Let me say up front that our mother is a religious psycho, but that is a distinct improvement over the extremist views she once held dear. She and my dad were once part of some bizarre religious sect that was probably only a few gallons of kool-aid short of a Jonestown-style mass suicide. But when the old man seemed bent on making Jezebel, my then 7 year-old little sister, his next "wife", mom went ballistic and damn near beat him to death with a shovel. Mom was acquitted of wrongdoing when the courts accepted that her "episode" was driven by a need to protect her children from a paternal pedophile.
We moved to another distant rural religious commune where Jez and I were allowed only little bits and pieces of outer-world information once our mom deemed them suitable for our consumption as mom home-schooled us until well into our adulthood when she thought Jez and I to be old enough and wise enough to venture into the sinful world outside the commune walls. And even that didn't happen until we were in our early 20s. Being legal adults didn't mean anything to our mother; we were still treated as children until she decided to grant us "adult" status.
Life in a sexually repressed home, cut off from most of the modern world, isn't always as bad as it seems. Jez and I didn't really have any friends, so we formed a bond that to this day remains stronger than most marriages could ever hope to achieve. One of the things that has kept us bonded is our dependence upon each other for mutual sexual fulfillment.
Yes, you know it as Incest. But to Jez and me, it was our only real ticket to sanity for a very long time.
The very nature of the commune meant that we had to share meager quarters that kept Jez and I in the same bed all the way to adulthood. Mom was confident that nothing was happening or going to happen between my sister and I given her strong religious teachings and threats of us being struck dead in an instant from some god if we dared to engage in "carnal knowledge" with anyone. And truly, until we realized that we had become adults in every legal sense of the word but still not in our mother's eyes, nothing happened.
But the need for human sexual contact has a mind of its own, and sleeping in such close proximity with another sexually blossoming body will generate some pretty basal hormonal and physical responses. Jez and I were taught very early the basics of human biology and sex and pregnancy. Fearing that mom would likely beat both of us with any of the vast array of farming and gardening implements should we ever make the mistake of engaging in true sexual intercourse, we instead focused on simply pleasing each other every other way possible.
Jez and I developed a natural recognition of each other's pleasures and desires. Self-gratification quickly evolved into mutual masturbation as our hormonal need for sexual exploration left us to freely learn of the opposite sex from the other whenever privacy became available, usually when mom had to go into town with some other elders while leaving Jez and me "safely" at home.
It didn't take long for me to learn just how sensitive Jez's nipples were and how much she enjoyed having me suck on her breasts as I probed her steamy vagina with my fingers. She was especially responsive when I would find her little nub and gently roll it between my index finger and thumb while I chewed on her rubbery nipples until she would wrap her arms around my head and pin my mouth to her teat while her body would shudder and her vagina would let loose with a stream of slippery fluids.