Brook and Sanji had a good relationship. It wasn't that close but Brook was a good listener, especially when Sanji, or any of the crewmates, talked about things they loved. Sanji enjoyed talking to him when it came to things he loved.

Brook, despite being a literal skeleton, was a messy eater when it came to his favorite foods. So when Sanji made his favorite, dango, Brook had some on his face and such. Sanji grabbed a napkin and wiping Brook's face.

"Yeesh. How are you THIS messy?"