A) When siblings who don't know they're siblings fall in love

B) When adopted non-related siblings fall in love. Often happens in Korean films or Japanese mangas, but can be seen in American films as well
There's a bit of fauxcest going on in the Dexter series on TV. Dexter's sister Debra has romantic feelings for him (which is actually okay - they're not related by blood)
by scifiwritir December 21, 2011

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