Sibling incest

[jain]

I'm looking for novels involving consensual sibling incest. The "consensual" doesn't have to mean healthy or happy by any means; I just don't want books about rape or other sexual abuse by siblings. I've already either read or have on my list ( these books (cut to avoid spoiling anyone) )

and, of course, Flowers in the Attic.

I'm most interested in suggestions for brother-brother or sister-sister incest fiction, but I'm also willing to try recommended books involving brother-sister incest.