Rain-deer (Topic: Umbrella)
They hadn't even reached this latest island and Chopper was already far from enamoured with it. They were supposed to be approaching a Summer Island yet for the last three days it had rained ferociously and capriciously, nearly always when it was his turn to brace the outdoors and fix something vital broken by Luffy. Winter fur, whilst perfect for keeping out the extreme cold, didn't always serve well to keep out the biblical wet, turning him into a kind of reindeer sponge and leaving a trail of damp wherever he went.
This was bothering Sanji, he could tell. He had seen the twitch in that curled eyebrow as he entered the galley, leaving puddles with hairs swimming in them on all the work surfaces and generally reeking of wet reindeer (or wet venison, thought Chopper apprehensively). He did his best to keep out of his way until he was fully dry but Nami didn't always appreciate him borrowing her hairdryer and there was only so much that towel-drying could achieve.
As Chopper unenthusiastically prepared to leave on the fourth day of the deluge, Sanji thrust something bulky, wrapped in paper, into his hooves and disappeared without a second word. Or even a first word. Puzzled, Chopper tore off the wrapping. Underneath was an enormous umbrella, sturdy, pink to match his hat and with a self-opening catch. Chopper beamed, feeling something strangely squiggly in his stomach. Trying not to think about how much this must have cost Sanji, he ran head-first into the rain to try it out.