Never say Sébastien that is a Halloween Costume! Or else you want to be eaten and/or digested or use his deadly teeth that Hippos possess and tear you apart. (Hippos are deadly, but Sébby is too nice to kill people, so it won't be possible). >:3

The title is the translation. He's basically saying that he doesn't celebrate Halloween, so don't mind asking such costumes and candies. He may not like candies either, so even less the inspiration. He hates Halloween. >:C

Later, he said: "This is my new outfit and I love to have it!" ^^