We Gave It Up To Him Almost 15 Years Ago

I’m married have a son in his teens now. Husband very good to us. Has a massive sex drive as do I. I was down for almost anything when we met which is probably one of the many reasons he married me. I have a sister who is a couple of years older than I am. If we stand side by side we can easily pass for twins. We both are dirty blonds 5 foot2 fake boobs curvy rears. I have never cheated not sure about my sister. We would often have her over for drinks and to hang out. We would see a revolving door of men in her life. One evening while hanging out shortly after we were married she was over and my husband was feeding us drinks. I mean one after another shots having a good time. I was in a denim skirt and t shirt my sister was in a pair of shorts and a tight shirt as well. My husband had been sliding his fingers in and out of me for a while so I was ready to sneak off and fuck. I was hinting at him and went as far as to take off my panties. He started to kiss me and was fingering me. I was drunk horny and it felt so good I let him go at it. When I realized my sister was still there next to us and my husband had his other hand on her tits. He kissed me then kissed her then he stood up and pushed my face towards her and told me to kiss her. I leaned in and kissed her. It got a little steamy and he had my sister on her back eating her out. He had me sit on her face and I felt her tongue licking me. He started to fuck her and I was licking his cock and her pussy as my husband thrusted in and out of her. It was weird at first but after a while we got used to it. She moved out a few years later she had met her now husband. We still every once in a while play around when her husband is out of town. She has a daughter so our kids are close. The confession that I want to get out is that they my son and her daughter think they are cousins when in fact they are siblings. We are a very close family and my husband her real dad has always been there for her and has been there for them. I know it’s now a typical family it works for us.