I moved in with my sister who is ten years older than me when I started college to get away from our shitty parents. My sister was all to happy to help and enjoyed the lady time we get to share.I am her break from her husband and two boys. Our parents had shunned her because she became pregnant with twin boys before her and her now husband married. We've been better off without them. When I first moved in with my sisters family, her and her husband were having a "dull" point in their sex life. Now my sister and I have always messed around since I was 15 or 16 and we took this opportunity to do the same. Unfortunately after her husband finding out they had an argument and he said that she was cheating on him and unfair that she claimed another sexual partner. This ultimately is what led up to my sister and I sharing her husband. Now this has been an improvement for the both of them, a plus for me because they both have a high sex drive. This high sex drive would have my sister and I slipping our fingers up each other as soon as the kids weren't around, have him shoving his cock down my throat when she wasn't around. Now that all is not my confession. My confession is much worse.
With all the wild hormone driven lustful sex I was have with my sister, her husband, both of them, and my occasional girlfriend from the bar there was bound to be slip ups. My sister's sons have taken a keen interest in everything. The "oldest" I've actually caught spying on me when I was getting railed out by his father, another time when I was riding the dildo against the glass in the shower. Both times stroking an erection.
Now I've always let my sisters boys use my computer since they will not buy them one. They have used it mainly for looking up YouTube videos and Facebook, occasionally I've caught them looking at porn. The "oldest" though I once found looking at dirty photos I sent to his father and another guy. I caught him stroking at a picture of me riding my dildo. Of course he was caught off guard and tried to make an excuse, but with his track record it was all lies. We both knew it. We both knew he wanted my body. This was the first time I had seen his cock up close and I was shocked. Turns out the son has significantly more girth than his father. Considering the situation and that no one was home I decided to take a chance, in stead of leaving him high and dry with blue balls, I instead slowly stripped for him and that sexy athletes body of his. I went full stripper on him, I talked sexy, I teased him, I let him touch my body, I put these D.Cups in his face. I stroke him here and there and every time made my pussy more and more wet, I throbbed and ached for his thick cock. Soon I would be sitting on his lap grinding his cock hard. I. Oils feel his thick cock swell until he burst letting his entire load shoot up in me and drip down slowly.
After that day we have kept up the occasional powerful lustful and passionate fucking. The terrible part in all of this is. This past weekend we had a rather large party get together event which entailed a lot of drinking. In my intoxicated state, I began to crave that fat cock of my sisters oldest twin son, so I waited till he went inside. Once he went inside I grab his handle and stumbled? To the upstairs bedroom where I stripped of his khaki shorts and went to straight sucking a deepthroating his cock. But something wasn't right, he was long but not as thick as I remembered. He asked me, Aunt XXXXXXXX, I didn't even know you liked me that much! OMG, THIS WAS THE OTHER SON! at that point there wasn't any stopping. I let that handsome young man run my inside through. He was nice enough to not pull out of his aunt.

Yesterday I confessed to my sister that I had slept with her two boys. She smiled and sipped her coffee. She replied, "I know, I do too. I'm glad it's you though versus some diseased whore. I was also the one who told (her oldest) where to find your dirty pictures on the computer. I'm also the one who told him to make advances toward you, both of them actually. I'm glad you enjoy fucking them and my husband." I was dumb founded. She proceed to continue to talk at my lack of words. "Don't act all surprised, we had sex as sisters, we fucked and do fuck the same guys. The boys and I start d having sex at their fathers suggestion hoping they wouldn't go else where, I can't have anymore kids after them, hubbys sex drive is high when it's there but it's not slwayz there and he travels a lot. He wanted to share me with the boys, to me to be taken care of and not find someone else. So the boys and I have been having some real dirty sex for a long time. Sometimes both at the same time, sometimes with them and their father. Now you're part of this group."
I sipped my coffee and just smiled.