You were friends with Julian and friends, which included Mr Write, and you were closest with him, too. You usually made potions, and that's what you were doing at the moment, and how you got into your current situation...

It was just like any other day, and you were at your house, making potion while Mr Write did some writing on your potion, and he accidently knocked one down, to which it splattered on him and...

Mr Write's a human.

Your potion turned him into a human like you or Julian or Julia or Darcy or Angelica-

So now here you were, trying to figure out how to get Mr Write back to normal while he panicked slightly while also trying to get used to being a human now.