Wingcest

Fandom-specific term for Wincest stories where one or both of the brothers somehow acquires wings or has always had them.
Wincest + wingfic = wingcest.

Stories where Sam and Dean have wings have been around since the beginning of the fandom, well in advance of the appearance of angels on the show in Season 4. The wings may be due to one or both of the boys being an angel or some other supernatural being, or due to a spell or curse.

Post-Season Four fics were more likely to cast the brothers as the vessel for the angels Michael or Lucifer.

It is also used to describe pairings between the angel 'brothers' appearing in seasons Four and Five, such as Michael/Lucifer.

See Crack for fanfic featuring Wingcest

See also Angelcest