Dragons have one scale growing in the opposite direction to all the others at their throat. They dislike anyone touching this reverse scale. Although the dragons are normally do not harm humans, if anyone would touch the reverse scale, the dragon is said to become very angry and kill the person immediately. "I'm his reverse scale? That's new." [It also means host's lover is alike a dragon in terms of stamina.] "But I'm unfuckable." [For host's lover host is not.] "I. Am. Un-fuck-able."