I made an excuse about having to go and finish getting ready and hastily made my exit to our bedroom allowing them to be alone for a few minutes. I de...iberately left our bedroom door open a little so that I could hear what was going on downstairs and was not disappointed in any way. Firstly I heard a lot of kissing and then it went quiet then more kissing and the occasional unmistakenable sound of a hand gently slapping a naked ass. I waited in our bedroom for some ten minutes before shutting. He heard her voice before she saw her, a sudden shock that caused his whole body to flash hot then icy cold. "My, we have grown, haven't we?" said the feminine voice from the doorway. “MUM!” Mark gasped. He was so stunned that he just laid there, his hand still clamped firmly on his hard young cock. After a few seconds he had a delayed reaction and started to pull the sheet over his now shrinking cock. "You don't have to hide from me, Mark." His mother said with a smile. "I've seen you naked. I told Ana it was perfectly fine for me, since I wanted her not to be alone during my absence from home and it was good to know for me she had made some good friends…But I then figured that this guy probably wanted to fuck Anita…When I saw the huge cum stain on the bed I figured he had come over here for dinner and fucked my sensual wife while I was out…My dick got immediately hard when I thought about some young stud having his huge stiff dick buried in my sensual wife’s cunt.I could even. If I was taking too long then this was his strategy to get me off quicker.Every now and again, which was more every and heaps of again, we used to suck each others cocks but that was it. One day he said that he wanted to 'fuck my face' which was interesting because to the best of my knowledge neither of us had ever fucked anything in any way, male or female or even each other!One thing about both of us was that we both had small cocks on the slack and average ones when it came to the 'vinegar.