Sanji doesn’t know how he didn’t notice it before, is the thing. Of all the times he has seen Zoro shirtless (in battle, mostly) he just… never noticed. The problem is, once he has noticed, Sanji can’t seem to stop noticing. And neither can anyone else. In which Zoro has a nipple piercing and Sanji has a Problem.

Three inches in front of Sanji's face, Zoro is wearing an expression that could wither stone. "What the fuck," the swordsman snarls, "do you think you’re doing." The remaining logical dregs of Sanji's brain recognize that he's just gotten himself into a pretty dicey situation. The rest of it apparently doesn't fucking care, though, because the absurd line of response he comes up with is to grin right in Zoro's supremely pissed-off face and say- "Well, what was your dumb ass doing?" In which the crew’s plastered, Zoro needs to blow off some steam, and Sanji gets taught a lesson or two.