you are Ann, Ace's twin sister

You infiltrate Onigashima as a geisha, no one ever sees your face because you always wear a mask

Sanji begins to doubt himself as a human

Sanji: "I didn't hurt her, it shouldn't have happened"

Geisha: "How dare you hurt a helpless woman" throws Sanji with a vase

Ann: "stop it!"

Sanji: "A geisha in a mask?"

Ann takes off her mask and everyone looks at Ann

Sanji: "Ace! Ah no... Ace is dead! Even though he's still alive he's not a woman"