Obey and wear the collar

You put on the collar, and your powers are sealed. The man is the Stablemaster, with a gesture of his hand, the trap opens, he grabs the leash, and forces you to stand up and walk.

"Good choice" he says, and drags you through the gardens. He forces you to use an open-mouth gag with a bridle. You struggle, but a sharp tug on the lash silences any protest.

"Quiet now, little slut" he warns you pointing at the watch towers. "The guards can hear you, and it will be worse."
He ties your arms to your back and your legs to prevent you from running away, and forces you to enter the stables.

He forces you into a tight leather suit, the boots are heavy, and the material is stiff, locking your limbs in place. Every movement is a struggle and the leather is pressing hard against your ass and pussy.

"Enjoy the night" he says, and closes the door.
No matter how hard you try, the escape is impossible; you don't sleep, and the sun rises.

The man enters the stables, you are sweaty and tired. He adjusts the straps and immobilizes you, then he brings a creepy instrument with 3 metal rings. Piercings? it's can be serious!
Unfortunately, he's serious; you scream in pain when your nipples are pierced, and then you almost **** when he pierces your tongue. Then he forces you to drink a healing potion and your wounds are cured, but the degrading metal rings are in place. Crying and drooling through the metal gag you beg him to let you go, but you just babble.

The stablemaster attaches chains to your tongue, nipples and collar, restricting your movement even more and forcing you to bend your body.
He makes you walk outside, and ties you to a post. Then, he attaches a harness with ridiculous horse ears on your head and she shows you a big, long buttplug tail.

You struggle, ****, but you can barely move. Defeated and degraded, you feel the plug pressing against your anus, it stretches more and more, until it slides in, the pressure is overwhelming. The man adjusts the leather harness to secure the plug tail inside you and he spanks your butt. "Good girl, and now the saddle"
What? The saddle? You can't carry a human on your back, it's impossible.

He adjusts the saddle and puts some heavy sacks on it. Then it forces you to walk and to perform degrading tricks, like lifting your legs, and jump over obstacles.
The stablemaster feeds you every day, and if you struggle or try to speak, he whips you violently.

Day after day, he increases his weight, your legs are stronger, and after months of training, he rides you.
His rival is the strict girl who trains "mares" for the entertainment of the nobles, and you will help to defeat her.
You are exposed like a piece of art, the mare who can even serve as a real mount, and the stablemaster is rewarded.

Your life is hard and long, you serve as entertainment and you are never hungry or thirsty, however, the degradation is the price to avoid terrible punishments.

Bad ending
Trained like a mare ending