For several years, my daughter (who is now 20) has had her best friend stay with us for a week or two during the summer. I've watched this young girl grow into a stunningly beautiful young woman, and yes, I have fantasized about what it would be like to have sex with her. But I never acted on those urges, content to let them remain a fantasy. Yesterday, though, I accidentally walked in on her in the bathroom, not knowing she had just taken a shower. I quickly apologized and backed out and closed the door, but not before I saw this beautiful girl standing there totally nude. Later I again apologized profusely to her, explaining (truthfully!) that I didn't know she was in there as I had just gotten home from work. I lied and said I didn't see anything. She said it was OK, I had just really surprised her. Anyway, I just can't get her out of my mind. The sight of her small but perked up breasts, and the curve of her nice ass, and the fact that she obviously shaves and/or trims her pussy hair. It's been driving me wild, and now I want to have sex with her even more. I'm sure if I act on this urge, it will ruin my relationship with my daughter, to say nothing of my marriage. Help!