that's no onahole on Sazanami's waistline, it's a bottle of lotion/lube
It's an accessory she wears on her in-game art. I thought it was a coinpurse on the skirt from other depictions, but it looks more like a button pinned to the bottom of her shirt.
Excuse me.something the matter?OooOoyodo,I'm late.My apologies...I have to hand over these reports to the admiral...Please don't apologize!?"Slightly Erotic Kancolle" Sazanami and The Admiral