Having two older sisters was great. I learned a lot about girls (and women) living with them. When I was young (about 5), my sisters and I would play a particular game that we thoroughly enjoyed: we called it Hink-Honk, and we would play it on a bed, in the morning, while still in our bed clothes.
In this game, two would lay opposite each other with their legs raised and feet together while the third would sit on the legs of one holding on to the joined feet and 'ride the horse.' As we got older, and I was about 8 (my sisters were then 10 and 11), we stopped playing this game. I think it was because I was enjoying it so much that I lost control.
The joy of the game for me was that regardless of the position I was in, I could view my sisters' pussies as their nighties rode up their legs. It was an especially good view when I was 'riding the horse,' because the pumping action caused their knees to separate and their pussies to open, revealing the pink insides. I think they also enjoyed the view of my little penis when it appeared in the big fly of my pyjamas.
The death knell for the game came when, at age 8, as I was riding, and I was looking down at my oldest sister, then 11, whose pussy was developing soft black hair. I could see it open and close, and this caused me to have an erection. Now my sisters had seen me naked many times, and they had seen me with an erection, often teasing me about it. This time, however, as I got hard, my cock projected between two sets of feet. I know my sisters could feel it because they manipulated their toes to massage it. Clearly, they were enjoying the control they had over me.
Well, as I was riding, my cock projecting between their feet, looking down with lust in my heart at that beautiful pussy, the rubbing on my cock became too much, and I experienced a dry orgasm. I dropped my feet down, bringing the 'horse' to a halt, I shuddered and cringed as my orgasm swept over me. My sisters knew exactly what was happening, and they just giggled.
Sad to say, that was the last time I got to 'ride the horse.' But it wasn't the last time I got to look at those wonderful budding pussies, because I took every opportunity to sneek a look. It wasn't long after that when I began to ejaculate semen, but that's another story.