I have a friend whom I met at the gym. We will meet up every week or so, and go to dinner together, or chat and catch up at a coffee shop. We also play raquetball on occasion. I've also been over to her very nice house, and met her 15 year old daughter. I tried speaking with her, and was struck by how shy and timid she was. My friend just smiled and stroked her head. I was also struck by the fact that she is stunningly beautiful, with long blonde hair and perfect, angelic features, still retaining some adorable baby fat. A few weeks ago I went to her house to pick her up for raquetball. I was wondering if she forgot, usually she calls me beforehand to confirm, this time I called her and she didn't answer. The door was open and I let myself in, which I shouldn't have done, I guess I felt comfortable enough with our friendship to take that liberty. I heard music and noises in the bedroom. It was on the other side of the living room, and the door was open so I was able to peek in. I will never forget what I saw: my friend, nude, sitting upright on the edge of her bed, looking down, covered in a film of sweat, clawing at her breasts, bouncing and thrusting and grinding her hips, moaning and whimpering. I could see her thick bush, and below it, between her legs, a spill of blond hair. I am quite certain she was on top of her daughter. I wanted to do something, to intervene, in fact she seemed to be so rough my first thought was concern that she was hurting the poor girl. But I just couldn't, I was a coward, and I very, very quietly crept out of there. And I just don't know what to do. A large part of me says that it is my duty to report this to the police. But she is my friend, and this would completely ruin her life. And would this really be the best thing for the daughter? Who would take care of her? My friend told me that the man who conceived her lives in europe now, and she has completely lost touch. And in the few times I have seen my friend with her daughter, she seemed to be loving and affectionate, motherly. Would it really be best for the daughter, to have her mother sent to prison? I have thought of talking with her. But what would that accomplish? She might panic, and move. Or she might swear she would stop. But how would I know? Would I check on her? I would be back where I started. In the mean time, I have told her that there is a work-related emergency, and that I've been called back to England. This is plausible, because I really did stay there for work just a few months ago. I stopped going to the gym, and any place I know she goes. All because I know there is no way I could talk to her and pretend I didn't see what I saw. I am not proud of this, it is totally at odds with the good person I conceive myself to be. But, I am bisexual myself, and I feel some arousal when I replay the fifteen seconds or so I saw in my head, wondering if it was happening now, wondering what else happens. I haven't even told my therapist of this, because of my shame, and because I am worried she will demand I reveal my friend's identity, maybe even force the matter legally. So, this is what I am dealing with right now.