I planned to make her an adult from the start, but I needed a justification for why she was an adult while still wearing her childhood outfit (her outfit and hairstyle from Ben 10 are the most iconic and beloved by fans).
So I simply decided that at the beginning she wouldn’t be an adult yet, but all the dialogue and actions would remain within appropriate boundaries until she becomes an adult.
In any case, at the start of the game it will always say, “All characters are over 18 years old,” so it’s just brief context for the demo.