etr., "relationship dynamic". I've got her real photos and contact info. Send her a contract and she returned it to me signed, whit a photo of her holding her ID in one hand and the contract in the other, as ordered.
Whit that info I got a van, prepared myself and went on a "hunting trip". Soon I was was at her location, prepearing my "homework". She worked as waitres in a shitty restaurant. Lived alone with not many friends. After a couple of days, I've got my hands over her. In a matter of seconds, the slave was captured, tied up, gaged in the back of the van. Then I went in to her apartment. Took all the nececcary things. Personal documents, cash, laptop, and dressess I thought, I may like. After a hour of driving, on a lonly parking lot, I declared this slave mine, let her say its words, kiss my feet, lick my ass and then I violated her anally. With minimal precaution, preparation and gentleness. This slave, claimed to be an anal virgin before. Well I'm not sure about that, but she wasn't afterwards. Then I collared her with a training collar, made of simple elastic steal band whit a holes for the lock and O-ring with SLRN tag. Then I put on her a chastity belt. She was weeping silently. I ordered to stop! She didn't. I flogged her, until she stopped. At the next evening I flogged her again and made her to call everyone in its phone book and to tell them some excuse to search for the woman they used to know no more. Even then I was pleasantly surprised how this slave managed never to use: I, me, mine.
On the next morning I locked the sleeping slave in its cage in my dungeon.
Something told me that I've got a natural born slave woman in front of me.
I was thrilled from the possibilities.
I didn't wanted to brainwash this slave woman. From experience I know it will be effective way to design it. But also it would wipe out the smile off her face and every sort of resistance. This is not what I had in mind. I had a bigger plans.
I let her sleep for now.
In the next 45 days, this slave passed with flying collours the basic training of:
Mare Taming and Breaking
Rules
Eye contact restr-ons
Obedience
Positions
Physical Training (it had to loose some weight by my standards)
Ass play
Blow jobs
Bondage
Canes,
Leashes,
Humiliation

After a exam, I locked a polished, titanium "Talena" collar, for this slave "consideration" collar and continued with:
Mare Training
Dress code
Public behavior
Dance and model classes
Mental bondage
Auto (instinctive) submission
Pleasure & pain
Subaru
Elements of Gorean Lifestyle
It received a new breasts.
It is pierced with the gold O-rings in the clit, nipples and nose. Have tattoos of "kalef" high on her left leg and a slave bar code behind her scull. I'm considering branding its pelvics unfortunately I can't find a branding method precise enough for what I have in mind.

...

I was up early in the morning. At the sunrise. Made myself a cup of coffee and enjoyed it, making plans how exactly to spend my day.
When I was ready I went to my special "stables" were one very special animal is yet sleeping, bounded with a locked collar and a chain to a concrete traverse, covered only whit a broken hear. The key for its collar is welded to my watch. And the key for the chain lock is hanged there, in front of it, but just outside of its reach. This had a great re-educational effect as I discovered. Helps to induct understanding of the the ones place and role. This grinds up all desire to resist me very fast.
This mare, in the beginning, did tried to give me a hard times. It was somehow, "hard-mouthed" due to all the wrong education and fake moral postulates given to it until it was a little one. But nothing which some precise "explanation" and short bridle can't correct.
I take my whip. Its time for the morning ride of this mare. I unlock it and take it to the garden ...

She gently waves her blond mane accepting, adjusting herself to the bridle. At the beginning this animal didn't felt very well to the tight bridle, but now, after so many exercises, it's getting more and more used to it. I know that she is even starting to like it. This instrument, for losing control of it's own body and thoughts, can be so liberating and calming. She starts to understand that.The total helplessness to act as told, is a very powerful tool for building the desired slave woman. The slave, she enjoys and likes to be ...
I put on two anklets connected with a short chain. I don't want her to "run" too much today. Can you imagine the pure beauty and emotion of seeing such animal. Trained to perfection no, to artisticism, build to be the masterpiece of my efforts. Created to be perfect object of pure emotion and desire. Standing there, in the middle of the garden in minimal gear, yet well restrained, on all fours, under the rays of the rising sun which are playing colours whit its blond mane. It makes eyes hurt.

I stand behind her, take the bridle and switch the chain around my left arm. Holding it tight I carres her face and back. "Easy now. Everything's fine." I calm her with mi genteelest voice. She never knows exactly what's to follow. This state, of constant uncertainty, makes her like a plastic in my hands. Learning to submit to any push. I step over the anklet chain, blocking her feet.
Suddenly I enter her anally whit all my length. The surprise it full. Simultaneously, I pull up my left hand, lifting her on its knees, twisting its spine. She, loosing the balance, makes instinctive attempt to go away from the pain, rapidly understanding that her legs are blocked by the ankles. Simultaneously she tries to loosen the choking bridle, knowing very well that this is impossible and forbidden. I grab her right arm and twist it behind her back. "Caress yourself!" I command her and this leads to the moment of hesitation. From one side of the pain and surprise, from the other of the pleasure and my training. In less than 0.2 seconds, my traning owerwellms and she sticks her left hand between her legs.

Some "Doms" use to put anal plugs to stretch the entrance, but I don't follow that practice. Actually, I like the sense of violating my slaves causing pain and disturbance through tight asses.

I trust several times good and she relaxes and adjusts herself to me. This slave woman knows my "member" quite well and knows that despite the pain the best, she actually can do, is to "push" a little. Now I let her fall and after a couple slaps whit the whip I give the command and she starts to trust on me by herself, following the commands of the bridle, lightly like a feather, leaving me to play whit her breasts, hair and pussy.

I consider using  the O-ring in her nose, as a replacement of the pony bit, doing the same job and is much more "elegant" so can be wearied everywhere...

When I finish, I'm thinking to myself: "- O yes, soon it'll be totality ready. Soon it will be perfect enough to be the "jewel in every man household" - the perfect mare slave-woman. Soon her chains will become a "noble" ones!"

But later I give her the 10 flogs. After all she touched her restrains...