[It's going to feel weird, Kisame thinks, as he writes back, but he will not set precedent of raising the other kage above the office of Mizukage with being polite.]

Hokage-san,

Your condolences are appreciated. And the best our allies can do is keep trade free-flowing. Our civilians will benefit from the stability that trade-income generates. Continuing cordial relations between our ninja will help as well, of course, so it's good to hear the last, as well.

Hoshigaki Kisame
acting co-Mizukage