Little quirks and moments about Zoro that Sanji finds incredibly endearing but won't admit to it so he teases him about it instead:
Zoro's loud laugh that sounds like a dog barking.
The fact that he has the literal entire history of swords memorized, and yet he still has no idea how the water cycle works despite it being explained to him a dozen times. Even Luffy understood it on the third try.
His complete aversion to pimple popping. Seeing it, doing it, makes him gag on the spot. Unfortunately for him, Sanji is very addicted to popping his own and Zoro's pimples...
When he calls spaghetti "sketti" and donuts "festive bagels".
The fact that he can whine about not wanting to be seen getting sick, and yet he'll yell for Sanji to get back in the bathroom to support him like a good boyfriend. Like what do you want!? Do you not want Sanji to see you in your most vulnerable position, or do you want him there comforting you in your most vulnerable position??? 😭 And no. He usually isn't drunk in these moments. Hungover or down with the flu, but definitely not entirely impaired.
How stupidly he giggles and grins at the words butt, boner, and fart.
The silly way his cheeks puff out like a chipmunk when he eats.
The insane way he knows exactly how many jelly beans can fit in his nose. WHY he needed to know the exact amount scares Sanji. The how, not so much. He unfortunately watched Zoro shove jellybeans up his nose to prove his statement to Usopp and Luffy. And yet it only made him fall more for the dumbass.... Yes. Even when he had to help get one bean out of his nose before Chopper found out and killed all four men for doing/encouraging something so stupid.
How easy it is to make him blush and stammer.
His plushie collection he thinks is perfectly hidden away in the crows nest where no one can find it, but in fact both Sanji and Franky have found it so far.
Little quirks and moments about Sanji that Zoro finds incredibly endearing but won't admit to it so he teases him about it instead:
How he sometimes snorts or laughs incredibly loud, with his whole body, bent over or literally slapping his knee.
When he really gets into a topic, he starts to pace and talks with his hands going this way and that.
His novelty sock and tie collection.
The very incorrect way he pronounces squirrel, and when he does try saying it correctly he stumbles and stutters the entire time.
The fact he can do a one handed handstand perfectly, but cannot, even if his life depends on it, pat his head and rub his belly and vice versa at the same time.
His stupid bird calls and enthusiasm to identify birds. The same goes for identifying fish.
The way he mutters and talks or sings to himself while he's cooking or cleaning and thinks no one can hear him.
How he plays with/twirls his hair when he's deep in thought.
He names his jar of pickled foods; pickled beets? More like Samantha. Pickled eggs? That's Gregory. Pickled sardines? Usopp's Ticket To Hell For Making Him Pickle Sardines.
The way he sleeps curled up into a ball.
His memorized knowledge of constellations.
His STRONG denial when he's caught wearing reading glasses, insists that he wasn't wearing them and he doesn't even need reading glasses, what the hell are you on about, his eyes are perfect and they are fine!