Sussy Duck

Zeff himself is not a magic user, but knows his stuff. He can tell there is something unique about his boy. Not quite a magic user, but definitely something not fully human. Zeff knows that he can't teach the boy in the way he truly needs, but that didn't mean he would leave Sanji defenceless. He trains Sanji how to fight, how to cook and how to survive the seas. Zeff hopes it's enough, for his boy to find a true teacher when he chases his dream.

One day a crew of magic users crash into his resturant. One of them takes a liken to his boy, ask Sanji to join their crew. Zeff smiles as they actually grow to like each other. Of course Sanji pretend that is not the case, but Zeff can tell. The Straw Hat kid then fight for them. For the Baratie at her crew. He fights for Zeff and Sanji. He almost drowns and Sanji's shape changes, order to save the kid.

Zeff had a familiar as a son. He should be worried for the boy, but Straw Hat and the others are a good bunch, they will treat Sanji right.

Sanji on the other hand is freaked out. He transformed, so that he could save Luffy. He had only been able to keep it up for about a minute, but he had transformed. He didn't think he was able to do that. He was a failure of a familiar. What the fuck was going on?

The longer he spends time with the Straw Hats, the more he was power he was able to lend them, like a battery. The longer he was able to hold a transformation his crewmates needed. He can never transform on his own, only when needed and only a form they need. The crew always seem apologetic when it happens, not understanding that as a familiar, it feels right to transform like that. Like putting a coat on when it's cold. It was comfortable. It was unbearable knowing that a magic user you lo- liked needed help, but was unable to support them.

It was only when the crew get separated for 2 years, does Sanji learn that familiar don't normally form magic bonds to more than 1 person. They don't normally have multiple transformations. Sanji was an anomaly amongst familiars. It made Sanji question what it felt like being a familiar. Being helpful to his crew had healed some of what he went through as a child. He wasn't a failure of a familiar. Then he found out he was still an anomaly, an experiment gone wrong and he spiralled.

It took a few years, but Sanji eventually learns to live being g a familiar. He learns that he is probably one of the most powerful familiars around, as he was so loved. The love from his magic users, gave him strength, which he happily gave back.