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My mother’s spots were also not natural–some unicorn vendors in Los Pegasus are paid to put spells on ponies, and before I was born she received the spots as magical tattoos of sorts… and they somehow became heritable. I’m not quite sure how that works; I am not a pony of science.
((I had a lot of fun creating and developing Eagle’s parents for this one! Her mother takes a little bit of inspiration from the Greek god Dionysus, and her father, the Greek goddess Hestia. They’re currently unnamed, though.))