Helping Hand for My Friend

I was round one of my friends houses and we were doing something on his computer. He was sitting at his desk chair and I was sitting next to him on a stool. We were doing something, I can't remember exactly but I put my hand on his knee. He did nothing. I moved my hand up his leg to his thigh. He did nothing. I moved my hand round to his penis, he did nothing. I felt him getting hard in his pants. He was still trying to concentrate on what he was doing on the computer. I undid his flies and pulled out his cock, he still did nothing. I started to wank him off under the desk. Soon he began to breathe heavily and then cummed hard all over the place. He continued looking at the screen, albeit with a flustered look on his face.