Step-son Caught Me at Some Pointe

This just happened last week. I was working from home the other day. My step-son, we will call him Caleb, was asleep in his room and my wife ran off to volunteer at the church. It was about 9 AM and Caleb did not need to get just yet for work and I was a bit bored and horny. I opened my robe and pushed my underwear down to my ankles. I pulled up some porn on my phone and started to rub myself. At some point I closed my eyes and started moaning and gasping having a really good session. Now my son never announces himself but this day he called my name as he was walking down the hall. It was too late. By the time I recognize his voice as coming down the hall, I had reached the point of no return. I ejaculated all over my hand, belly, and legs as my son turned the corner and watched the whole thing.  The only words out of his mouth were “that’s gross” as he turned around and walked away.  I closed my robe and grabbed a paper towel from the kitchen. 

It has been a fantasy of mine to jack off with my step-son but he always turns me down when I bring it up in conversation. I do, however, get to squeeze the cute, teenaged butt every day when he gives me a hug in the morning and before bed.