[Because every incestuous pairing reads Oprah...]
This couple from Lost was pretty much my gateway ship. Boone and Shannon became step brother and sister when Boone was 10 and Shannon was 8, and Boone’s mom (Sabrina) married Shannon’s dad (Adam).
See a clip from from one of the episodes, and a behind the scenes interview with the cast and crew about Boone and Shannon’s relationship after the cut.
Clip from Season One, Episode 14 of Lost when their relationship is made canon through a flashback scene.
Interesting video about why and how the creators of Lost made Boone and Shannon have a sexual encounter, and Boone’s obsession with his sister.
Check out my tumblr for more stepsibling pairings.