My Dirty Little Secret.

Don't ask my why, I have no idea, but my older sister is super religious. She always maintained she would be a virgin when she married, she attended church regularly, and was, all in all a pretty good catholic girl. But all girls have urges, and Anna had a boyfriend. I was sure they did more than hold hands, and being a curious nosey little bitch I just had to,find out for myself.. So, after lots of spying, and even a couple,of,carefully drilled holes in the wall that divided our bedrooms, I learned of Anna's "special time". It would,be spoken of in code often. Sometimes her boyfri no would suggest it, sometimes Anna would. Basically it involved a good snog, with sometimes some touching over clothes, before Anna would go,into her bathroom and come back with a pair of panties which she would give to ear boyfriend. Anna would then sit on her bed, legs open and masturbate with her hand in her panties, while her bf would jack off smelling and licking Anna's panties. Now, that's what gave me a dirty little idea. There were many false starts when it didn't work, but eventually I hit gold. Quite simply, I would wear a pair of white panties for a day and make sure they were really creamy....not hard for me.....then I would take them off and put them in Anna's laundry hamper. This particular Friday night, (Anna is a creature of habit and only ever had her boyfriend over on a Friday) Anna and Jimmy were being quite raunchy and I guessed some "special time" was coming. I scooted upstairs, and took my panties off, placing them on the top,of Anna's hamper, and removing the white pair that were already there. In my room, I saw through one of my spy holes that Anna and jimmy were getting into it. This time, Jimmys hand disappeared under Anna's top and she didn't try to stop him, inevitably the moment came. Anna stood up, went to her bathroom and came back with MY panties. Jimmy took them gratefully, while Anna settled herself on the bed, legs open and delved her hand in her panties. Jimmy got his cock out and began to smell my panties! The eroticism of it almost made me dizzy, he was smelling, kissing, licking and then he held them out in front of him and shot his load right into the crotch where my cunt had been only minutes before. Anna finished and they hugged and kissed a bit more. How I wished I could have swapped the panties back, but I didn't know if Anna would have further uses for her boyfriends cum in what she thought were her panties. When we went to bed that night, I saw Anna strip naked, get the panties, and rub herself off while,licking and sucking them. She had no idea she was sucking her sister! I told you I was something of a bitch back then and I knew Anna wasn't putting out. I made many attempts to get Jimmy to goof around with me, and eventually it paid off. Jimmy fingered me to orgasm one time, and I sucked him off afterwards. Yeah, I know, bit of a betrayal huh? As I said, at 15, I was a bitch. Sometimes, jimmy would dry hump me as well. He loved lying between my legs, his bare cock rubbing on my knickers, while I encouraged him to call me Anna. And on THAT particular memory, I need to go take care of the wetness that has suddenly filled my knickers while I typed this.