Butter is only yellow due to food coloring. If you get natural butter, it is white. Sort of like pink sausages and hot dogs which are naturally grey but food-colored pink.
Who knows.... I still say about that one Cirno pic that she ought to lacated Milkshakes... on topic at least there's no piercings ruining perfectly good nipples.
as OrigamiChimera stated yes it Butter that why i put the Butter tag up.butt someone change it so please before you do something check your facts at the door thank you?