Thank you for the reply. Baby steps seem to be a good start. I, too, worry about her feelings getting hurt. I've known him for fifteen years so I know him pretty well. Even she kind of bounces back and forth between talking and not wanting to talk to him. It's probably the newness factor that keeps her talking to him. I'm fairly sure of what I'm comfortable with, slightly uncomfortable with, and outright not cool with at this point. I'll still keep reevaluating my feelings.
I'm a very rational, logical person so feelings are troublesome.
I'm still trying to grapple with why the thought of the sexual aspect of him and her is so disgusting and threatening to me.
Again, thanks for the reply.