Did I do that?
At 15 I thought I was pretty mature and well developed. Actually, I had a lot to gain and learn. I had a girlfriend for a few weeks and we had messed around with touching her breasts and prolonged make out sessions. She wouldn't let me get under her skirt, though. In retrospect, she was probably right to assert she wanted to keep that for later.
One night after her mother had turned on the back light signaling time to come in from the car, she rose up and brushed my boner. She said, 'did I do that?' Of course I said you always do that to me. I just love our time together. She said that her last boyfriend had said that white stuff comes out of it. I replied that to me its actually kind of a creamy color. She asked how would I know and I said we all jerk off and that's what I have seen. She asked if we all did that and I said we do it a lot and sometimes multiple times a day. I said would you like to see it and she said yes, but not to do anything else.
The next day, I picked her up at school and we went off for a short 'session'. I made sure she wouldn't be freaked out and then dropped my trousers, thrilled at a chance to be exposed. Then I showed her how to grip my hard on and jerk it. Unfortunately, I only lasted about 30 seconds and shot cum all over the place. She was just in awe of the show and asked where my balls were and how it felt.
I have thought of this gift we gave each other 1000's of times since and is one of my favorite memories. She actually went back to and eventually married her 'first boyfriend' and is still married to him. Wonder if she ever mentioned this to him.