I had found some vasoline in a box that hadn't been unpacked yet and started right away to grease up my cock, and start stroking. I was kneeling over a towel on the couch. The towel had a picture of a woman in a revealing bikini, and was the best source of "porn" i had at the time. As i kept stroking, faster and faster, I slightly opened my eyes as my head was turned, and saw my step-mother watching, wrapped in only her robe. I quickly drived to shove my erection into my boxers and sit down. I didn't look back and hoped she had left. But , within a few minutes she walked in and sat on the couch, she turned and looked at me......