Let's not forget what Luffy unintentionally does to the "cute but huge" mermaid princess before that:
http://mangastream.com/read/one_piece/68833748/17
Aaaaand another one of my fetishes has been portrayed by Oda, I love it! There's just something adorable about a huge busty giant girl that acts like someone a tiny fraction of her size. ^^ Also, I'm not an expert at fish species, but aren't smelt fish really small?