Years ago when my daughter was in her freshman year in college she was still staying at our home. She had her own room and came and went as she pleased. I didn't have to work until later in the day, so I was home until around 11:00AM.
Donn't know how long it took for me to realize that when I didn't close the bathroom and bedroom door and daughter had two mirrors set just right (which she always did) she could watch me in the shower. Since we had clear glass doors on the shower there was nothing between us but two mirrors. Every time I looked she would be fixing her hair, makeup, or something where she cold watch. So as horny as I was I started jacking off in the shower and she watched all the time. This went on for months and nothing was said, i kept jacking and she kept watching.

further down through the years.....................Now I am 68 yo and daughter is 48 yo. In a phone conversation daughter said she had wanted me to make love to her since she was a teen and she invited me to come. I drove 13 hrs to get there and we fucked for 3 days. Fucked her every way possible. Both loved it plan on doing it again.