I had finished drawing. The picture a beautiful representation of her body. I told her that I was done, she decided not to put her clothes back on. I twisted the drawing board around and she smiled. I smiled in turn and told her it was an excellent drawing, and she was an excellent model. She blushed. She said it was my turn and I was confused. She emphasized a bit more and I knew. She asked if I was uncomfortable doing so and I told her no. She took a blank piece of paper. sitting there naked made me smile and laugh inside. I stripped down and posed as she started to scribble. I clearly saw her arm move in an outline of my manhood. She glanced up at me and bit her lip. I knew.