I was relaxing, having a cup of coffee, when my step brother arrived, using the excuse that he forgot his watch before leaving for work. Thinking I was his girlfriend, he showed me his erect cock. I began to doubt the situation. Could he really be confused? But I was tempted by the sight of his big penis, and I proceeded to suck it. He realized I wasn t his girlfriend, but he couldn t resist what I was doing to him, and we continued fucking on the couch in various ways without my step sister finding out.