[That's a pretty personal question, and Perona looks back at Sanji with uncertainty. It's not like it's any kind of huge secret, but this is essentially telling her story to an enemy of sorts. Sure, he's the the most agreeable of the Straw Hats, but...still a Straw Hat. Perona chews her lip, twiddles her fingers, then just exhales. Might as well just tell him.]

Moria-sama said he liked my skill, and said I could be very useful to him if I joined his crew. I didn't have anything else at the time, and I thought it'd be fun! A royal Shichibukai liked me, and he promised I'd get gold and riches and all kinds of things I wanted...so I agreed to go. Besides, I needed protection, and who better than one of the royal Shichibukai? I'd be safe from the Marines and pirates alike. It was the best option for me. I thought it'd be a lot of fun to be a pirate, and it was! I had everything I ever wanted!

...Until you all showed up and ruined everything. [Huff.]