Virgin at 69
I never thought that could exist. Long ago - I was 14 and my sister 11 when we started making out with one another. There was an old lady who was sitting us, when mom and dad were out. We knew her for years and I have to confess, she's a better cook than our mom. I don't know how it started but maybe looking at a youth-magazin where always have been posted letters about puberty-problems. So what. My sister and I showed one another naked and I touched her and she touched me. If we read something, we did not know, we talked about and looked what it feels like. And just when we discovered oral sex and after I had done it to my sister and she started taking my cock in her mouth, this old lady came in my room and caught us. She was shocked and she started crying standing in the doorway. We both hugged her and told her that it's right, we have been naughty but that we did not do anything agains the law. OK, we know for a long time, that the lady was more a simple charakter. Some one told us, she has been abused at a very young age. But we got real curious when she told us, she never had seen someone doing what we did. she certainly not did anything like that. Over the time we talked to her, we understood that she never has had sex. Not a little bit. She knew, what "sex" meant, but she told us, that as a child someone had harmed her in a sexual way and that she culd not remember, what he had done to her. She never was married and never had an relationship with another person. We could not believe it. And then she asked, what we have been doing and why we did that. We tried to explain it to her but it's complicated without demonstrating. Wa asked her not telling it to our parents and then showed her, what we did. she sat beside us with wide open eyes and mouth. I licked my sister until she came and then she started sucking my cock as we had read it in the magazine. the Lady sat there with a highly red face and watched each movement. After that day we visited her nearly each afternoon after school because she let us do what we wanted and no one could catch us "in flagranti". She was curious like a little child. After a while she let me touch her (quite big) tits and she touched my cock. I just had her ready for my cock, when she was runned over by a car and died. Still sorry for her. She must have died unfucked! My sister and I often talk about her, when we are alone.
OP: right you are!
This is a typical trope...well written fantasy to promote incest.