Fauxcest

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)

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Fauxcest

Fauxcest is the most commonly used term to define the practice of acting as and addressing one's partner during a scene as if they were a family member - "Dad"; "Mom"; "Big brother" - during sex (predominantly BDSM, as it most often accompanies various flavours of CNC).
It's way more common than one may think.

Me and my boyfriend tried doing a Fauxcest scene last night - I didn't think he would've liked being called "big brother" all that much...