I'm 5years younger than my sister. She's well built and quite attractive. We never really had much to do with each other until when sixteen our parents were gone for the weekend. On Saturday I was with a friend all day. He came home with me about 8:30. Jim was in the kitchen and I went to the bathroom. Coming out I noticed music from my sister, Casey's room. I knocked to let her know I was home. No answer so I opened her door. She was laying on her be naked and drunk. I tried to rouse her but she did not respond. I looked at her in amazement and touched her breast. This send shivers all over my body. I then rubbed her pussy and stuck my finger in her hole. Again she didn't respond. Not having had sex, this was too much for me. I left her room and told my friend what I'd done. He didn't believe me so I let him smell my finger. He said he wanted to see, so I took him to her room and opened the door. Jim eased to her bed and fondled Casey. She did not respond other than a slight movement.
Jim had was a year older than me and had told me of having sex with 3 girls. He said I want to fuck Casey. I thought this was exciting and wanted to watch. I thought this would be great to video, which I did. Jim played with Casey's tits and pussy, spread her thighs and mounted her. It was just a few minutes and he pulled out and slid up her body and opened her mouth and came in her mouth and on her face. Casey chocked and started to roll so we got out in a hurry. She never indicated any knowledge about the incident.
This was Jim's and my secret. I watched the video and jerked off many times. I burned another copy for backup. One day, about 5 months later and after my first fuck, Casey and I were teasing and I let it slip I had seen her fucking.
She had no clue, though she was by no means a virgin, what I was talking about. After some effort to get around it, I told her what had happened. She was furious and demanded to see the tape. I showed it to her. She was embarrassed and mad and threatened me. I returned the threat by saying I would show my friends. After some arguing and making no headway in getting me to give her the tape, she changed tactics and wanted to bribe me. As Casey became more endearing I became bolder and finally told her I'd keep the tape to myself If she would give me a blow job. After several more attempts to persuade me otherwise, she gave in. Though it wasn't very enthusiastic, it was enough to get me off, though not in her mouth.
about 2 weeks later I told her Jim had never seen the tape but had asked me about. She gave me another blow job not to let him see it. The next week, I told her Jim really wanted to see the tape but would give her the tape if she would fuck me. She agreed and gave me a pretty good sucking and fucking. I gave her the tape and she thought that was that. She didn't know I had another copy, which I copied again. So one more time I got her to fuck me for the other tape. What she didn't know was I set up a camera and videoed that session getting her to act the aggressor so it looked like she wanted the sex. That led to many more sex adventures. Now, almost 10 years later and we're both married we still have sex about once a month because we both enjoy it so much. Casey even came and fucked me the morning before I got married. What a caring Sis!