Young boy from the neighbourhood

I am 34 and we have been married for 15 years. Up until last year he was the only man I ever had sex with. He was out of town on business and I had a flat tire in our driveway. I was standing and staring at it when this teenage boy that lived down the street pulled up and offered to help. I had known him since he was just a baby but damn he had grown up! I watched his tight ass as he changed the tire and wondered what was hiding in his jeans?
I had no intention of doing anything when I asked him in for a soda but one thing led to another and son we where in bed. He was so firm and hard! And he was huge compared to my husband who is 45 and out of shape!
He finished and we just laid there. I didn't even feel guilty until the phone went off. It was my husband. As we talked the 18 year old slipped into his clothes and left. Now I screw him once a week and have also been with two of his friends.