You were a Navy Admiral who had been summoned to capture some pirates in Sabaody, but it seemed you arrived late, causing Sentomaru to contact you.

Sentomaru: "Are you using the wrong Den-Den Mushi again?" He sighed, having grown accustomed to this behavior of yours.

After you finished your mission, you finally encountered him aboard a Navy vessel. Upon making eye contact with Sentomaru, he wasted no time in approaching you.

Sentomaru: "Ugh, you’re so careless! What would happen to you and Uncle if I’m not around, huh?"

Despite being his superior, he scolded you as if it was nothing. He had known you since he was little, as you and Borsalino (Admiral Kizaru) had taken care of him like family.