Zoro/Chopper if you squint and have a mind not to flee from the thought. Nothing bad though.
Zoro had a head cold. His nose was running, he was coughing, his head hurt and his throat felt like he had the cotton mouth of the worst hangover of his life combined with his esophagus spontaneously deciding to turn into sandpaper.
It sucked. And he had already dripped snot on his swords twice while training.
Usually Chopper didn't mind treating Zoro. He got cut up, Chopper stitched him up, Zoro slept, Zoro got better. It wasn't a problem. But Chopper was quickly learning that a sick Zoro was a different set of problems altogether. An illness couldn't be cured with a few quick stitches (not that Zoro's stitches were ever "few" or "quick") and some rest and food to replenish his blood.
Chopper often wondered how Zoro seemed to have so much blood to spare.
But sick Zoro. That was something else entirely. He refused to stay in bed and would sleep on deck in the wind, refused to eat Sanji's carefully concocted soups, refused to lay off on his training for just a few days so his body could fight the stuff inside it. Zoro, in short, was a horrible patient if what was wrong with him wasn't blindingly clear and dripping red onto the floor.
"My throat hurts." He croaked at the little doctor, sitting grumpily in the sick bay while Chopper went through his symptoms. "A lot."
"Hm." Chopper took a little flashlight and took a look down Zoro's throat. Of course he practically had to stand on Zoro's knees to do it, but he was just doing his job. Completely natural. "Well that doesn't look good..." he murmured to himself and he prodded Zoro's tongue with a wooden stick.
"Eh? What doesn't?"
"OH NOTHING YOU'LL BE FINE! I just might need to cut out your tonsils and your head cold has gotten worse because they're all swollen and catching more germs but you'll be fine, don't worry!" Chopper grinned brightly and hopped back to the floor.
"Cut out my tonsils?"
Chopper nodded.
"Where are they?" Zoro fingered the hilt of his sword. Cutting something would make him better. He liked that idea.
Chopper grabbed a mirror. "Open your mouth!" He scrambled up behind Zoro so he could point them out. "See there?" he prodded at his surprisingly-compliant patient's tongue again. "Those two red things dangling in the back! They aren't supposed to be that red OR that big. So taking them out would be best!"
Zoro nodded, getting a good look at where they were before swiftly drawing Wadou before Chopper could even figure out what was going on in order to stop him. He hadn't witnessed Zoro's precious attempt at removing his own feet, after all. "Right there?" he pointed at the mirror.
"Y-Y-YES!" Chopper squeaked from the wall, where he'd plastered himself to escape Zoro's blade. "WHAT ARE YOU DOING?!"
"Cutting them out." Zoro grinned widely. Something PRODUCTIVE. And bloody. Excellent. It took a bit of maneuvering, but he trusted Wadou. Sandai Kitetsu would seek his life blood if he let it so close to his throat. Wadou was much easier to handle in such situations.
Besides, he was used to having Wadou in his mouth.
And before Chopper could screech at him to stop, it was done. Blood now flowing from his mouth and mixing with the snot form his nose and being generally disgusting.
And then Chopper screeched, yelled and basically berated him in every way possible while treating his now bloody throat before promptly passing out in shock.
Zoro smiled and put him up on the bed instead.
He felt better already.