I read these stories every night and especially love the brother-sister or sister-sister experiences, and here's one more!
These events occurred over several years. My sister is about three and a half years younger than me, and we have always been very close. We used to play school when we were little, and 'at school' when we were bad we were sent to a private closet. Once there we would sit very close together, and I started by reaching out and rubbing my sisters crotch. She would respond by opening her legs further. Then I would reach in her pants and rub her little pussy through her panties. She always seemed to enjoy it, laying back with her eyes closed. I had no idea exactly what I was doing and doubt she ever orgasmed, and she didn't touch me at those times. It would still get me excited and give me a good hard-on!
We continued this for a couple years, and as we got older, me about 14 or 15, her in junior high, I found the true joy of masturbation, and looked for opportunities to masturbate in the bathroom with my sister's panties from the hamper. I would smell the lovely scent of her pussy and even taste the crotch as I stroked my cock! My sister and I shared a bathroom, and many times we would find ourselves in there together, and would lock the door then start taking each others clothes off, one piece at a time. She seemed engrossed at the bulge in my underpants as she removed my shorts. Of course it was caused by my removing her pants and top. Seeing her like that in her bra and panties would cause a great erection! She could barely wait for me to unclasp her bra so I could see her young developing breasts, with beautiful brown nipples! Then she would yank down my underpants and my cock would spring up at her face! She would be intrigued by the way it grew so fast, and in a jerky way. When it was a full raging hard-on she would always love grasping it in her hand and slowly jack it up and down. She never let me touch her pussy except through her panties, so I made sure they were wet and full of her pussy juice so I could smell them later that night! She never jacked my cock all the way off, but enjoyed watching me do it in front of her.
We are still very close, however we haven't done anything like this since we were little. I am waiting for the right time to bring it up in conversation again to see what will happen.....