I did not mean for it to happen. I would never have anticipated anything like this.My son and I went to a convention together out of town, and when we checked into our Airbnb, we realized that instead of two bedrooms, there was only one and one queen size bed. After some discussion, we decided that we could surely share a bed that the two of us had done so many times before, many many years ago. It would have been no different than that if I  hadn’t lost control of my emotions and sexual urges. I never even thought of him that way. It is just wrong.  I didn’t know until I started to open the door that he had started stroking his cock. I quickly stood back in the doorway so he would not see me. I couldn’t help but touch myself. It was such a turn on. I was so disgusted with myself, but I did it anyway. I don’t know what came  over me, but I walked in anyway I before he could finish. He seemed very embarrassed. I reassured him that there was no need to be. It’s normal and natural an even I, his own mother masturbates.We started to masturbate together, and one thing led to another, and I was slowly teaching him how to have sex. With ME!! I could not control my urges. At the time I felt like I was doing the right thing. I was patient and calm and loving what better way for him to learn.The feeling of passion, and how wrong it all was just made it more amazing. We talked about where he should come, but it was irrelevant. He came inside of me and after I let him watch, his jizz drip slowly out of me.