different between twinest vs twincest

English

twine +? -est

twinest

Blend of twin +? incest.

twincest (uncountable)

(chiefly fandom slang) Incestuous sexual relations between twins, or siblings who look very similar.
- 2013, John Lancaster, "When did you get hooked?", London Review of Books, vol. 35, no. 7:
  In the course of one of his climbs, he hears adult voices through a high window, goes to investigate, and comes across Jaime and Cersei energetically engaged in (to use a neologism popular with fans) twincest.

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