Ouran High School Host Club is a manga and anime by Bisco Hatori. The main character is Haruhi Fujioka, who is a schoolarship student at the prestigeous private school, Ouran Academy. While searching for a quiet place to study, she stumbles upon a very popular Ouran Academy Host Club. She incidentally breaks an antique vase, worth a lot of money and she has to repay it by working as a host.
A nice comedy, which basically has elements of BL already :P The members of Host Club are: Hikaru and Kaoru, who are twins and their act for the host club clients is twincest, Honey and Mori, who are also always together and there are Tamaki and Kyoya, who are "the father" and "the mother" of the Host Club. They are probably also the most wanted pair out of all of them, and you can read about this pairing here in the doujinshi work ^^