My Friends Sister

When we were all teenagers his sister had a crush on me, I thought it was funny and would just let her do whatever and try not to encourage it but also not just ignore her. One day when I was like sixteen, she is two years younger than us, I found that impossible to do.
My friend said he had to go to the bathroom, badly, would be a long time if I wanted to take off he would catch up with me later. I told him nothing much to do so see you in a bit, I was just sitting in his room flipping thru a magazine when I hear his sister say Hey in a whisper.
She was standing in his doorway with her shirt up flashing me her boobs, she had nice ones that were like a B cup with large puffy nipples and I just stared at them thinking HOLY SHIT she is crazy. I gave her a thumbs up though not wanting to say anything to loudly then she started walking over towards me with her shirt still up, I turned and faced her as she stood not even a foot in front of me. I brought my hands up and started touching them and she just stood there smiling as I did so, I leaned over kissing and licking them then kissed her deeply saying she looked absolutely gorgeous or something like that anyways. So then this became her thing, anytime she thought it was clear she would show me her boobs or ass and let me touch her.
One day like mid summer I am sitting around the house and hear this knock on the front door, I go over and it is her and I asked her to come on in and what was going on. She told me nothing much, my mom went out with some friends so I told her I was going for a walk. We started kissing and she was naked in like a minute and we were in my bedroom, I had never done anything with a girl to that point with her being my first for everything. I started licking her pussy and was just going completely off instinct and all the lies I had heard and read about sex from friends and porn magazines. Some where in all of it she lets out this gasp saying Go back! Yes, right there keep licking! Good news was she had a huge orgasm from it all. She practically ripped my shorts and underwear getting them off and started sucking on my cock like crazy, I had no idea where she learned to do that but I laid there watching her do it and came, felt absolutely incredible.
We were sort of dating but trying to keep it under wraps as she was afraid to tell her mother about it, one day like three months later I asked her mom if she would be okay with me dating her daughter. She told me yes and I had better be on my best behavior or she would cut my dick off, I believed her and hoped like hell she did not already know the stuff we had been doing.
When I got a car we were always riding around and finding places to make out and give each other oral, a lot of the time she would tell me she was fine and just wanted to suck my cock to make sure I was taken care of as she would put it. We never stopped dating and got married after she graduated high school but I will never forget her flashing me her body right in the house and sometimes her mom was napping in her bedroom. She has always been very sexually fun, still dances and gets naked even today like she is giving me a lap dance and even wants me to stick money in her underwear and bra.