A holiday in the religion of Yaoism.
May 10 marks the day of when Uke had been freed by Seme from the
devil, Yuri, and where Uke and Seme had sexual intercourse that had miraculously and illogically made them pregnant with a son,
Yaoi, who would soon become an artist and draw the first ever
yaoi picture. This holiday is known as Hangover.
On Hangover, you give
candy (preferably chocolate) to your lover, whether they're a boy or a girl, and give them a warming hug. This is similar to Valentine's Day, but in May, not February.