I'm reaching out for some help here. I feel very ashamed and confused. The other day I walked in on my son and his girlfriend having sex. I got home early from work and had no idea they'd be there. Shocked he jumped up and grabbed whatever to cover himself up, the girl must've been more mortified then he was. I just gave him that look a mother gives a child when they disapprove of something and walked to the kitchen. All day and night I kept replaying what I had walked in on and found that it was making me horny. It's been a few days now and I find at various point of the day my mind wanders back to that. Embarrassingly enough I even pleasured myself once or twice to the thoughts of what I saw. Making this even worse I even find myself jealous of his girlfriend. Is this normal? My gut tells me absolutely not but since I saw this I have thought about but would never act upon fucking my own son. Now whenever we're in the same room I picture his exposed dick out and immediately want to go please myself. Even when my husband or other children are around. Please tell me how I'm supposed to accept this or better yet how do I stop this from happening? I am so depressed because of this.