To me, the best stories here are the real taboo stories about brothers and sisters, moms and sons. cousins, etc. Maybe that is because of the taboo factor. Here is my true story.
It seems like every time I read a story here about an aunt jacking off a nephew, or a sister jacking off a brother my dick gets hard. It gets hard because memories of me and my sister come flooding back. We had the experimental time of a lifetime for about a year when I was 16 and she was 15. We both were learning or had learned about the wonders of sex then but at that age we didn't really ave any experience with the opposite sex.
Without drawing this into a long essay, we both expressed our curiosities to each other, about our bodies, how all the sex parts work, what things looked like and felt like, masturbation, everything. We agreed to show each other our bodies upon pain of death if either of us told our parents.
I will never forget the day. Mom and Dad were gone for the day. We always talked about sex when they weren't around. We agreed to show each other our naked bodies. We stood in her bedroom facing each other and undressed. We didn't say much. I guess we were both kind of nervous about doing that. I had an involuntary hardon because this was the first time I had ever stripped with a female.
We stood about five feet apart and studied each others naked body. My dick was wildly hard too. My sister had very nice full breasts for 15 years old, and pretty nipples, and her pussy was very hairy. Women didn't shave them much in those days.
We allowed each other the pleasure of feeling whatever we wanted, getting down for real close looks and so on. It really felt good when she was feeling my hard dick and holding it. We must have spent a solid hour closely checking each other out and asking questions.
Then the subject of masturbation came up. She asked me if it felt good to cum and I told her it REALLY did! She wanted to see how I did it and I wanted to see how she did it, so we did it together on her bed and watched each other. I shot cum all over my own sister's boobs because I didn't think in advance about getting tissues to catch it in. I watched as she fingered her pussy and rubbed her clit until she came. It was awesome.
That whole year when we were alone almost 75% of the time we would smile at each other and say 'wanna see again?' We would strip and watch each other masturbate.
About a year later she fell into puppy love with a guy at school and basically, we stopped fooling around and never did it again.
So, when I read the occasional stories like that my dick goes immediately hard as I remember my sister and I being so totally uninhibited with each other. I am so glad that happened to us. Today we are great friends. We never discuss those days. but I know she has never forgotten.