Citations:Blackcest

Noun: "(fandom slang) any ship involving members of the Black family from the Harry Potter series in an incestuous relationship"

 * 2007, Catherine Tosenberger, "Potterotics: Harry Potter Fanfiction On The Internet", dissertation submitted to the University of Florida, page 51:
 * And let’s not forget the small but devoted clutch of Sirius fans invoking the soap-opera law of “We haven’t seen a body, so he isn’t really dead,” who are also happy with the possible presence among the living of Sirius Black’s mysterious brother Regulus, which has cheered (and created) many a Blackcest writer.
 * 2008, Phoenix Rising: Collected Papers on Harry Potter, 17-21 May 2007 (ed. Sharon K. Goetz), Narrate Conferences, Inc. (2008), ISBN 9780615195247, page xiv:
 * When immersed in the Potterverse, she particularly likes darkfic, Blackcest and the giant squid, and enjoys being alternately needlessly pretentious and just plain silly.