The end.

The days began to blend together, one into the next. There was only one way to monitor time, and that was the milkings, but by the end of the second one you had forgotten how many came each day. With nothing to pass the time besides masturbation, needless to say you became rather practiced at it, and would often simply go from orgasm to orgasm in the time between milking sessions, the excessively large dildos simply making sure that the gaping hole of your pussy stayed well stretched out.

Over time, there were naturally some changes. The succubus visited early and often during the first few months, checking the progress of your pregnancy. When you eventually gave birth to a brood of Ceceliae, your only disappointment was that your children didn't try to fuck you before they scurried off in search of water. After that, the succubus's visits were less frequent, but she still came- at least, whenever she had a new potion or serum to test. They usually involved growing some sort of body part- you quickly lost track of the amount of times you would end up fucking the succubus with a brand new cock- but at first, there were no permanent side effects.

Eventually, though, the serums became more and more complex, as your anatomy had shifted so much from the experiments, and she stopped caring about keeping you healthy or sane. At a point, she stopped being able to turn you back to a human at all, so instead she would have you grow cow parts in the hopes that it overwrote the previous effect. This managed to work until the point where she found new livestock to test on, but you had already had your tail turned into the long, thin one of a cow with a small tuft of black hair at the end. Not to mention the short cow horns, massive ears, or the overall black-and-white spots pattern that your skin changed into.

Your first human contact would come when an adventurer barged into the stables, several years after you were captured. Tall, fair skinned, and wearing a chainmail bikini, what little that was left of your mind had hope when she opened your door, only to be loudly reminded of the cursed bell around your neck. She tried to get you out regardless, but only succeeded in being captured as well, and a few days later she was your new permanent roommate, with a quartet of heavily lactating nipples of her own, and a cunt that you would eventually stretch out to similar levels as your own.

The two of you stayed in that cell, alternating between being milked by the machine and fucking each other, far past the succubus's eventual demise at the hands of a demon-possessed human. At some point, the bells were even broken, allowing you freedom, but you and your roommate "Mooo" only had one thing in your minds, and so you chose to stay living like that until both of you ran out your eventual lives.

The End