My sister and her friend were 13 at the time
I had suddendly noticed that my sister was developing into a young woman, she had a firm ass and puffy breasts.
One day, my sister brought home a friend from school, mum had left me in charge of looking after my sister and her friend, as she went off to a spa day.
I walked past my sisters room and their was a crack in the door, both the girls were naked. I went in and asked 'what are you doing?', they were shocked, they tried to cover up but it was too late I had seen everything.
My sister said that people at school had talked about 'touching themselves' and 'how great it felt' but my sister and her friend couldn't understand, it didn't feel great.
I said that I would show them how and Abby, her friend volunteered. I placed my little finger over Abbys almost bare pussy, and located her clit, she was wet already, I gently started massaging her clit and then placed a finger into her pussy, she moaned loudly,
My sister then said it was only fair that I got naked too, my sister then masturbated in front of me and Abby.
Abby then asked how boys played with themselves, and I placed Abbys delicate hands over my cock and asked her to move it up and down.
I came more than I have ever come before.
Me, Abby and My sister have participated in more activities since (I'm 18 now), but that's not for Solo Touch.