Of course, as fans might know already, Blackbeard is the only one in the One Piece world with two Devil Fruits, so it is highly likely that this question is inspired by Blackbeard's abilities.

Oda’s response in the SBS of One Piece Volume 111 is not only a perfect callback to this moment, but also goes to prove that Sanji is every bit inspired by Oda himself, perverted tendencies and all.