Just an erection

What can I say, my grandson was over at our house, we were doing the pool thing and I noticed he had a very erect penis while he was looking at my wife who had a biniki on and her nipplles were hard and erect. I never thought it would happen, but looking at his very erect 4" penis I became very desiring, I had been drinking which I think made me more desiring. I swam up to his erection and touched him from behind, oh it felt so good and made me ever so erect. I pulled my erection out of my suit and placed it on his back as I reached under is swim sit to touch my grandsons erection. I thought I was going to explode. I didn't know what his reaction who be, I just held on to his very hard penis. I was so turneded on, I touched myself and stroked my self until I came. I could see the stringy speam floating in the pool water, as I was cuming I was hold his erection and could feel his erect penis cumming as it jerked up and down. I looked and I could see the white cum from his erectiulation in the water. I was so turned on by seeing his small erect penis, I just never thought my large mature penis would grow and desire to the point I I would reach over and touch his obvious erect penis. Just touching and holding his erect penis turned him on to the point of coming.