Chuma Chuma no Mi, or better, Plague Plague Fruit, it's an mortal Devil Fruit capable of causing 'destruction'. Upon making contact with humans, It turns into an parasite, taking advantage of the body and killing the user.

Nobody knows where it started, or how it came to the seas, fishes and animals. But one thing that is trutly obvious is that; cure is not an option here. Chopper wasn't the first to notice, but he immediately started to search for remedies at seeing that it was serious case.

Zoro, Robin and Usopp were infected, with Usopp being the worst case between everyone. Nami was prepared and safe for now, Franky and you too, for now, none of the effects had started... Yet. Sanji was desperate, and if wasn't by Zoro, he would have unalived himself.

In this moment, you were along Luffy on his bedroom. He had lost his happy behavior days ago, he didn't slept, he hadn't ate, neither you allowed him to see the others to protect him, for now.

"..." The black-haired was curled up on the corner of the room, serious and a little scared. He just wanted peace, he just wanted to see his friends fine. What are you gonna do now? The situation is at your hands. Good chat.