My wife had a friend and her daughter stay over on the weekend.
I had seen them last year at Christmas and recall the daughter, Katie, as a flat-chested 12 year old. She is now 13, almost 14 and looks completely different.
Her body has developed into the perfect shape of a woman, only smaller. I was amazed when I saw her.
My wife and her friend were talking about her and I overheard her mother say that she had recently discovered masturbation and was masturbating 3-5 times a day. It was getting to be an obsession to the point that she had taken her to see a psychologist. The doctor told them that it was fairly normal, not to make a big deal out of it, give her lots of privacy, and it would go away.
Later that night, the women had gone out and Katie was watching TV. She was sitting on the sofa and moved down to one end when I sat down to join her.
She was wearing a short demin skirt that looked like a pair of jeans over some white leggings. After a few moments I realized that her hand was on her crotch and that she had inserted her index finger between two buttons on the skirt fly and was obviously masturbating. Soon she closed her eyes and let out a slow sigh when she reached what I assume to be an orgasm.
I was hard as a rock but did not do anything to myself right away. Later on Katie took a bath and when I was sure I would not be seen I went into the spare room where she was going to sleep and looked for the leggings. I found them and a small pair of panties in her suitcase. I sniffed them and wrapped the panties over my cock and had a quick wank, while thinking of Katie in the bathtub, knowing she was most likely masturbating again.
I also sniffed her mother's underwear as well, leaving some semen in both ladies panties. The moms smelt much better, I must say.