I should be studying for my exams but what the hell, it's a Sunday. This is set at the Thriller Park arc where Zoro honors his broken sword. In my perfect world, Brook has left Zoro to give him a private moment with his sword and Luffy chooses that moment to look for his First Mate.
When the straw hat pirate finds his First Mate sitting before his broken sword, he sobers. Though it is not obvious like everything else when it comes to Zoro, even if Zoro is sitting tall and proud like always, even if Zoro looks up at him with his usual indifference, Luffy knows. And as his Captain, and his best friend it's Luffy's job to cheer him up.
"If I ever die," The straw hat pirate declares as he sits beside the older teen. "I wanna die like Yubashiri."
If it had been another day, Zoro might be mildly surprised at the fact that his Captain even knew the katana's name, or might tease the Devil Fruit user that rubber cannot turn to rust and crumble. However today, Zoro simply asks.
"By my side?"
"Yup," Luffy claps his hands twice and bows his head in honor of the broken sword as he thanks the sword which has, for a very long time, done what Luffy hopes he will never stop doing. "Fighting beside you."