My stepsister tried to come up with an excuse why she’s sneaking out of the house in the middle of the night. But I saw right thru her lies & she started negotiating with me. I signalled for a blowjob, she was in but I said I wanted more. We moved to the bathroom and I started to fuck her from behind, watching her big ass bounce on my fat cock. She loved every minute of this dirty bathroom deal and even sucked all my cum.