I know you do have some psychological barrier to cross. Afterall Olivia is your birth mom. I can arrange it so that if either one of you can't go thro...gh with it at the last minute it will not be too ambarassing for both the mom and the son." I thought it was worth a try. Two days later Mom Olivia arrived alone. My half sister Judy could not come because school term was still on. Uncle Willie could not get away from his job. Dad and Jane were in the City. Mom Kate shared her bedroom with Mom. I bobbed my head up and down his shaft taking as much of him as I could into my mouth. While I had his balls in the palm of my right hand I let my fingers tickle his anus. This brought another groan of pleasure from Dougs lips and I pressed harder against his hole and then the area between it and his balls. You are going to make me come Liz! You want me to come just now? My answer to Doug was to suck his cock more vigorously and grab his ass cheeks in my hands. Doug spread his legs open a bit. "My legs went to jelly as the impact of her words hit home and as she pulled 2 pairs of panties from the pocket of her dressing gown, I felt a bit light-headed."Here and now," she repeated, "I want you to do it, that is my price for silence."She took a step forward, reached out and handed me the panties."Strip off and do it," she ordered.I obeyed, half scared, half excited at her dominance.The last thing to go were my boxer's and strangely I was embarrassed to let Joan see my cock. All the. Like I could really open up to her about anything except my feelings. There were a few close calls when I almost told her but luckily, I stopped myself. Soon it was lunch time. “How about some lunch?”“Sounds wonderful. What did you have in mind?”“How about tacos?”“Sounds great!”“Just don’t hover this time.” I said and we both laughed.“No promises.” And she chuckled. I got the tortillas out and the beef and chicken. I put the beef and chicken on the griddle and the tortillas on the black pan..