It is funny how at the start of the anime we all were like EIKOXKAMURI but when sensei appeared we became EIKOXSENSEI!! i kinda feel sad for Kamuri though lol.
I guess Eiko & Kamuri is more a big sis-little sis thing.
Well, Mayas and Aztecs originally made xocolātl with chile peppers and other spices, rather than sweet (although sweet xocolātl made with honey or maple did exist too).