It was an unseasonably warm day. Bobby came home unexpectedly, several hours earlier than normal. He was wearing a T-shirt and running shorts. For the...first time ever I could make out his dick through his light-weight shorts. It seemed quite prominent and I assumed he had if not a hard-on at least a partial chubby.“Oh, hey. Didn’t know you’d be home.“ Bobby looked somehow guilty. He quickly put a tattered notebook in front of his bulging crotch. “I’m usually home this time of day.“ I smiled at. I needed to check it out, so I printed out a hard copy and began checking it with the printed forms Wes had from the actual wind tunnel tests. There were a couple of answers out of order, and one garbled output, but I could tell what I did.Using the work computer, I fixed the three items, and after backing my copies up, did the process again. "Ding." A printed report told me the exact information plus the couple of add on items I put in.Four o'clock. I wonder if Wes is busy. I called. "Wes, if. While I'm just left thinking what the fuck? "I'm your mother, and have lived with you your whole life, I obviously know, but my question is, did I ever come into your thoughts while you played with yourself?" I'm immediately thinking exit strategies. Where's that random doorbell, phone call, tornado, exploding car.. I'm not picky. "Well? Pay up, you lost," she said looking all cocky and popping a pretzel in her mouth. I sighed. "Gross Ma. I usually don't think of people in particular." I half. She shifted herself again, somehow changing how we rubbed each other, and I reached the end of my run. It wasn’t as intense as the orgasms I had the night before, I happily pulled back and sprayed my cream over as much of her breasts as possible.She hummed along as she caught what I offered and then rubbed it into her skin like a lotion she only used on special occasions. Then her humming grew in intensity, her eyes squeezed shut, and she rolled her nipples between her thumbs and forefingers..