In my old house, I had an old fashion cast iron bath tub. It was a great place to take a soak. I would fill it with steamy hot water and cover my body to my neck.
Once in a while, my wife would come into the bathroom and kneel by the tub. She would reach her hand down into the water and find my cock.
A slow, steady stroke would commence until I exploded. It was always a great rush, and I would shudder and moan my approval.
Then, in silence, she would get up and leave.