I have been masturbating since I was 13. One day when I was 14 I went to my friend's house and rang the doorbell. His sister Mary who was 17 at the time, answered the door. She told me my friend was not home, but to come on anyway as he would be home soon. Mary was wearing one of those tight, stretch shirts that made her boobs and nipples stand out and also showed alot of cleavage. The pants she was wearing were so tight they showed her panty line. She went into another room and I sat down.
Right when I sat down, I closed my eyes, slid my hand down my pants and started to stroke my rock hard cock. At that age it didn't take much to give me a hard on. I was concentrating so hard on whacking my cock that I did not hear her come back into the room until she cleared her throat. I was embarrassed. Mary walked over to me and said 'here, let me help you with that.' She proceded to unbutton my pants, take them off and then slide my underwear off. I took my shirt off too, and found myself completely naked in front of a girl for the first time. I started to stroke my rock hard cock with one hand, while the other slid beneath her pants and panties and started to rub her pussy. I didn't really know what to do next, but Mary helped me along.
She first pulled her pants down, then her lacy, pink, and very wet panties, exposing a very nicely trimmed pussy. She then took off her shirt and bra, exposing her very beautiful, large, round tits with nice, soft pink nipples that were fully erect. Mary then took my hand and began rubbing her pussy with it. As she started to moan, I really got into it. I inserted my fingers into her pussy and began rubbing in and out. She grabbed my cock and started to rub it vigorously. With each thrust of my fingers, Mary stroked me faster and harder. It didn't take me long to explode all over her hand and her tits. I kept rubbing her pussy and brushing her clit every now and then. I rubbed her pussy faster and faster until she exploded in orgasm. Her 'cum' went all over my hand and arm and some even wet my face, cock and balls. I licked off what was on my face and it tasted good.
We both then got dressed in a nick of time before my friend got home. When he walked in we both laughed knowing what we got away with. He still doesn't know till this day!