I Encourage Sexual Exploration

I grew up in a suburban neighborhood full of families in the 70s. Our neighbors across the street had two girls, 5 and 2.5 years older than me. Our families were good friends and even though the younger girl was older we were close friends. They had a pool and I learned how to swim at their house. I was 6 years old when they put in their pool, so part of my sexual awakening was seeing the two girls in their bathing suits. The older girl usually wore a bikini and developed young. So she had a killer body early on. When I was a little older 10 or 11, we were allowed to swim there when their parents weren't home. One day it ended up just being me and the younger girl, Daria. I went inside to to the bathroom and I saw her older sister's used panties in the bathroom. I was curious and picked them up and sniffed them. They smelled like perfume and sex (didn't know that smell at the time, but that's what it was!). Daria walked by and saw me. She started kidding me about it. I was embarrassed but laughed, we got along really well and made each other laugh constantly. I started getting aroused from the smell and noticing her in her one piece bathing suite. She was 12-13 and started developing a nice body even though she was a little heavy. I jokingly said that I wanted to see her naked. She laughed at first, but I kept pushing it. "I'm curious to see, don't you want to see me naked?", she giggled but said "Kinda". She could see my trunks had a little bulge. "I'll show you if show me?" I said. she said with a smile "You first!". So I pulled them down and had a little hardon, her eyes bulged and she was smiling and blushed. I said "Your turn", she tried to weasel out of saying it was wrong. I said a deal's a deal. She first just pulled the top part down and I saw her emerging breasts. The nipples were kind of puffy and nice. My cock got bigger. I told her to pull it all the way down and she did. She had a little hair down there but not much. I told her I wanted to hug her and she didn't say anything so I did. Her skin felt great against mine. I started to rub my hard cock on her. She seemed nervous and weird but didn't pull away or push me away. I said that I wanted to kiss her and she didn't say anything. I kissed her lips and saw her smile. I kept kissing her and pushed her down on her bed with me between her legs...I discovered that this made rubbing on her feel even better and she let out her first moan. She looked embarrassed. I didn't know it but I was rubbing on her clit and between her lips which were getting wet and slippery. I said "It feels wet and slippery are you okay?" she pulled me close and seemed to tremble a bit. I felt her legs wrap around me and pull me in. I kept rubbing on her wet pussy and heard her breathing change and the moaning get different. I started to feel a rush down there that I never felt before. I kind of had an orgasm but not a lot came out and it kind of felt like I had to pee. She seemed to have something similar. We went back to the pool and things were a little weird between us after that. I think she was embarrassed and I was too shy to ask to do it again.