First of all, this was a really well written and deliciously hot fic. The way you wrote it indicated to me that Percy enjoyed himself and could have put a stop to this at any time, so I saw no dub/non-con (and I am sensitive to that since I really don't like to read about it). Secondly, incest (except for twincest, oddly enough) has always been another squick of mine, too, but this was just a lovely read, so you did great in my book. :)
I am sorry you felt the need to put up the post script, but I can see being ultra careful. I m here to tell you that I really enjoyed the story, thought, for what it's worth. I hope you won't let critics get you down.