Friendly neighbor

My mother had some friends over for coffee. Being a warm day they dressed in light dresses. I came out of my room to get a drink when I seen one of her friends standing by the window. Sun shined through her dress and I could see her silhouette. Looking, my young dick sprang up. Embarrassed someone might see it I went to the backyard.
Standing on the side of the house, I looked around to make sure no one was around, and pulled my pants down. I slipped my hand in my underwear and rubbed my dick. As it stiffened, I looked around again. I pulled them down as well. I closed my eyes and imagined the lady I seen. Fantasizing she pulled her dress up and let me take her panties off. I pulled my balls tight and slid my hand up and down my dick. After a few minutes I felt pre cum run out and drip off my hand. That's when I thought I was going to die of embarrassment. I heard a mans voice say, you shouldn't waste it. I opened my eyes and seen our neighbor standing in his backyard leaning on the fence.