The reason for Fiore's misunderstanding was because Fang Zheng had a very serious expression when handing her the ring — well, don't get the wrong idea, it wasn't because Fang Zheng had any ill intentions towards Fiore, but because... strictly speaking, if everything went well, then Fiore would become the first "Magical Girl" developed by Fang Zheng since he became a deity.
Yes, the very first one.
Akemi Homura doesn't count as Fang Zheng's believer; she's just an Enchanted of the Time Dragon, belonging to the Dragonborn.
And Hayate Yagami became a Magical Girl through her contract with the ancient Book of Night Sky from Belka, so she isn't counted either.
As for Sakurazawa Kyoko and Mami Tomoe, although they are Fang Zheng's Magical Girls, they joined halfway through.
Illya, Little Hei, Nanoha, Fate, and Little Sakura were originally Magical Girls.
So, up until now, as the "God of Magical Girls," the first believer developed by Fang Zheng is Fiore.
