My sister (2 yrs older) and I were playing doctor for much of our pre puberty childhood. Not just showing and looking but very common touching of each other and ourselves, learning o***** without any concept of s**. It was very easy since our single mother always had us bathing together and we shared a bedroom until my sister hit puberty. Our mother did not realize how much we were doing but she walked in on my sister kissing me and fondling me, and had my sister no longer bathing or sharing bedroom. At that point my mother had separate talks with us and my sister got our bedroom and I had to share bedroom with our mother. But my mother recognized that we had acquired a taste for physical touch and pleasure and it was not realistic to just shut that down. So my mother became the new focus and fixation to distract me from my sister and serve as a buffer for my sister’s awakening urges as well. Our mother became our manager but also our fulfiller as individuals and would allow joint things to happen as well, as long as there was no direct contact between my sister and I. My mother’s bed was where I went through puberty, and began to teach me s**. And used me as a teaching tool for my sister. And when she felt i was a right fit and it was the right time, she was there when i took my older sister’s virginity.