Hearing the main door the block of flats I live in, being buzzed open, I knew it was my mother in law. I'd ignored her buzzing my number because I was getting fucked really hard from behind. Then there was knocking on the front door. Letting his huge cock slide out of my arsehole, I got up walked the ten paces to the front door. Opening it, I told Sarah my mother in law I was naked as I'd just climbed out of the shower. She apologized for interrupting me, but wanted to arrange things for this Sunday's barbecue at her house. She began to ask me about what I drank, what food I thought myself her daughter and some of my friends who were invited, might like. Just as I began to answer, I felt a hot hard cock slide between my arse cheeks and enter my rear hole. Stood chatting away half hidden behind the front door to my mother in law, I was being fucked very slowly but oh so deeply. When she finally finished and leaned forwards to kiss me good bye, I was so relieved to close the door. Getting him to pull out, I dragged him back to bed and mounted his cock. I fucked Chris really hard and fast for the next ten minutes, until I jacked off all over his stomach and chest, and he'd spunked his load up my bum. We both laughed and he said "Well it looks like I'll be seeing you and my sister at mums house this weekend for a barbecue".