I'm quite intrigued by this taboo topic due to the fact that while I was cooped up in the hospital bed, my gf lent me her book "Flowers In The Attic", which btw is a great novel.
And the story of that book completely revolved around siblings who developed romantic feelings for one another. What interested me is that it got me to think about how I would react to incest if let's say one of my blood relatives professed romantic feelings towards me. (hopefully not my mom...fucking ew....)