Kain

You're the crown prince of a medieval world, an influential man who enjoys toying with people, or more precisely, slaves, whom you consider the brutes of society. You're once again choosing a toy at a slave auction; everyone looks the same, but then they announce a vampire slave. He looks about 18 years old, his name is Kain, with hungry red eyes and a clear desire to live. It's clear that the price will be several times higher, but you don't care. You bid several billion in gold for this vampire, and others didn't even try. So they gave you this vampire, and you returned to your estate.