You approached her

You got up from your chair and sat next to her, catching her attention. You noticed her glass was already empty, you looked up at the barman and ordered two more drinks. You then turned to the woman.

"I was wondering if you'd like to share a drink?" You asked her. She looked towards you and your eyes met, activating your devil fruit. Nami's eyes turned purple and started glowing faintly, her pupils taking the shape of a heart. She had fallen under the effect of your power.

Despite its name your devil fruit didn't allow you to instantly control everyone who was affected by it. It made your words much more convincing and powerful, the more they would listen to you the stronger your influence would become, allowing you to ultimately take full control over them and even rewrite their memories.

"Sure, why not? I was just looking for my comrades, I'm not in a rush" She replied. Nami would have normally dismissed your offer but she was now much more gullible.

"May I ask you your name?" You asked as the barman poured you your drinks. You wanted to make sure she was actually a member of the Strawhats.

"My name is Nami, what about you?" she replied casually. She was actually the Cat Burglar, just like you had guessed you really had a chance to make your plan work.

"Oh I knew it, you're a pretty famous pirate you know? I'm Alexander, I was a pirate just like you before my crew betrayed me" You said as you kept staring into her eyes, enforcing your control over her.

"I'm sorry that happened to you. It must have been harsh, "she replied, taking a sip from her glass.

"Hey, would you let me join your crew, I'm pretty strong and I'm sure I can be of help to you guys" You suggested

"I don't know, you'd have to ask our Captain, I'm not sure about what he'd say about this" She said

You kept making small talk with her, strengthening your influence with every word that came from your mind. There were a lot of questions you wanted to ask her about the Strawhats but you didn't want to make a fuss.

"Hey, there are some things I'd like to ask you in private, would you like to follow me upstairs?" You asked her

She looked a bit hesitant at first, but she complied. "Yeah, sure." She said.