When I was 13 yrs old, my mom got sick and we had a young black nurse come to the house to take care of her. I had already begun masturbating and was a very horny boy.
I found it very exciting to have a pretty late 20's lady wake me in the morning as I would make sure that I had a morning erection. I would hop out of bed as she got my clothes ready and stand there with a raging hard on in my undies. She would take my undies to wash them and would see me in full arousal. I would shower and cum all over the tub thinking about her, hoping she would walk in and see me.
Whilst she never saw me masturbate, she got to see me with a full erection every morning. At this age this was enough for me. I bet she secretly was aroused seeing a young boy with his penis standing up whenever she woke him.