Curvy Anthro Twilight

Twilight fought hard when humans invaded her home, and even after she was beaten and enslaved alongside the other ponies, she learned her place through proper training and is now a submissive, obedient pet. She even got to enjoy it, and since playing nice for her human masters allowed her to get access to books and some limited low-level magic, she was forced to wear a horn ring that nullified her magic. Still, depending on how well she behaved, she was allowed to get at least a bit of her magic back.

As an alicorn and a former princess, Twilight was extremely valuable as a slave, which caused her to get sold off for a very high price; not anyone could get her, only the highly wealthy. Which kind of human ended up buying the conquered element of magic?