It’s been building to this, hasn’t it?
When Nick included the scene between Elizabeth and Kara in the Wren books, it put Chris in an interesting spot. Does he decide that what they did was unacceptable, with all the repercussions for him and his family? Or does he decide it’s acceptable, but then deal with the question of whether it’s acceptable for him? Since he’d long ago not had a problem with his daughters having sex with each other, I felt his path was obvious, albeit tortured and slippery sloped.
I’ve also wanted to write a big orgy scene like the BBJB orgy that closed out the Gina series. I find them fun, especially with the taboo elements mixed in.