I woke up in the early hours of the morning and felt something touching my face. Opening my eyes, I saw a dim shape by my bed, but something told me not to cry out. Almost instantly I realized it was my 18 year old son Mark. I'm 36 years old, I had Mark when I was 18 and since his father left we have been a pair. I'm petite with unusually large breasts and Mark is tall and powerful. When we're out together, people sometimes mistake us for a couple.
It was not unusual to find Mark out of his bed in the middle of the night; he had been sleepwalking since he was in his early teens. What was different about tonight was that Mark was naked, standing over me, stroking his erect penis. It must have been the tip that brushed my cheek. As he stroked himself, a drop of lubricant formed on his penis and dripped on my face. Involuntarily, I licked it and tasted his salty juice. In spite of my shock, I tried to stay calm. I knew to wake him suddenly during one of his episodes would shock his system. He would be disoriented and frightened. I lay quietly trying to decide what to do.
The size of his penis shocked me. I had no idea my son was so well endowed. His erection was huge -- perhaps nine inches long -- and the head was swollen and dripping. As I tried to decide how to manage the situation, Mark gave a low groan. "Oh God!" I thought. "He's about to orgasm. If I don't move, he'll do it on me!" I felt myself tense up. I pushed the covers back to exit the bed. The I remembered, I was naked except for a flimsy pair of panties. I didn't want my son to see me in this state, but there was nothing I could do without waking him. I noticed my big breasts were taught and my nipples felt tingly. It was ridiculous, but the situation was exciting me. I could feel myself dampening and my lower lips were swollen. I had a powerful urge to touch myself and before I knew it I had slipped my panties down my thighs.