Me and my sister have always gotten along very well. It was like we were destined to be sisters and by fate we are. We did everything together growing up and had no secrets we couldn't or didn't share with one another. I was dating this slightly older guy when I was 17 that my parents didn't approve of because he was 24 in the military on a base near our house. Well my sister helped us see each other without us getting caught and she even drove us around while we made out in the backseat so she had a bird's eye view of our sexual exploits and he was endowed nicely which we talked about often. I was falling for this guy then I find out he has a g/f already which is why we never went to his place so I knew he was just using me but never told him I knew about the g/f. Well me and my sister hatch this plan to get his ass caught but before we did we'd make his life hell by wearing him out sexually. We told him we wanted to share his big cock and he was elated at the idea and he held up pretty good but finally we got him and he couldn't get it up and couldn't fuck her either which got her questioning his faithfulness. After him being impotent for 3weeks we unleashed our plan to expose him to his g/f who is pregnant. We got him good. We took him swimming with our gay friend and we were all having fun and had another friend bring his g/f down to where we were and told him we were moving in a week to California with Jason our gay buddy and we all wanted to have the best sex ever with him and he agreed,which I was surprised he didn't object to Jason not even once and to my surprise as well. He always wanted to suck another guy's dick,omg this was just too easy. We're all having fun and he has attacked Jason's uncut dick twice and our other friend has his g/f in the woods watching this whole thing and it upsets her soo much that she never confronts him and just wants to be taken home and goes back to our friends car but she comes down to us and signals that his g/f has seen all this and that's when we tell him about her being there and he's confused and doesn't believe us and grabs his stuff and checks it out. He was mortified and worried about ppl finding out he was a dirty cocksucker. I cared about him a lot and felt some guilt for being soo devious but I got over the guilt when he started telling her we were just some whores that tricked him into an affair,that's when I started firing back I was HIV positive and it served him right for playing me. Thanks sis.