Summer vacation turns playful with younger bro, very true!
Let's start by saying my bro and I were each adopted from different families; hence we're not blood related. Anyways my recently divorced mom took my bro and I to the beach for a week one summer when we were in junior high. I remember feeling really bored at the beach one afternoon, so I went back to the cabin to relax. I found some old national geographics and took a bath while becoming oddly aroused while looking at the african tribal women with their floppy naked tits. Seeing their babies nursing made me especially wet.
Feeling horny, I wrapped myself in a towel and went into one of the bedrooms. By this time I realized that my brother had come home and was in the adjacent bedroom. The house was kinda weird in that there was a window between the bedrooms with curtains on each side. Well I noticed that his side was open and he was peeking in at me! I decided what the hell, I'll give him a show. I pulled my curtain open, took my towel off, and showed him my tits and pussy. He showed me his small but rock hard cock through the window, and before long he joined me in my room which we promptly locked just in case mom came home.
He let me feel his penis and rub it between my hands. He fondled my boobs and stared at my wet crotch (he was too nervous to touch). I wanted to make him cum, but I don't think he could at that time. Years later, right after a long term boyfriend broke up with me, my brother said he bet he could fit his fist in my pussy, and I nearly melted at those words. My panties were so wet. He tried really hard and had four fingers in at most. He didn't bother making me cum (or show me his grown up cock for that matter)... But it was hot nonetheless.