Sister

I used to creep into my sister's room at night. I was 12 and she was a year younger. I had discovered the joys of masturbation. So I would gently pull back the bedclothes, and rustle up her nightie until I could make out the neat little naked fold of her young pussy. It was exciting to touch it, and at first, that was all I did.
But in due time I became more brazen, and would part her legs and touch her cute pussy lips. 
Then one night, I had just pulled her panties down when I became aware hers eyes were open. I froze.She was completely awake. What seemed like an age passed - she was just staring at my cock. 
Then she took my hand and moved it to her pussy. I took a deep breath and climbed in beside her. She sat up and pulled the nightie over her head. She had hardly any tits, but her nipples stood proud. She knelt astride me and took my cock in her hand, then began to rub it between her pussy lips, using it like a dildo. 
Her little body was squirming with pleasure now, her pussy wet and slippery. The tip of my cock tingled with excitement as it rubbed against her little clit. Soon I could hold back no longer, and sperm flew out. 
We spent the next hour lying together, exploring each others bodies. 
After that, very often she would come to my room.
Later she told me that she had learned how to masturbate a few years earlier from one of her school friends who was having a sleepover with her and had shown her how to rub her clit and explore her pussy.