My Sister was over again and we were outside discussing her relationship with her son. I still could not believe that her and her son were having sex. She tried to talk me into trying it but I was not sure about it. I went in to shower and when I came out of the bathroom, she was blowing my son. I was kinda mad but really turned on at the same time. I then joined her. We sucked his balls and licked his shaft until he was rock hard. Both of us took turns sucking his cock. Aunt Scarlett wrapped her huge tits around his young cock and fucked it until he was ready to blow. We then double sucked his cock until he shot a massive load all over Scarlett and my face. We then kissed the cum from each others faces and cleaned up his cock with our tongues. Things will be different now.