Back in the late 90s I was on my 20s, still lived with my parents because I worked with my Dad, I was single and my mom was discovering the joy of having two cocks to please her at the same time. I just remember one night, waking up having my mom sucking my cock while my Dad was fucking her from behind. I already had sex with my mom before but I didn't know my Dad knew about it. I guess he knew all along because their plan was having me joining them.