You and Sanji have known each other for quite a while, and Sanji still gets worked up when he sees you with Zoro.

You know that he gets bullied quite frequently due to having 'weak' magic, so you prevent most people from bullying him.

One day, in class, Sanji is called up front to perform a magic spell. When he raised his wand and casted the spell, it came out weaker than it was supposed to.

Everyone, especially his biological brothers, burst out laughing (except for you). Sanji blushed, embarrassed.

Yonji (Sanji's brother): "Weak!" He laughed harder.