The earliest memory I have is playing "doctor" with an older girl who lived across the street. I must have been 6 or 7 and I guess she was 12 or so. We started out playing house. I was the child and she was the Mom. I remember her saying "you have a doctors appointment today, we have to give you a bath". She then had me get completely undressed and watched me wash in a bathtub. When i finished I got dressed and she said "Now it's my turn". I watched amazement as she undressed. I had never seen breasts before ( hers were perfect in the way that developing girls are- firm, pointing straight out with hard nipples). When she took off her panties I saw my first pubes. I didn't ven know hair grew there. She pretended to wash as I watched, then she got dressed. So far no touching.
She then told me "OK, now we're at the doctors office. I'll be the doctor". A table became the exam couch and she had me sit down. After looking in my eyes, ears and throat she told me to take off my shirt. With a pretend stethoscope she listened to my heart and lungs, then directed me "stand up". As I stood there, she unbuckled my belt and unsnapped my jeans. I think they pretty much fell to the floor and there I was in tighty-whiteys. Without a word, and with no protest from me she put her fingers inside the elastic waistband and slid them down my legs. This time there was much touching as she played and manipulated me to a little erection. After a bit she had me turn around and bend over. I don't recall her touching my anus, but she did stare at it for a long time.
When she finished, I got dressed and she asked "Do you want to be the doctor?" I'm sure I nodded or maybe just stood there with a stupid look on my face as she undressed. I do remember her saying "you can touch them" which I did. She then laid back and spread her legs apart. When she repeated that I could "touch her", I kind of ran my fingers through her pubic hair. "No, inside". I didn't know there was an "inside", but she grabbed my hand and put it between her legs. I think I stuck out my index finger and poked into her vagina. I remember both of us smelling it.
The appointment was then over and we got dressed.
We moved shortly thereafter, and to tell you the truth I don even remember her name. But I've never forgotten that experience.