Stepsisters swapped for sex after finding each other riding my friend

I had a best friend, and we always share everything. So, when I found out that my step sister and his best friend were having sex, I was shocked. But then, I thought it was kind of hot. I decided to talk to my friend about it, and we came up with a plan. We would swap our step sisters for the night, and let them have sex with each other. It was a little weird at first, but seeing my step sister naked with him made me so horny. I couldn't believe how hot it was. We watched as they fucked each other, and it turned us on so much. We joined in, and it was the hottest thing I've ever seen. It was like a dream come true. We all had sex, and it was the best night of my life.