A real girl

Natsu pulled out the notebook

"When Natsu Drangeel says the phrase 'A real girl', Aquarius's body will change to that of a normal human, including the addition of all female sexual organs needed. If Natsu says 'Feisty Fish' her body will return to normal."

Natsu then smiled triumphantly

"I don't like that look..." She said

"a real girl."

In an instant, her fish-like tail vanished, leaving in it's wake two all-natural human legs, a nice, plump ass, and a perfect pussy between her legs.

She looked down in shock

"W-what did you do to me?!" She exclaimed.

"just gave you a human form, that's all. Don't worry, I can change you back. But I wanted access to some particular holes you didn't have" he smirked