Anything where a father touches or thinks of his daughter inappropriately is incest and it is wrong. Where is the girl's mother? How old is she? On the other hand, maybe she just has a twisted mind and that's it. Jack Ketchum and Stephen King write some of the best horror stories, but does that mean that Ketchum really tortures kids in basements or King really turns into a killer clown at the end of the day? Most likely not.

This situation is very weird though if he did abuse her don't think he'll ever tell you though. But if you know something, it's your duty as an adult to tell the proper authorities whether he is a friend or not. If she has been sexually abused, she won't just "get over it" she will be scarred for life and she needs help-as much and as fast as she can get it.

I'm hoping it is my second excuse and she just has a twisted mind.

EDIT: I just read your question over again and what disturbs me is: "...he feels incest might be wrong" MIGHT BE are you kidding me? IT IS WRONG "Though he says he's HIGHLY horned by this damned discovery of Marie's fantasy" What sane,innocent,non preverted man would even question what to do in a situation like this? It's like you are asking what should he do if the daughter ask to live out her story with him If he is not a pedophile, he will say "HeLL NO Marie!" Anyway, if he did sexually abuse his daughter, there is a special place in hell for him.

Please go to www.drphil.com and look up the recent episodes when he had a grandfather on the show that molested his own daughter and then his own grandson(the same daughter he molested's son) Catch the next show and see how devestating being abused can be on someone the show had me in tears it was so sad and horrible.

If he never touched his daughter OK fine but something is just not right here in my opinion.