Ignore her to protest and keep your dignity

Furious because of your defiance, the swine lady secures your body to a horse breeder and calls their most brutal stallions to take care of you.
She starts recording the whole process and says that soon, you will ask her for mercy and show you a little surprise.

You are completely nude, with a collar and a leash and you notice the first horse taking position... You feel how she is pouring some king of slimy grease on your butt, and after a few moments, you feel the huge cock of the beast poking your ass. You clench your teeth, enduring the pain and the humiliation, you don't want to satisfy her and show your pain... however, the cock violently slides in and you let escape a moan.
"Good, I love it, try to endure it..." she laughs "We will see the final results in a few days"

You serve multiple horses every day and you feel your belly full of their filthy semen, the swine girl makes a mark on your body for each beast that cums inside your ass. After 2 days, you notice something curious, your belly hurts and you have a weird sensation, like if you need to poo, but you can't... she puts a bucket under your mouth and says that the show will start soon.

Completely sick, you feel nausea and you think that you are going to throw up... however, you cough and spit a whiteish substance in the bucket. It's semen?? what's happening??
You have more nausea, and you cough again, more of the sticky white substance... this time there is no doubt, you spit horse semen! horrified and sick, you cough one last time and with a disgusting sound, you finish to fill the first bucket.

"Good boy, do you like my surprise?" she says holding your head. You are weakened, and sick and can't endure more, this is too much. "Congratulations, you expelled the first cumshot, there is only 49 more left"
She explains that she cursed your body, and you will eat horse cum from your ass, and you will expel it from your mouth, the swine girl stores the full bucket and puts an empty one just below your mouth.
Sick and broken, you try to beg her but the nausea starts again and you start to fill the second bucket.
"Calm down, we will talk when you finish" she says laughing and softly spanking your ass "We must empty your full belly first"

No matter how much you beg her, you are condemned to eat cum from your ass and expel it from your mouth, creating a unique pure horse semen for many many years until your body fails and you finally find the eternal rest.

THE END
Semen "all the way through" ending