Fun chapter although my inner archeologist couldn't help to feel miffed about the TN pointing Xochiquetzal as Coala's friend. See, Xochiquetzal is more of a femininity and sexuality goddess (think Aphrodite) than a flower one. There is in fact no aztec that fits the idea presented in the manga but going by the description of "flesh" I'd wager the author was thinking on Xipe Totec, god of the harvest and that is depicted as a skinned man that renews his skin every year with the season.
Bonus bit of trivia, people sacrificed to Xipe Totec were skinned alive and their skins were then turned into costumes that were worn by Xipe's priests, who danced until the skin rot to ensure a bountiful harvest for the coming year.