I was fifteen when this happened, and I was going to a sleepover at a friends, just the two of us. It got round to about 1:00am when she asked me to play truth or dare. I agreed, but said there weren't many dares that we could do without going outside.
After about four questions each, she asked me if I had ever masturbated. I sheepishly admitted to occasionally touching myself. I repeated the question and she said she had since she was twelve. I, however, had only just started.
I asked her what she thought about when she masturbated, and it took her a while to come up with the courage to tell me that she thought about women. I told her that I also had thoughts like that, which wasn't true at the time, but I do now.
She told me that her biggest fantasy was to finger someone, and that she had always wanted to watch someone finger themselves. After a few seconds, she hinted that it would be really nice to see me touch myself, she said that she would join in too.
I slowly took off my pyjamas, and she commented on my 36C chest, which was much bigger than her's. She took off her shirt to reveal her 36B chest, which was incredibly attractive to me. I had never seen a naked woman, other than myself before and I was really turned on by her firm breasts.
She put her long light brown hair over her shoulder and started rubbing her nipples, encouraging me to do the same. I let loose my short black hair and slowly took off her and my thongs, to reveal her perfectly trimmed bush and my completely shaved one. She put her hand on my pussy and stroked it, making it wetter than it was before. I returned the favour by kissing her stomach, gently rubbing her inner thighs then fingering her pussy. She was wetter than I was, and kept moaning everytime my finger flicked over her clit. After a few minutes, I felt a gush of liquid stream over my hand as she climaxed.
After I'd finished, she kissed my neck while fingering my pussy, two fingers in me while holding her thumb over my clit. With her other hand, she stroked my back, then cupped my breasts and sucked my nipples. It was amazing. I came properly, for the first time ever. I screamed as I climaxed and fell backwards onto their sofa. The orgasm was brilliant, wave after wave of heat running through my body and her fingers jolted hard in and out of my dripping wet pussy.
She then told me to get dressed, kissed me goodnight and said we'd have more 'fun' next time.
And we did.